Page 1 Terminal Operation and Maintenance Manual 10/2022 Rev. 1, 3/24 English ©2022-2024 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
Page 2 THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Page 3 Table of Contents Title Page Introduction........................... Contact Fluke ..........................Safety Information........................Product Overview ........................molbloc Flow Elements ....................molbloc-L Flow Element ....................molbloc-S Flow Element....................Specifications ..........................General Specifications..................... Reference Pressure Transducer (RPT) Specifications ........Temperature Measurement Specifications ............. MFC Control Function (Optional) Specifications............
Page 4 Operation and Maintenance Manual Leak Check ........................25 Check/Set Security Level ..................25 Additional Precautions to Take Before Making Flow Measurements .... 26 Short Term Storage......................26 Operation ............................27 General Operating Principles..................27 molbloc Channel A and Channel B ..............27 molbloc-L and molbloc-S Operation..............
Page 5 molbloc® Terminal Table of Contents RS232 Interface ......................136 IEEE-488 (GPIB) ......................138 Commands ........................... 138 Command Syntax...................... 138 Command Summary ....................139 Error Messages......................142 Command Descriptions..................143 Status System ........................189 Status Reporting System ....................190 Maintenance, Adjustments, and Calibration..............192 Product Overview ......................
Page 6 Operation and Maintenance Manual...
Page 7 Product Overview molbox1+S is for higher flows and only supports molbloc-S mass flow elements. A molbox1+ supports both molbloc-L and molbloc-S. Each product reads calibration data from a molbloc EEPROM and measures molbloc upstream and downstream pressure with built-in high precision Reference Pressure Transducers (RPTs).
Page 8 MODES, LEAK TESTING, and SELF PROTECTION functions as well as a GAS PURGE routine. The molbox1+S does not support PRESSURE TRANSDUCER TARING as it does not support molbloc-L operation and does not include a bypass valve to connect the upstream and downstream RPTs.
Page 9 molbloc® Terminal Product Overview molbloc Flow Elements The Product supports these molblocs: molbloc-L (laminar) molbox1+ only  molbloc-S (sonic)  The Product supports molbocs with updated data structures (above 6.00) as well as previous data structures. Premium calibrations and specifications are only available with molbocs at version 6.00 or above.
Page 10 Specifications General Specifications Note Safety and other related specifications are printed in the Safety Information document that shipped with the Product and can be found at www.fluke.com. Vibration Meets MIL-T-28800D Weight 6.8 kg (15 lb) max. 32 cm W x 12 cm H x 30 cm D Dimensions (12.6 in.
Page 11 A700K Maximum working pressure600 kPa absolute (87 psia) Maximum pressure without damage700 kPa absolute (102 psia) Pressure Limits molbox1+S A1.4M Maximum working pressure1200kPa absolute (174 psia) Maximum pressure without damage1500 kPa absolute (218 psia) molbox1+S A2M Maximum working pressure2000 kPa absolute (290 psia)
Page 12 Operation and Maintenance Manual Temperature Measurement Specifications Specifications are for molbloc mounted Platinum Resistance Thermometers (PRT) combined with molbox1+ resistance measurement system and temperature calculation. Range 0 °C to 40 °C Accuracy ±0.05 °C Resolution 0.01 °C The molbox1+ internal resistance measurement system is automatically calibrated with reference Ω...
Page 13 As stability can only be predicted, stability for a specific molbloc and molbox1+ should be established from experience. [3] Measurement uncertainty (accuracy): Maximum deviation of the molbox1+ flow indication from the true value of the flow through the molbloc including precision, stability and Fluke calibration standard measurement uncertainty.
Page 14 All molbloc-L elements are calibrated for N2. Calibrations with other gases are optional. Fluke Calibration calibration capability is not maintained at all times for all gases on all molbloc designations. Check for availability before you order calibrations.
Page 15 molbloc® Terminal Specifications Note Differential pressure values are nominal and may vary by up to 15 % with the actual molbloc used. molbloc-L ranges with low pressure and downstream calibrations are in Table Table 2. molbloc-L Ranges with Low Pressure and Downstream Calibrations molbloc-L Size and Full Scale Flow (sccm @ 0 ºC) SIZE SIZE...
Page 16 Operation and Maintenance Manual molbloc-L ranges with high pressure calibrations are in Table Table 3. molbloc-L Ranges with High Pressure Calibrations molbloc-L Size and Full Scale Flow (sccm @ 0 ºC) SIZE SIZE SIZE SIZE SIZE SIZE SIZE SIZE...
Page 17 molbloc® Terminal Specifications molbloc-L Dimensions are in Table Table 4. molbloc-L Dimensions molbloc-L Sizes [mm(in.)] 5E3 AND LOWER 5E3 AND LOWER 58.50 (2.303) 58.50 (2.303) 16.00 (0.630) 16.00 (0.630) 32.00 (1.260) SQ 32.00 (1.260) SQ 68.84 (2.750) 68.84 (2.750) 19.06 (0.750) 19.06 (0.750) 124.00 (4.881) 124.00 (4.881)
Page 18 As stability can only be predicted, stability for a specific molbloc and molbox1+ should be established from experience. [3] Measurement uncertainty: Maximum deviation of the molbox1+ flow indication from the true value of the flow through the molbloc including precision, stability and FLUKE calibration standard measurement uncertainty.
Page 19 Calibrations with other gases are optional. The list of gases which can be measured by molbloc-S is the same as molbloc-L. Fluke Calibration calibration capability is not maintained at all times for all gases on all molbloc designations. Check for availability before you order calibrations.
Page 20 Fluke Calibration calibration capability may not be available for some of the gases listed, or may be limited to <maximum flow rate listed. Check for availability before you order calibrations.
Page 21 40 mm diameter ISO-KF nipple is supplied with 5E3-S and 1E4-S molblocs. [2] Default connector type is listed. Additional upstream connector options may be available. Contact your FLUKE Sales Representative for details.
Page 22 Operation and Maintenance Manual Side M4 X 0.7 Thread mm [in.] 7.00 (2.276) Deep, 2 PI Bottom...
Page 23 molbloc® Terminal Front Panel Front Panel The front panel provides a 2 x 20 vacuum fluorescent display, a membrane keypad for local user interface and other LED indicators. See Table Table 10. Front Panel MOLBOX1 + MASS FLOW TERMINAL + / - UNIT TARE P &...
Page 24 Operation and Maintenance Manual Rear Panel The rear panel provides pressure and electrical connections for two molbloc mass flow elements, communications interfaces, and the power connection module. Table 11. Rear Panel DRIVERS COM 2 IEEE-488 SWITCHBOX COM 1 DOWN...
Page 25 Make sure that all items are present and have no visible damage. molbox1+ includes the items Table Table 12. molbx1+ Parts List Description Part Number molbox1+ mass flow terminal 3499975 molbox1+S mass flow terminal 3499975 Report of Calibration 3152121 Accessories Safety Information 5597399 3133781 Power Cord (7.5 ft)
Page 26 Operation and Maintenance Manual Site Requirements Install the molbox1+on any stable surface at a convenient height. The front feet can extend so that the Product inclines for easier viewing. The molbox1+ can also be mounted in a standard 19-in rack mount with the optional rack mount kit (P/N 3069903).
Page 27 molbloc® Terminal Installation Initial Setup Prepare for Operation To prepare molbox1+ for check out and operation: 1. Read the printed Safety Information that came with the Product. 2. Remove the plastic caps from the rear panel pressure connections. 3. Remove the protective plastic sheet from the front-panel display. 4.
Page 28 Reference Pressure Transducer (RPT) Overpressure). If using a Fluke Calibration molstic: Install the molbloc into the molstic and connect a gas supply. Follow the molstic instruction sheet or manual. The flow through the molbloc must be in the direction of the arrow engraved...
Page 29 The flow through the molbloc must be in the direction of the arrow engraved on the molbloc. Adapter kits are available from Fluke Calibration to make connections from the molbloc or molstic fittings to other common connector types. Ask your Fluke Calibration sales representative about specific adapter requirements.
Page 30 EEPROM information or might require repair. If the molbox1+ fails to reach the main run screen, service might be required. Record the sequence of operations and displays observed and contact a Fluke Calibration authorized service provider.
Page 31 Troubleshooting prior to contacting a Fluke Calibration authorized service Provider. Leak Check Fluke Calibration recommends leak checking a new Product at start-up to make sure that no internal leaks developed during shipping and handling. See <3Leak Check>. Check/Set Security Level molbox1+ has a security system based on user levels.
Page 32 Troubleshooting: For information on typically encountered start-up and operational issues,  see Troubleshooting. Short Term Storage For short-term storage of molbox1+, Fluke Calibration recommends: Vent the molbox1+ pressure ports.  Turn off the power. ...
Page 33 molbloc® Terminal Operation Operation General Operating Principles molbloc Channel A and Channel B molbox1+ supports two molbloc input channels. The main purpose of this capability is to switch between two molblocs without making and breaking connections, for example, to switch between two ranges. It also allows two molblocs to be used simultaneously (see <4A_B>).
Page 34 Operation and Maintenance Manual Most molbox1+ settings, such as gas, units, and K factor are common to both molbloc-L and molbloc-S operation. Changes made to these settings during operation of one type of molbloc will be in effect when the other type of molbloc is connected. The only setting that exists for both molbloc types, but is stored independently for each type, is the tare value.
Page 35 A350K: 300 kPa absolute (44 psia) molbox1+ A700K: 600 kPa absolute (87 psia) molbox1+S A1.4M: 1400 kPa absolute (203 psia) molbox1+S A2M: 2000 kPa absolute (290 psia) Exposing the molbox1+ RPTs to pressures greater than the maximum operating pressure may damage them.
Page 36 BPR is adequate for measurements to be made. For an estimate of the minimum critical flow at various downstream pressures in gases other than N2, contact your Fluke Calibration representative.
Page 37 molbloc® Terminal Operation Table 13. Minimum molbloc-S Critical Flow (slm) in Nitrogen at Various molbloc-S Downstream Pressures N2 Minimum molbloc-S Critical Flow [SLM @ 0°C] With molbloc Downstream Pressure Of: molbloc-S ≤5 kPa 10 kPa 25 kPa 50 kPa 100 kPa 110 kPa 125 kPa 150 kPa...
Page 38 Operation and Maintenance Manual 1. <*> Ready/Not Ready indication; <*> when Ready (flashes if Re number of the flow exceeds 1 300), < > (increase) or < > (decrease) this indicates the direction of flow rate evolution when Not Ready (see Flow Ready/Not Ready Indication).
Page 39 molbloc® Terminal Operation <=> Current DISPLAY mode is UNIT (see <5Unit>). <D> Current DISPLAY mode is DEVIATION (see <6Deviation>). <F> Current DISPLAY mode is FREEZE (see <7Freeze>). Blank, No character Current DISPLAY mode is CLEAN (see <8Clean>). 7. <DISPLAY MODE DATA>: Information shown depends on current display mode (see [DISPLAY]).
Page 40 Operation and Maintenance Manual 1. <*> Ready/Not Ready indication; <*> when Ready < > (increase) or < > (decrease) indicates direction of flow rate evolution when Not Ready; <P> when BPR is higher than choking limit. (see molbloc-S BPR Limits).
Page 41 molbloc® Terminal Operation Manual Operation molbox1+ offers the optimum balance between simple, intuitive operation, and the availability of a variety of functions with a high level of operator discretion. The operator interface is through the display and a multi-function keypad. Remote operation by RS232 or IEEE-488 interface is also available (see Remote Operation).
Page 42 Operation and Maintenance Manual Push B to execute or move forward in the menu tree.  Push B to move back in the menu tree and/or cause execution to cease or suspend  without implemented changes. Push B repeatedly to eventually return to the MAIN run screen.
Page 43 Set the resolution with which the measured flow and other values are shown. Run the TARE, LEAK CHECK, PURGE, and AutoZ functions. The option to TARE is not available in a molbox1+S. Show the current pressure measurements (first push). Show the current molbloc temperature measurements (second push).
Page 44 Operation and Maintenance Manual Principle Frequently, when you test or calibrate a flow-measuring device, it is not possible to flow the gas with which that device will normally be operated (the process gas). This may be because the process gas is toxic, corrosive, or because it is unavailable. When the process gas cannot be used for calibration, it is common to use a different gas to test or calibrate (the calibration gas).
Page 45 molbloc® Terminal Operation Operation To enable a gas conversion factor, push from any run screen. The display shows: K Factor? 1on 2off If <2off> is selected, no conversion factor is applied. If <1on> is selected, the next screen is: K Factor: 1.00000 Edit the gas conversion factor as necessary.
Page 46 Operation and Maintenance Manual The gas characteristics include: gas density under standard conditions  change in gas density with pressure and temperature  gas viscosity under standard conditions (when needed)  changes in gas viscosity with pressure and temperature ...
Page 47 molbloc® Terminal Operation Note <Butn> identifies Butane in molbox1+ because the chemical symbol for Butane (C4H10) has more than the 4 characters used by molbox1+ to abbreviate gas identifications. Mixtures of known gases in known concentrations can be measured by calculation and use of the ADJ function (see <3ADJ>).
Page 48 Operation and Maintenance Manual If multiple calibrations are available for the selected gas arrow keys <> display after the pressure. Use the left right arrow keys to select the other calibrations. He, HI 5.0 slm STD 50-550 kPa <>...
Page 49 Users who do not have the W value available can use the Fluke Calibration free Unit of Measure Converter software utility or COMPASS for molbox or COMPASS for Flow calibration software to calculate W from measured pressure, temperature, and relative humidity.
Page 50 Operation and Maintenance Manual Note If an incorrect value of W is entered (for example, with any non-zero W value while flowing dry air), an error is introduced into the air flow measurement. W, humidity ratio, is different from relative humidity.
Page 51 molbloc® Terminal Operation If multiple calibrations are available for the selected gas, arrow keys <> show after the pressure. Use the left right arrow keys to select the other calibrations. N2 , HI 5.0 slm STD 50-550 kPa <> If the selected gas is not specifically calibrated on the molbloc, a secondary menu shows that indicates that the default calibration for the molbloc will be used to derive the flow of the selected gas.
Page 52 Operation and Maintenance Manual [UNIT] Purpose - To specify the flow unit of measure in which molbox1+ shows measured flow values. Principle molbox1+ calculates the mass flow of various gases in kilograms/second [kg/s]. molbox1+ also supports conversions to a variety of other flow units of measure. The UNIT function allows you to select the flow unit of measure shown on the display.
Page 53 molbloc® Terminal Operation Note If the MFC Control option is active and the MFC profile selected is NOT #1 or #2 (see [MFC] (Optional)), the molbox1+ flow unit is automatically the unit specified in the current MFC profile (see [MFC] (Optional)and <5MFC>) and the UNIT function controls the unit used for displays of MFC set and measure values.
Page 54 Operation and Maintenance Manual Volume flow depends on the actual temperature and pressure of the flowing gas at the point where volume flow is measured. Generally, this point is not at the molbloc, it is at another point in the flow system (for example, at the DUT). At another point in the flow system, it is likely that the gas pressure and temperature are different from the gas pressure and temperature at the molbloc.
Page 55 molbloc® Terminal Operation Standard units (sxxx): The s prefix indicates standard. Volumetrically based mass flow  units preceded with the letter s (for example, sccm, slm, scfh) define standard conditions as pressure of 101.325 kPa absolute (14.6959 psia) and temperature of 0 ° C (32 ° F) and take into account the true compressibility of the flowed gas.
Page 56 Operation and Maintenance Manual Note Volumetrically based mass flow units, including user units (uxxx) and perfect units (pxxx), are discussed further in Volumetrically Based Mass Flow Units. Volume Flow Units (vlm) Note Mass Flow vs. Volume Flow before you use volume flow units. Volume flow is sometimes referred to as actual flow.
Page 57 molbloc® Terminal Operation The next screen is to edit the volume flow pressure in the current pressure unit of measure. Push B to accept the edited value as the volume flow pressure and returns to the MAIN run screen with the selected volume flow unit and gas temperature and pressure active Volume unit gas pres 101.325 kPa...
Page 58 Operation and Maintenance Manual Table 16. Available Flow Units <1std> <2user> <3perfect> <4vlm> <1mol/s> <1ulm> <1plm> <1ccm> <2kg/s> <2uccm> <2pccm> <2lm> <3mg/s> <3ucfm> <3pcfm> <3lh> <4slm> <4ucfh> <4pcfh> <4m3h> <5sccm> <5um3h> <5plh> <6cfm> <6scfm> <6pm3h> <7cfh> <7scfh> <8slh> <9sm3h>...
Page 59 The purpose and operation of the tare function is different for molbloc-L and molbloc-S operation. It is described separately below for the two modes. The molbox1+S does not support the ability to tare as it does not support laminar molblocs.
Page 60 Operation and Maintenance Manual Principle Consider the molbox1+ TARE function as the equivalent of the zeroing function performed on many instruments prior to making measurements. molbox1+ calculates the flow through a molbloc-L from the differential pressure across the molbloc. The differential pressure across the molbloc is measured by taking the difference in the absolute pressure measured by the two molbox1+ internal RPTs.
Page 61 molbloc® Terminal Operation Operation Note At a minimum, do the TARE function whenever the operating pressure of the molbloc is changed significantly, at the beginning of each test, or any time a significant zero error is observed. For best results, it is possible to tare before every reading since taring can be executed while flowing.
Page 62 Operation and Maintenance Manual D - The flow that corresponds to the current untared differential pressure in the current flow units. This display allows the current untared absolute pressures and the resulting untared differential pressure from the difference of the two absolute RPTs to be observed. The flow value represents the current untared zero error in terms of flow.
Page 63 To check the molbox1+ RPT absolute pressure readings by comparing them at a common molbloc-S upstream absolute pressure. Note that the taring function is not supported by molbox1+S. Principle When you measure the flow through molbloc-S, the critical pressure measured by molbox1+ is the molbloc upstream pressure.
Page 64 Operation and Maintenance Manual Figure 6. molbox1+ Internal Pneumatic Schematic- Taring Channel A, molbloc-S Operation 1. Channel A High Isolation: molbloc molbloc Open FLOW FLOW 2. Channel A Low Isolation: HIGH LOW HIGH LOW Closed 3. Channel B High Isolation: Closed 4.
Page 65 To purge the lines between the molbloc and the molbox1+ and the internal molbox1+ volumes of one gas with another gas by setting up a molbox1+ valving configuration in which gas flows through the molbox1+. The purge function is not supported by molbox1+S. Principle molbox1+ supports the measurement of flow of a variety of gases.
Page 66 Operation and Maintenance Manual The PURGE function facilitates purging the molbox1+. PURGE sets up the molbox1+ internal valving so that flow can pass through the molbox1+ (see Figure 7). In this configuration, the lines between the molbloc and molbox1+ and the molbox1+ internal volume can be purged by flowing the new gas in the normal flowing configuration.
Page 67 molbloc® Terminal Operation The purge time can be edited. Push B to cause molbox1+ to set its internal valving to the purge configuration (see Figure 7) and go to the PURGE display: 202.347 kPaa 202.311 PURGING 15 sec A - The current pressure read by the upstream (left) and downstream (right) RPTs in the current pressure unit of measure.
Page 68 SYSTEM LEAK CHECK or other troubleshooting means. Fluke Calibration recommends to run the MOLBOX LEAK CHECK after it has been shipped or if you suspect that the molbox has been exposed to a large shock or liquid or particulate contamination.
Page 69 molbloc® Terminal Operation The next display shows: 347.458 kPaa 307.455 40.003 <ENTER> A - The pressure read by the upstream transducer (left), the downstream transducer (right) and the pressure unit of measure (middle). B - Indicator that the figure that follows is differential pressure. C - Differential pressure across the molbloc in current pressure unit of measure.
Page 70 Operation and Maintenance Manual Figure 8. molbox1+ Internal Pneumatic Schematic - Leak Check molbox Channel A 1. Channel A High Isolation: molbloc molbloc Closed FLOW FLOW 2. Channel A Low Isolation: HIGH LOW HIGH LOW Closed 3. Channel B High Isolation: Closed 4.
Page 71 If any other prompt appears, repeat the process. If the leak check fails consistently, note the failure message and contact a Fluke Calibration authorized service provider (see the warranty at the start of this manual). Leak Check System Purpose To leak check the external system that is connected to the molbox1+.
Page 72 Operation and Maintenance Manual Operation - molbloc-L Operation Note The pass criteria is relative to the molbloc being used. If you use a 1E1-L or 5E1-L for system leak checks might result in false failures due to inability to maintain static pressure stability.
Page 73 molbloc® Terminal Operation Note For systems with mass flow controllers (MFCs): Most MFCs are not intended to provide a complete gas shutoff and so they may not be suitable to close off the test system. If an MFC is downstream of the molbloc and its downstream port is open to atmosphere, it is best to close the system by connecting a cap to the MFC outlet fitting or by connecting a shutoff valve downstream.
Page 74 Operation and Maintenance Manual Push B, the molbox1+ valves actuate to set up the system leak check configuration which is identical to the normal operating configuration (see Table 11). The display becomes: 347.592 kPaa 47.583 0.101 sccm A - Pressure read by the upstream RPT (left), the downstream RPT (right) and the pressure unit of measure (middle).
Page 75 molbloc® Terminal Operation Select <2view> to see the test results screen (see below) with the results from the most recent leak test. To run the leak test, select <1run>. molbox1+ actuates internal valves to connect the upstream and downstream RPTs together, so they both measure an equal system pressure (see Figure 10).
Page 76 Operation and Maintenance Manual Note For systems with mass flow controllers (MFCs) Valves in most MFCs are not intended to provide a complete gas shutoff and so they may not be suitable to close off the test system. If an MFC is downstream of the...
Page 77 RPT zero between full recalibrations. W Caution To assure operation within measurement uncertainty specifications (see Reference Pressure Transducer (RPT) Specifications), Fluke Calibration recommends that AutoZ be run (the value of P updated) whenever offset molbox1+ his exposed to temperature changes exceeding ±15 ºC (36 ºF).
Page 78 The pressure at which AutoZ is done is normally atmospheric pressure and the P std,0 value can be supplied a) by manual entry, or b) automatically from a Fluke Calibration RPMx Reference Pressure Monitor. : The absolute pressure reading of the RPT, with no AutoZ offset, at the time AutoZ ...
Page 79 AutoZ in absolute measurement mode is a gas operated piston gauge (such as a Fluke Calibration PG7601) applying an absolute pressure near atmospheric pressure to the molbox1+ test port.
Page 80 Operation and Maintenance Manual Select <3edit> to edit the values of P  offset Note The value of P is always shown and entered in Pascal (Pa). offset Select <4run> to run the AutoZ routine which determines and activates P values by ...
Page 81 AutoZ. std,0 Select <1Entry> to enter the value of P from the keypad. std,0 Select <2COM> to read the value of P automatically from a Fluke Calibration RPMx std,0 connected to a molbox1+ COM2 communications port.
Page 82 DO NOT open to atmosphere unless a quick connector stem is inserted. Use a quick connector stem (Fluke Calibration P/N 3068652, equivalent to Swagelok SS QM2 S 200) supplied with the molbox1+ accessories to open the port to atmosphere.
Page 83 Run AutoZ by COM2 AutoZ by COM2 allows a Fluke Calibration RPMx Reference Pressure monitor connected to the molbox1+ COM2 to act as the AutoZ reference (source of P ) (see <4AutoZ>, Principle). The std,0 RPMx is read and the new P is calculated automatically.
Page 84 Operation and Maintenance Manual If molbox1+ is able to communicate with an RPMx on its COM2 port, the display shows: 96.7715U 96.7778D Pstd,0:96.7752 A - Real time reading (without head correction) of upstream (1, Hi) RPT in unit of measure on line 2.
Page 85 molbloc® Terminal Operation Note The <5BPR> menu selection is only present during molbloc-S operation. Principle molbox1+ uses the back pressure ratio, or BPR (the ratio of the molbloc-S downstream absolute pressure to the upstream absolute pressure) to determine whether the flow through the throat of the molbloc S Venturi nozzle is critical and flow measurements within predictable uncertainty limits can be made with molbloc-S (see molbloc-S BPR...
Page 86 Operation and Maintenance Manual [P&T] (Pressure and Temperature) Purpose - To provide continuous display of the pressures measured by molbox1+, the Reynolds number of the flow through the molbloc, the temperature of the molbloc and other pressure measurement information depending on whether the molbox1+ is used with molbloc-L or molbloc-S.
Page 87 molbloc® Terminal Operation molbloc-L Operation Operation Push from any run screen. The display shows: 97.788 kPaa 97.783 DP 0.005 0.02 A - Pressure read by the upstream RPT (left), the downstream RPT (right) and the pressure unit of measure (middle). B - The current differential pressure in the current pressure unit of measure.
Page 88 Operation and Maintenance Manual molbloc-S operation Operation 259.312 kPah 99.5769 BPR 0.38 Re 11039 A - The current pressure read by the upstream (left) and downstream (right) RPTs and the current pressure unit of measure (middle). In BPR OFF or Auto modes, tare is automatically applied to these readings.
Page 89 molbloc® Terminal Operation [DISPLAY] Purpose - To select the information shown on the second line of the display. For example, Averaging. Principle molbox1+ supports a variety of ADVANCED FLOW MEASUREMENT functions that are shown on the second (bottom) line of the molbox1+ display. In summary, the available DISPLAY functions included are: RATE: Calculates and shows the current rate of change of flow in current flow units/...
Page 90 Operation and Maintenance Manual FREEZE: Captures and shows the instantaneous flow value measured by molbox1+ when you push (see <7Freeze>). This function records the flow present at the time of an operator observed trigger event. CLEAN: Blanks out the second line of the display (see <8Clean>). This function is used when a simple display of flow measured by the molbox1+, without additional information, is necessary.
Page 91 molbloc® Terminal Operation Note See [DISPLAY], Principle. Operation To activate the RATE DISPLAY push and select <1rate>. Selecting <1rate> returns to the MAIN run screen with the RATE DISPLAY active. With the RATE DISPLAY active, the MAIN run screen shows: * 101.27 sccm R 0.03/sec A - Standard MAIN run screen top line.
Page 92 Operation and Maintenance Manual The display shows: Averaging Period: 20 s A - Edit field for averaging period in seconds. Default is 20. Minimum 3, maximum 999. Edit the averaging time period if necessary. Push to return to the MAIN run screen with the AVERAGE DISPLAY active.
Page 93 molbloc® Terminal Operation A - Instantaneous flow value at molbox1+ normal integration rate. B - Countdown in seconds until completion of on-going averaging period. C - Current rate of change of flow in flow unit of measure/second. <3 Hi/Lo> Purpose To activate the HI/LO DISPLAY.
Page 94 Operation and Maintenance Manual Note When DISPLAY is set to HI/LO, the MFC indicator of the optional MFC function is not included on the second line of the molbox1+ display as the HI/LO DISPLAY occupies the entire second line of the molbox1+ display (see [MFC] (Optional)).
Page 95 molbloc® Terminal Operation With the TOTALIZER DISPLAY active, the MAIN run screen shows: * 101.45 sccm Σ 0.00 scc 00:00:00 A - Standard MAIN run screen top line. B - Total mass or volume accumulated over elapsed totalizing run time. C - Units of measure of mass or volume (derived from the current flow unit) of the totalized value (see Table...
Page 96 Operation and Maintenance Manual To set a new totalizing time without going back through the menu, push select <2new> from the TOTALIZER screen. To freeze a split total without stopping the totalizing run, push while totalizing (see Viewing a Split Total and/or Starting a New Totalizing Run with a New Run Time below in this section).
Page 97 molbloc® Terminal Operation With the UNIT DISPLAY active the MAIN run screen shows: * 101.27 sccm = 0.1013 slm A - Standard MAIN run screen top line. B - Flow equivalent of the current measured flow in the alternate flow unit of measure. C - Alternate flow unit of measure selected in UNIT DISPLAY.
Page 98 Operation and Maintenance Manual Operation To activate the DEVIATION DISPLAY, push and select <6dev>. The display shows: Target: 100.00 sccm A - Edit field to edit the target value from which the deviations is to be measured. Edit the target value. Push to return to the MAIN run screen with DEVIATION DISPLAY active with the entered target value.
Page 99 molbloc® Terminal Operation Note See [DISPLAY], Principle. Operation To activate the DEVIATION DISPLAY, push and select <6dev>. The display shows: Target: 100.00 sccm A - Edit field to edit the target value from which the deviations is to be measured. Edit the necessary target value.
Page 100 Operation and Maintenance Manual Note When DISPLAY is set to DEVIATION, the MFC indicator of the optional MFC function is not included on the second line of the molbox1+ display. The DEVIATION DISPLAY occupies the entire second line of the molbox1+ display (see [MFC] (Optional)).
Page 101 molbloc® Terminal Operation B - Flow measured in the current flow units when was pushed (displays 0.00 by default when FREEZE DISPLAY first activates. Push to cause the current flow measured by the active molbox1+ range to be captured and shown.
Page 102 Operation and Maintenance Manual [A/B] Purpose - To switch the active molbloc channel between channel A and channel B. Principle molbloc Channel A and Channel Operation to change the active molbloc channel. The currently active channel is indicated by the Push lit RED LED below the molbox1+ display.
Page 103 molbloc® Terminal Operation Operation When you first push , the screen prompts you to select the channel. The MFC channel refers to the channel of the optional MFC switchbox that can be purchased as an accessory to allow the MFC control function to be switched between up to five MFCs. disables the MFC control function.
Page 104 Operation and Maintenance Manual MFC Run Screens When the MFC function is ON, the MAIN run screen is unchanged but <MFC> or <MFM> and the active MFC channel number are shown in the bottom right corner of the molbox1+ display (in RATE, UNIT, and FREEZE DISPLAY modes only, see [DISPLAY]).
Page 105 molbloc® Terminal Operation Push from the second MFC run screen to cause the third MFC run screen to show (this is the second screen if MFC profile #1 or #2 is in use, see MFC Profiles and <5MFC>). + 15.11 V -15.15V S1.020 V 11.29V...
Page 106 Operation and Maintenance Manual Note MFC profiles #1 and #2 are default profiles to work with the MFC function directly in analog units without an MFC flow range or units. Profile #1 is 0 V to 5 V, profile #2 is 4 mA to 20 mA.
Page 107 molbloc® Terminal Operation [Setup] Purpose Push to accesses a menu of commonly-used functions and features that do NOT have direct function keys. These functions include: <1molbloc> To initialize a molbloc when it is connected to molbox1+ and/or to identify the molblocs currently connected to molbox1+ (see<1molbloc>).
Page 108 Operation and Maintenance Manual <1molbloc> <9TEMPU> for detailed information on each SETUP function. Note Some screens (for example, the SETUP menu) go beyond the two lines provided by the display. This is indicated by a flashing arrow in the second line of the display. Push to move the cursor to access the lines that are NOT visible or directly enter the number of the hidden menu choice if you know it.
Page 109 molbloc® Terminal Operation On molbloc EEPROMs, the molbloc is still identified by its nominal range rather than by its size. The identification of the molbloc displayed by , <1molbloc> identifies molbloc-L by both its nominal range and sizing code. molbloc-L size and range designation correspondence are given in Table Table 18.
Page 110 Operation and Maintenance Manual <2stab> Purpose To change the stability limit that serves as the criterion for the flow Ready/Not Ready indication (see Flow Ready/Not Ready Indication). Principle molbox1+ continuously monitors the rate of change of flow through the molbloc to which it is...
Page 111 molbloc® Terminal Operation Note The stability limit value is automatically converted when flow units of measure are changed. setting affects the resolution of the stability limit value. If the stability limit display does not have enough resolution to set the desired value, push to adjust the resolution (see [RES]).
Page 112 Operation and Maintenance Manual Select N , the highest concentration gas, as the molbox1+ gas. Calculate: molecular weight of the mix 28.215 = 1.0071 molecular weight of the gas selected on the molbox 28.016 Set flow multiplier in ADJ function to 1.0071.
Page 113 molbloc® Terminal Operation The ratiometric mode determines the ratio of the flow through two molblocs. This mode provides a convenient, system controlled, method for comparing molblocs to determine the coherence between different ranges. General Operation (Aspects Common to Both A_B Modes) To access A_B modes, push , <4A_B>...
Page 114 Use a common regulator with as little tubing and fittings as possible between the point where flow is split upstream of the two molblocs and rejoined downstream. Standard hardware setups (molstics) for A+B operation are available from Fluke Calibration. Operation To activate A+B mode, push , <4A_B>...
Page 115 molbloc® Terminal Operation A/B Mode Purpose To operate two molblocs simultaneously on molbox1+ channels A and B and display the ratio of their flow rates. Principle In A/B mode, molbox1+ makes measurements on one channel and then the other channel. The individual flow rate measured by each channel shows as it is read and information on the ratio and disagreement between the two channels is also calculated and shown.
Page 116 Operation and Maintenance Manual C -The gas that is being flowed. D -The ratio of the two most recent channel readings (A/B). E - The difference in percent between the two most recent channel readings. Though the optional MFC control functions are still active in A/B mode, the MFC run screens are not available.
Page 117 molbloc® Terminal Operation The display shows: Input type: 1voltage 2current Select the analog signal type of the MFC and push Use the next screen to enter the full scale voltage or current. Enter the full scale voltage of current of the MFC and push .
Page 118 Operation and Maintenance Manual Note The REGE function affects the molbox1+ MFC control function. The MFC control function is an optional feature. If this option is not installed in the molbox1+, the REG function of the SETUP menu is not active.
Page 119 molbloc® Terminal Operation When the regulation mode is active, <R> shows in the bottom right corner of the MAIN run screen (when space is available). <7FLOWU> Purpose To customize the selection of flow units of measure that are available for selection from (see [UNIT].
Page 120 Operation and Maintenance Manual Note The user unit is defined in terms of user units/Pa when the user unit is selected. Pressure for definition of the pressure unit conversions used by molbox1+. <9TEMPU> Purpose To select the molbox1+ unit of measure.
Page 121 molbloc® Terminal Operation To access the SPECIAL menu, push from the MAIN run screen. The display shows: 1reset 2level 3ul 4cal 5prefs 6remote 7drivers 8head 9BPR Select the necessary function. <1reset> <9BPR> for detailed SPECIAL function descriptions. Note Some screens (for example, the SPECIAL menu) go beyond the two lines provided by the display.
Page 122 Operation and Maintenance Manual Select the necessary reset. After confirmation, the reset occurs. A reset puts the molbox1+ through its start up routine as if power had been turned OFF and back ON. See <1sets> through <5all> for detailed information on the specific reset choices.
Page 123 molbloc® Terminal Operation Reference temperature for uxxx units of measure to 0 °C (see Volumetrically Based Mass  Flow Units at Various Reference Temperatures (UXXX)). Volume flow unit of measure conditions to molbloc for temperature and standard  atmospheric pressure for pressure (see Volume Flow Units (vlm)).
Page 124 Operation and Maintenance Manual Note Reset - Cal has NO effect on the reference resistance values used to calibrate molbox1+ internal ohmic measurement system (see OHMIC Measurement [Temperature] System Verification) or on the calibration coefficients for the optional MFC control function (see [MFC] (Optional)).
Page 125 Fluke Calibration recommends that the low security level be maintained at all times and password protection be implemented if control over setting of security levels is necessary.
Page 126 Operation and Maintenance Manual Table 21. Security Levels (cont.) Keys Medium High , (access to menu) , <1molbloc> , <2stab> , <3adj> , <4A_B> , <5MFC> , <6mode> , <7flowU> , <8presU> , <9tempU> , <1reset> , <1reset>, <1sets>...
Page 127 molbloc® Terminal Operation Operation Note molbox1+ is delivered with NO active password so access to the User Level menu is open. The user level is set to <1Low>. User levels can be changed freely until a password has been created. RESET functions (see <1reset>) do not affect the password setting.
Page 128 The factory secondary password is available in case the user password has been misplaced or forgotten. A factory secondary password can be obtained by contacting a Fluke Calibration authorized service provider (see the warranty at the start of this manual). The factory secondary password is different for each molbox1+ and changes each time it is used.
Page 129 For molbox1+ A350K: 315 kPa absolute (45 psia) For molbox1+ A700K: 630 kPa absolute (91 psia) For molbox1+S A1.4K: 1470 kPa absolute (213 psia) For molbox1+S A2M: 2100 kPa absolute (304 psia) The molbox1+ overpressure limits, which cannot be edited, are:...
Page 130 Operation and Maintenance Manual The top line indicates the current pressure measurement of the upstream (left) and downstream (right) RPTs. The bottom line is the over pressure warning. Pressure indications that are grossly out of scale generally indicate that the RPT(s) have been fatally over pressured.
Page 131 molbloc® Terminal Operation <1ScrSVR> Purpose Adjusts the time setting of the molbox1+ SCREEN SAVER function. molbox1+ has a SCREEN SAVER function which causes the display to dim after a key is NOT pushed for a certain amount of time. The default screen saver time activates the screen saver after 10 minutes.
Page 132 Operation and Maintenance Manual The ID has twelve characters. When the edit screen is opened, the cursor is on the first character. Enter numerical values from the keypad. In addition, use to toggle through a list of available alpha numeric characters. Holding the key slews through the characters.
Page 133 molbloc® Terminal Operation Note The molbox1+ date and time are set to United States Mountain Standard Time in the final test and inspection process at the factory. Use the TIME and DATE functions to set your local time and date <6REMOTE>...
Page 134 Operation and Maintenance Manual IEEE-488 The IEEE-488 port address can be defined from 1 to 31. The default address is 10. The molbox1+ sends a line feed (<LF>) and asserts the EOI line at the end of all transmitted messages.
Page 135 molbloc® Terminal Operation Failed communications is usually a due to a cable or incorrect RS232 interface settings. Make sure that these are correct before you conclude that a COM port is defective. <7Drivers> Purpose To control the output signals of molbox1+ 8 channel, 12 V external drivers. Note The <3drivers>...
Page 136 Operation and Maintenance Manual Principle molbox1+ measures absolute and differential pressure in molbloc flow elements. The molbox1+ reference pressure transducers (RPTs) are calibrated with the height of the rear panel pressure quick connectors as the pressure reference level. Sometimes, when a user does a calibration or test, the molbloc is at a different height than the molbox1+ pressure reference level.
Page 137 <9BPR> Purpose Selects the molbox1+ BPR (back pressure ratio) measurement mode in molbloc-S operation. The molbox1+S BPR measurement mode is always on and there is no option to turn it off or use the auto selection option described below. Principle...
Page 138 Operation and Maintenance Manual When the molbox1+ internal valves are positioned to connect one RPT upstream and the other downstream of the nozzle to determine BPR, the valve state is referred to as BPR ON (see Figure 12). Figure 12. molbox1+ Internal Pneumatic Schematic -molbloc-S Operation, Channel A, BPR 1.
Page 139 <5BPR> (molbloc-S Operation Only)). Operation Accesses the BPR mode menu, push , <9BPR>. The display shows: BPR mode: 1BPRoff 2BPRon 3Auto On a molbox1+S, BPR is always on. The menu does not provide a selection. The display shows: BPR mode: BPR ON...
Page 140 Operation and Maintenance Manual Making a BPR mode selection, activates the selected BPR mode and returns to the previous RUN screen. Push returns to the previous RUN screen without changing the BPR mode. Select <1BPRoff> to cause the molbox1+ internal valves to immediately switch to the BPR OFF...
Page 141 molbloc® Terminal Remote Operation Note It is possible to change the BPR mode by remote communication with molbox1+ and also to disable molbox1+ valve control and switching while in any BPR mode (see molbox1+ commands. It is not possible to operate A_B modes when the active BPR mode is Auto due to internal valving conflicts.
Page 142 The molbox1+ LabVIEW drivers are an abstraction of the remote commands into a consistent set of common and specific instrument functions. The drivers can be obtained at no charge from the Fluke Calibration web site. RS232 Interface To establish RS232 communications, a standard pin to pin DB-9F to DB-9M RS232 cable must be used to connect the host COM port to molbox1+ COM1.
Page 143 molbloc® Terminal Remote Operation COM2 The molbox1+ COM2 RS232 interface is on the rear panel. The interface is a 9-pin female DB-9M connector configured as a DTE device. Data is transmitted out of the molbox1+ on pin 3 and is received on pin 2.
Page 144 Operation and Maintenance Manual IEEE-488 (GPIB) The molbox1+ IEEE-488 interface is on the rear panel. The physical and electrical interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE Std. 488.2-1992. Do not attempt to communicate with the IEEE-488 interface while using the COM1 interface. The IEEE-488 receive buffer is 250 bytes deep.
Page 145 molbloc® Terminal Remote Operation Command Summary Table 25. Command Summary Syntax Purpose *CLS Clears the status registers and all queues. *ESE(?) Read or set the Event Status Enable register. *ESR? Read the Event Status Register. *IDN? Identify the Product and software version. *OPC(?) Read or set the Operation Complete register (not applicable to the molbox1).
Page 146 Operation and Maintenance Manual Table 25. Command Summary (cont.) Syntax Purpose Read the next flow measurement. Read the results of a completed flow averaging cycle. FUNIT(=) Read or set the flow display unit. GAS(=) Read or set the gas type being used.
Page 147 molbloc® Terminal Remote Operation Table 25. Command Summary (cont.) Syntax Purpose SS(=) Read or set the stability required for a Ready <*> condition. STDRES(=) Read or set the PRT measurement system auto-calibration reference resistor values. TARE Read the current tare conditions and the current tare. TARESETUP(=) Prepares the unit to tare.
Page 148 Operation and Maintenance Manual Error Messages molbox1+ always replies to a command. If the command is incorrect or contains invalid data, an error number is returned in the form ERR# n where n is an integer number that represents a specific error.
Page 149 molbloc® Terminal Remote Operation Table 26. Error Messages (cont.) Reply Description ERR# 30 Fatal mass flow calculation error ERR# 31 molbloc EEPROM is full ERR# 32 molbloc gas not found ERR# 34 molbloc is write protected ERR# 35 molbloc write error ERR# 36 MFC unit mismatch ERR# 37...
Page 150 Operation and Maintenance Manual IEEE Std. 488.2 Common and Status Commands The molbox1+ supports a set of commands that are common to all instruments that conform to IEEE Std. 488.2 protocol. Though defined by the IEEE-488.2 standard, they also apply to molbox1+ RS232 (COM1) communications.
Page 151 molbloc® Terminal Remote Operation ∗ESE(?) Purpose Read or set the Standard Event Status Enable Register. Syntax “∗ESE n” “∗ESE?” Parameters ’0 to 255’. This is the decimal representation of the bit(s) to enable. To enable the PON and QYE bits, the argument would be 128 + 4 = 132.
Page 152 RPT serial numbers and the software version. Each is separated by a comma. Query Reply The version string. Example Command: “*IDN?” Reply: “FLUKE, molbox1+, 620-84836-85056, Ver6.00-ngmgl” ∗OPC(?) Purpose Sets the operation complete bit when all operations have completed. Syntax “∗OPC” “∗OPC?” Remarks This command enables the molbox1+ to set the OPC bit in the Standard Event Status Register when it has completed all pending functions.
Page 153 molbloc® Terminal Remote Operation ∗OPT? Purpose Reads the list of installed molblox1 options. Syntax “∗OPT?” Remarks This Query returns any registered option(s) installed in the molbox1+. Each option is separated by a comma. Query Reply A comma delimited text field of the installed options. Example Command: “*OPT?”...
Page 154 Operation and Maintenance Manual ∗SRE(?) Purpose Read or set the Service Request Enable Register. Syntax “∗SRE n” “∗SRE?” Parameters ‘0 to 255’. This is the decimal representation of the bit(s) to enable. To allow the MAV and ESB bits to assert the SRQ line, the argument would be 32 + 16 = 48.
Page 155 There is no other reply from this command. Prior to using this command, you must ensure that the molbox1+ COM2 port is correctly set up to communicate with the device. Refer to the “COM2=“ command. Example Command: “#VER” Reply: “FLUKE, molbox RFM Ver1.20”...
Page 156 Operation and Maintenance Manual ABORT Purpose To stop an active averaging, tare, purge, leak check cycle, or reset the list of gas calibrations on a molbloc. Syntax “ABORT” Remarks Confirms that molbox1+ is in a known state. The tare, purge, and leak check cycles put the molbox1+ into a condition where it is not usable for normal flow measurement, so enter the “ABORT”...
Page 157 molbloc® Terminal Remote Operation ALLR Purpose Read the next ready/not ready indication, measurement of molbloc flow, the molbox1+ upstream and downstream RPT pressure values and the molbloc temperature. Syntax “ALLR” Remarks The next available measurements are replied. This can take up to 1 second, since the molbox1+ waits for the next flow measurement before replying.
Page 158 Operation and Maintenance Manual AUTOZERO(=) Purpose Read or set the status of the reference pressure transducer (RPT) AutoZ function. Command “AUTOZERO=n” Query “AUTOZERO” Default “AUTOZERO=1” Arguments ’0’ Autozero OFF ’1’ Autozero ON Remarks The molbox1+ “AutoZ” function can be turned ON and OFF. This command sets the AutoZ status for both of the internal RPTs.
Page 159 molbloc® Terminal Remote Operation Purpose Read the MFC measurement current if in ‘mA’ mode. Syntax “CIN” Remarks The optional MFC interface can measure current output of an MFC. The molbox1+ must be in ‘mA’ mode before this can be done (see the “MFCCH” command).
Page 160 Operation and Maintenance Manual DATE(=) Purpose Read or set the internal clock date. Syntax “DATE” “DATE=yyyymmdd Arguments yyyy: The year from 1980 to 2079. The month from 1 to 12. The day from 1 to the last valid day of the given month.
Page 161 molbloc® Terminal Remote Operation DEVICE(=) Purpose Select to use the ‘A’, ‘B’ or both the ‘A’ and ‘B’ molblocs. Syntax “DEVICE=n” “DEVICE” Arguments Device: ‘A’ to select molbloc A. ‘B’ to select molbloc B. ‘A+B’ to select molbloc A and B in A+B mode. ‘EXT’...
Page 162 Operation and Maintenance Manual Purpose Read the differential pressure value used by molbox1+ to calculate flow. Syntax “DP” Remarks The molbox1+ has upstream and downstream absolute RPTs. The pressure returned by this command is the differential pressure value that is being used by molbox1+ to calculate flow.
Page 163 molbloc® Terminal Remote Operation Purpose Start a single flow averaging cycle. Syntax “FA=period” Arguments period: The averaging period in seconds (from 20 to 999 seconds if A+B mode, otherwise 4-999 seconds). Remarks Starts an averaging period that results in the average molbloc flow, MFC measurement, and standard deviation of the molbloc flow over this period.
Page 164 Operation and Maintenance Manual Purpose Read the next measurement of flow through the molbloc as calculated by the molbox1+. Syntax “FR” Remarks The next available flow value is read in the current flow units. This can take up to 1 second, since the molbox1+ waits for the next flow measurement before replying.
Page 165 molbloc® Terminal Remote Operation Purpose Read the results of a completed flow averaging cycle. Syntax “FRA” Remarks This command is used to check on the status of or collect the results of an averaging cycle that was started earlier using the "FA=" command. During the averaging cycle, this command will reply "BUSY"...
Page 166 Operation and Maintenance Manual FUNIT(=) Purpose Read or set the unit of measurement for the flow through the molbloc as calculated by the molbox1+. Syntax “FUNIT=unit” “FUNIT” Defaults “FUNIT=sccm” Arguments unit: The flow unit used to display the measured flow.
Page 167 molbloc® Terminal Remote Operation GAS(=) Purpose Read or set the gas type being flowed through the molbloc. Syntax “GAS=gas “GAS” Arguments gas: Specify the gas to use. Remarks The calibration for the gas type being flowed through the molbloc is specified using this command.
Page 168 Operation and Maintenance Manual GASCAL(=) Purpose Read or set the active molbloc calibration to use. Command “GASCAL=gas (, calname)” Query “GASCAL” Default “GASCAL=N2” Arguments gas: Calibration gas. calname: Calibration name (optional. Same as gas assumed if blank or ignored if molbloc does not have named calibrations) Remarks A molbloc can contain multiple calibrations, possibly for each gas.
Page 169 molbloc® Terminal Remote Operation GASCALS Purpose List out the calibrations in an active molbloc. Query: “GASCALS” Remarks All of the calibrations in an active molbloc created with molbox version 6.00 or greater can be listed one at a time using the GASCALS command. You MUST first send the ABORT command to “reset”...
Page 170 Operation and Maintenance Manual ID(=) Purpose Read or set the user defined identification label. Syntax “ID=string” “ID” Default “ID=NONE” Arguments String: An alphanumeric string up to 12 characters wide. Remarks The user defined ID label can be used to allow the user to “tag” the molbox1+ with a unique identifier.
Page 171 molbloc® Terminal Remote Operation LEAKCK(=) Purpose Starts a molbox1+ or system leak check cycle or checks if a cycle is complete. Syntax “LEAKCK=type” “LEAKCK” Arguments type: “BOX”. Starts a leak check cycle on the molbox1+ internal circuit. The molbox must be prepared for the leak check by setting pressures and venting ports before the leak check is executed.
Page 172 Operation and Maintenance Manual Errors ERR# 6: One of the arguments is not invalid. ERR# 15: A leak check cycle has not been started. ERR# 46: A large leak exists. ERR# 47: The temperature changed too much to test for a leak.
Page 173 molbloc® Terminal Remote Operation MFCCH Purpose Read or set the MFC channel and output mode (voltage or current). Syntax “MFCCH=channel,mode” “MFCCH” Defaults “MFCCH=1,v” Arguments channel: The optional MFC switchbox channel. disables the MFC interface. enables the optional MFC interface. 1 to 5 selects the MFC channel to use for optional MFC switchbox mode:...
Page 174 Operation and Maintenance Manual MOLBLOC Purpose Read the active molbloc header data. This command does NOT load molbloc information into the molbox1+, it only accesses previously loaded information. Syntax “MOLBLOC” Remarks The external molbloc header data includes the serial number, range, calibration date, and PRT calibration data.
Page 175 molbloc® Terminal Remote Operation OHMS Purpose Read the most recent measurement of the active molbloc’s two PRTs. Syntax “OHMS” Remarks ????? Example Sent: “OHMS” Reply: “109.031 Ohms, 109.037 Ohms” See Also OHMIC Measurement [Temperature] System Verification, [P&T] (Pressure and Temperature), “TEMP” PCAL(=) Purpose Read or set the user RPT calibration adjustments (PA, PM).
Page 176 Operation and Maintenance Manual PCALDATE(=) Purpose Read or set the user RPT calibration dates. Syntax “PCALDATE=yyyymmdd, yyyymmdd” “PCALDATE” Defaults “PCALDATE=19980101,19980101 Arguments yyyy: The year from 1980 to 2079. The month from 1 to 12. The day from 1 to the last valid day of the given month.
Page 177 molbloc® Terminal Remote Operation Purpose Read the next molbloc average pressure. Syntax “PR” Remarks  −  upstream downstream     The next available average pressure value is read in the current pressure units. It is the average of the tare corrected upstream and the downstream transducers.
Page 178 ERR# 7: The unit is invalid. See Also <8PRESU> PURGE(=) Purpose Read the progress of or start a purge cycle. Not available on a molbox1+S. Syntax “PURGE=period” “PURGE” Arguments Period: The period of time over which to purge (1.. 999 seconds).
Page 179 molbloc® Terminal Remote Operation RANGE Purpose Read the range designation of the active molbloc. Syntax “RANGE” Remarks The range designation of the active molbloc is returned in the flow units used to define the range. Note that the effective molbloc range is dependent on the gas being flowed and the molbloc pressure dependent calibration type.
Page 180 Operation and Maintenance Manual RES(=) Purpose Read or set the local flow display resolution. Syntax “RES=n” “RES” Default “RES=0.001%” Arguments Resolution in %FS (1% - 0.001%) Remarks The molbox1+’s front panel resolution can be specified with this command. The resolution of remote flow measurement replies are always 0.0001% FS.
Page 181 molbloc® Terminal Remote Operation REMOTE Purpose Enable remote local lockout operation. Syntax “REMOTE” Remarks A REMOTE command deactivates the front panel. All front panel controls except will be disabled. The REMOTE command can only be canceled by a LOCAL command or by turning OFF the molbox1+ power then re-applying it. Example Command: “REMOTE”...
Page 182 Operation and Maintenance Manual Purpose Read the next available ready status. Syntax “SR” Remarks The current Ready/Not Ready status can be read directly using this command. If the reply is "NR" then the flow is Not Ready within the limits set by the stability settings, molbloc calibration flow or pressure limits.
Page 183 molbloc® Terminal Remote Operation SS(%) Purpose Read or set the flow stability required for a Ready condition to occur (flow unit/ Syntax “SS=stab” “SS” “SS%=stab%” “SS%” Defaults “SS=0.1 sccm” Arguments stab: The flow stability in flow unit/sec. stab%: The flow stability in % FS of the active molbloc. Remarks The stability setting determines whether the flow is ready or not ready.
Page 184 Operation and Maintenance Manual TARE Purpose Read the current tare conditions and the current tare. Not available on a molbox1+S. Syntax “TARE” Remarks Set the molbox1+ valves to the tare condition (see “TARESETUP”) and check the tare conditions using this command before taring the internal transducers (see “TARESET”).
Page 185 Terminal Remote Operation TARESETUP(=) Purpose To prepare the molbox1+ to be tared and to return the unit to normal operation after a tare has been completed. Not available on a molbox1+S. Syntax “TARESETUP=mode “TARESETUP” Defaults “TARESETUP=OFF” Arguments mode: “OFF”. Allows normal operation of the molbox1+.
Page 186 Operation and Maintenance Manual TARESET(=) Purpose To automatically tare the upstream and downstream RPT or set the tare to a user defined value. Not available on a molbox1+S. Syntax “TARESET=tare “TARESET” Defaults “TARESET=0” Arguments tare: The tare value (-9999 to 9999 Pa).
Page 187 molbloc® Terminal Remote Operation TCAL(=) Purpose Read or set the molbox1+ temperature calibration for the active channel Syntax “TCAL=adder, mult, date” “TCAL” Arguments adder: Temperature adder in the current temperature units. mult: Temperature multiplier. date: Date (YYYYMMDD) Remarks The temperature calibration for active channel is applied to the displayed molbloc temperature.
Page 188 Operation and Maintenance Manual TIME(=) Purpose Read or set the internal clock time. Syntax “TIME” “TIME=hh:mm:m Arguments hh:mmxs: The time to set in the format where hh is the hours from 1 to 12, mm is the minutes from 1 to 59 followed by “am” or “pm”.
Page 189 molbloc® Terminal Remote Operation TUNIT Purpose Read or set the molbox1+ temperature unit of measure. Syntax “TUNIT=unit” “TUNIT” Arguments unit: ‘C’ for Celsius or ‘F’ for Fahrenheit. Remarks The temperature unit is used for reporting the molbloc temperature, and for setting various other temperature settings.
Page 190 Operation and Maintenance Manual UL(=) Purpose Read or set the upper limit for the internal pressure transducers. Syntax “UL=upperlimit” “UL” Defaults “UL=630.00 kPa” Arguments upperlimit: The upper limit in the current pressure units (0 to 500 kPa). Remarks The upper limit sets the point in which the molbox1+ reacts to protect the internal transducers;...
Page 191 molbloc® Terminal Remote Operation UTEMP Purpose Read or set the temperature reference used for the volumetrically based mass flow unit with user defined reference temperature. Syntax “UTEMP=temp” “UTEMP” Defaults “UTEMP=0” (°C) Arguments Temp: The reference temperature in the current temperature unit of measure.
Page 192 Operation and Maintenance Manual VLM(=) Purpose Read or set the volume flow unit of measure pressure temperature conditions. Syntax “VLM=pres(,temp)” “VLM” Defaults “VLM=101.325 kPaa, 20°C” Arguments pres: The user defined pressure in the current pressure unit. Temp: The user defined temperature in the current temperature unit. If this field is omitted, and just the pressure is given, then the molbloc temperature will be used as temperature.
Page 193 molbloc® Terminal Remote Operation VOUT(=) Purpose Send a voltage to the MFC if in voltage mode. Syntax “VOUT=voltage” “VOUT” Defaults “VOUT=0” Arguments voltage: The voltage to be sent to the MFC (0 to 5.5 V). Remarks The optional MFC interface can set a voltage sent to an MFC. The molbox1+ must be in voltage mode before this can be done (see the “MFCCH”...
Page 194 Operation and Maintenance Manual VSUPPLY Purpose Read the current ±15 Volt MFC supply voltage. Syntax “VSUPPLY” Remarks The optional MFC interface provides a ±15 Volt supply. These two measurements are referenced to the MFC supply common, and are sensed in the molbox1+.
Page 195 molbloc® Terminal Remote Operation ZOFFSET:HI(=) and ZOFFSET:LO(=) Purpose Read or set the AutoZ pressure offset (P ) for the high (“HI”) or low (“LO”) offset RPT. Command: “ZOFFSET:HI =offset” “ZOFFSET:LO =offset” Query: “ZOFFSET:HI” “ZOFFSET:LO” Defaults “ZOFFSET:HI = 0.0” “ZOFFSET:LO = 0.0” Arguments offset: The RPT pressure offset (“Poffset”) in Pa.
Page 196 Operation and Maintenance Manual Status Reporting System The molbox1+ status reporting system tracks and reports system status and errors. The status subsystem is layered under and reports to the status reporting system. It follows the model of the IEEE Std 488.2 and works for the COM1 and the IEEE-488 port with slight differences. The molbox1+ can be programmed to respond to various status conditions by asserting the SRQ of the IEEE-488 interface.
Page 197 molbloc® Terminal Remote Operation Each of these status bits can cause a SRQ to occur. The Service Request Enable Register (“∗SRE” program message) determines which of these flags are able to assert the SRQ line. This enable register has a matching set of bits that each will enable the designated bit to cause a SRQ, except for the RQS/MSS bit(s) which cannot cause a SRQ.
Page 198 (see <1tare>). AutoZero of Reference Pressure Transducers (RPTs): Regular rezeroing of the RPTs  absolute measurement mode to a barometric reference standard with the AutoZ function is recommended by Fluke Calibration (see <4AutoZ>).
Page 199 See OHMIC Measurement [Temperature] System Verification instructions. molbloc Calibration: molblocs can be calibrated separately from the molbox1+. Fluke  Calibration recommends a 1-year recalibration cycle. Calibration of a molbloc consists of a comparison of the mass flow measured by the combination of the molbloc and a calibrated molbox to a suitable mass flow standard flowing the gas for which the calibration is being done.
Page 200 Operation and Maintenance Manual Product Disposal Dispose of the Product in a professional and environmentally appropriate manner. If this Product has an integral battery, put the entire Product in the electrical waste. Calibration Of Reference Pressure Transducers (RPTS) Principle molbox1+ has two nominally identical, absolute Reference Pressure Transducers (RPTs) used to measure molbloc upstream and downstream pressure.
Page 201 20 kPa to 600 kPa (3 psia to 87 psia) for molbox1+ A700K;  100 kPa to 1400 kPa (14 psia to 203 psia) for molbox1+S A1.4M;  100 kPa to 2000 kPa (14 psia to 290 psia) for molbox1+S A2M;...
Page 202 RPTs are connected to the CHANNEL A UP (HI) port and isolated from the DOWN (LO) port, but for a molbox1+S the absolute RPTs are independently connected to the CHANNEL A UP (HI) port and the CHANNEL A DOWN (LO) port. Use the quick connector stems (P/N 3068652, equivalent to Swagelok SS QM2 S 200) supplied with the molbox1+ accessories to make the connection(s).
Page 203 molbloc® Terminal Maintenance, Adjustments, and Calibration View and Edit RPT Readings and Calibration Information WCaution Editing RPT calibration information affects molbox1+ pressure measurements and can cause out of tolerance flow measurements. RPT calibration information should only be edited by qualified personnel as part of the calibration process. Caution should be taken to avoid accidental editing.
Page 204 Capability to view and edit the values of the reference resistors used by the molbox1+ ohmic measurement system (see OHMIC Measurement [Temperature] System Verification) is also provided here. This capability is normally used only by a Fluke Calibration Authorized Service Provider.
Page 205 molbloc® Terminal Maintenance, Adjustments, and Calibration W Caution Editing RPT, MFC and/or reference resistor calibration information will affect molbox1+ pressure and/or temperature measurements and can cause out-of- tolerance flow measurements. Calibration information should only be edited by qualified personnel as part of the calibration process. Use caution to avoid accidental editing.
Page 206 Operation and Maintenance Manual Note There is a specific calibration date for each RPT. To change the calibration date of one RPT does not change the other. The value of PA is always in Pascal [Pa]. The value of PA must be entered in the pressure unit Pascal [Pa].
Page 207 If unfamiliar or uncomfortable with the mathematics used for PA and PM manipulation, Fluke Calibration recommends you verify the as left readings as suggested in Step 10 above to provide practical confirmation of the integrity of the calculations.
Page 208 Operation and Maintenance Manual The MFC control function signals are: sense (V)  measure (V or mA)  valve (V)  negative power supply (V)  positive power supply (V)  set (V or mA)  See Section MFC Control Option Connection for complete MFC control specifications.
Page 209 molbloc® Terminal Maintenance, Adjustments, and Calibration Each selection shows the signal adder and multiplier. For certain signals, you must select <1voltage> or <2current>. In this case, there are separate and distinct adders and multipliers for voltage and current readings. <1sense>: Set point sense.
Page 210 Fluke Calibration sales representative [molbloc simulators: 100 Ω (0 °C nominal) P/N 3069694, 107 Ω (18 °C nominal) P/N 3069682, 110 Ω (25°C nominal) P/N 3069701)].
Page 211 molbloc® Terminal Maintenance, Adjustments, and Calibration 4. Repeat steps 1 through 3 for the other simulators and/or for Channel B. 5. If all disagreements between molbox1+ indications and corresponding calculated reference temperatures are less than 0.05 ° C, the ohmic measurement system verification passed.
Page 212 If unfamiliar or uncomfortable with the mathematics used for TA and TM manipulation, Fluke Calibration recommends that you verify the as left readings as suggested in Step 8 above to provide practical confirmation of the integrity of the calculations.
Page 213 The coefficients used to adjust the gas calibration are designated FA (a flow adder or offset) and FM (a flow multiplier or span set). Fluke Calibration does not recommend the use of FA as this is an offset value (% of FS) that could negatively impact the molbloc, which is a % of reading device.
Page 214 If unfamiliar or uncomfortable with the mathematics used for FA and FM manipulation, Fluke Calibration recommends that you verify the as left readings as suggested in Step 10 above to provide practical confirmation of the integrity of the calculations.
Page 215 FLASH memory loading utility along with a file of the molbox1+ embedded software. These are available for download from www.fluke.com. If the embedded software that you use is suspected of a problem, record all symptoms and contact your Fluke Calibration authorized service provider.
Page 216 Contact Fluke. Make sure to have the Product model number, serial number, and regional voltage available to tell the service technician. Identify the symptom or unexpected behavior that you observed from the Symptom list in Table 29.
Page 217 Fuse ratings can be found in the safety information document that shipped with the product and at www.fluke.com. If the fuse blows a second time, it is likely caused by failure of a component part. Front panel keys seem to Remote command has been Operation is normal.
Page 218 FAULT>. that include the numbers shown when is pushed and report to Fluke Calibration authorized service provider. Displays <PRTERR> or molbox1+ has identified an Connect a different molbloc. If <ACALERR>. unusually large disagreement...
Page 219 molbloc® Terminal Troubleshooting Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution Displays <******> where a Number to be shown is too Check settings that may be the numerical value should large for allocated space. cause of an out of limit Usually due to an erroneous measurement and adjust if setting or measurement...
Page 220 Operation and Maintenance Manual Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution Flow indication flashes in Pressure is 10 kPa above the Operation is normal. Indicates molbloc-L mode maximum pressure or 10 kPa that flow is beyond the molbloc-L...
Page 221 molbloc® Terminal Troubleshooting Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution A Ready (<*>) indication is Flow stability criterion is Adjust stability criterion or never achieved in never being met and or stabilize flow. Reduce the flow molbloc-L mode. Reynolds number limit of rate and/or pressure to reduce 1200 is being exceeded.
Page 222 Operation and Maintenance Manual Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution Flow indication appears to Reference pressure to view pressure be incorrect. transducer(s) (RPTs) are indications. Recalibrate RPTs if inoperable or out of necessary. [P&T] (Pressure and calibration.
Page 223 Flow indication appears to molbloc calibration has Check molbloc for contamination. be incorrect. changed due to Contact your Fluke Calibration contamination. authorized service provider if liquid or particulate contamination is detected. Flow indication appears to molbox1+ needs to be Tare molbox1+.
Page 224 Operation and Maintenance Manual Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution Unable to make molbloc- MFC or flow control valve is Valve or regulator used to control S flow measurements connected downstream of flow through molbloc-S must...
Page 225 molbloc® Terminal Troubleshooting Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution Flow indication appears Volume flow pressure and/or Set more accurate values for to be incorrect and flow temperature is/are incorrect. volume flow pressure and/or unit is a volume (actual) temperature.
Page 226 Purge and clean molbox1+ and characterized by circuit is contaminated with associated pneumatic systems. instability and sudden liquids. Contact your Fluke Calibration small jumps in flow rate. authorized service provider. Grossly inaccurate flow RPT(s) destroyed by View pressure readings with .
Page 227 molbloc® Terminal Appendix Table 29. Troubleshooting List (cont.) Symptom Probable Cause Solution MFC connected to The MFC control function is Activate MFC control function by molbox1+ does not not active (OFF). selecting a channel other than appear to respond. zero. [MFC] (Optional) MFC connected to molbox1+ to MFC control...
Page 228 Operation and Maintenance Manual Pressure Table 30. Pressure Unit Conversions To Convert Pa To Multiply By Pascal Mbar Millibar 1.0 E-02 kilo Pascal 1.0 E-03 1.0 E-05 mmWa @ 4 °C Millimeter of water 1.019716 E-01 mmHg @ 0 °C Millimeter of mercury 7.50063 E-03...
Page 229 molbloc® Terminal Appendix Flow Table 32. Conversions from kg/s to sccm at ° 0 C for Various Gases To Convert Multiply By From kg/s TO sccm at 0 °C Air (Air) 4.64109 E+07 Argon (Ar) 3.36398 E+07 Butane (C 2.22112 E+07 Carbon Dioxide (CO 3.03490 E+07 Carbon Monoxide (CO)
Page 230 Operation and Maintenance Manual Table 34. Conversions from Volumetrically Based Flow Units at 0 °C to Corresponding Units at Another Temperature (uxxx) To Convert Volumetrically Based Units at 0 °C To Multiply By Corresponding Units at Another Temperature, Θ, (UXXX) sccm θ...
Page 231 molbloc® Terminal Appendix Table 35. Conversions from kg/s to mole/s for Various Gases (cont.) Helium (He) 2.49838 E+02 Hexafluoroethane (C 7.24533 E+00 Hydrogen (H 4.96032 E+02 Methane (CH 6.23325 E+01 Nitrogen (N 3.56939 E+01 Nitrouss Oxide (N 2.27206 E+01 To Convert kg/sec to mole/s Multiply By Oxygen (O 3.12512 E+01...
Page 232 Operation and Maintenance Manual Table 37. Conversion from sccm at 0 °C to Volume Flow Units at Another Pressure and Temperature To Convert from a Volumetric Mass Flow Unit to the Multiply By Equivalent volume Flow Unit at Temperature θ and P...
Page 233 molbloc® Terminal Appendix Table 38. Driver/Max Current Per Output # of Active Drivers MAX Current per Output 500 mA 400 mA 275 mA 200 mA 160 mA 135 mA 120 mA 100 mA Table 39 Figure 16 as references when building a cable to utilize the drivers port. Table 39.
Page 234 Operation and Maintenance Manual Figure 16. Cable Driver Ports MFC Control Function-MFC Connector Table 40 to correctly build the interfacing cable required to connect the molbox1+ to an MFC. Table 40. Interface Cable Building Instructions molbox1+ MFC Interface Connector (25 Pin Signal Description DSUB) Pin No.
Page 235 molbloc® Terminal Appendix Table 40. Interface Cable Building Instructions (cont.) molbox1+ MFC Interface Connector (25 Pin Signal Description DSUB) Pin No. MFC Setpoint (-) MFC Output (-) Valve Test Common -15 Volts Set Point Sense (+) RS485 TXRX+ RS485 TXRX- Detailed Signal Descriptions +15 Volts: The positive 15 V supply for the MFC.
Page 236 Operation and Maintenance Manual Set Point Sense (+): This signal is used by the molbox1+ to detect loss along the MFC  cable. It represents the positive MFC set point as seen by the MFC. This line should be connected to the same point as the MFC Setpoint (+) line at the MFC side of the cable.
Page 237 molbloc® Terminal Appendix Table 41. Common MFC Connector Pin Out molbox1+ MFC Interface Connector MFC Card Edge Connector Signal Description (25 pin DSUB) Pin Nos. pin No. Case Ground 1 (A1) Supply Common 2 (A2) MFC Output (+) 3 (A3) +15 Volts 4 (A4) Set Point Sense (-)
Page 238 Operation and Maintenance Manual Glossary Absolute As in absolute pressure. Pressure expressed relative to vacuum. Back Pressure Ratio. The ratio of the downstream pressure to the upstream pressure on a molbloc-S critical flow based molbloc element. The BPR is used to determine whether Critical Flow conditions exist so that molbloc-S flow measurements are valid.
Page 239 molbloc® Terminal Glossary Gauge As in gauge pressure. Pressure expressed relative to atmospheric pressure. Head The differential pressure developed by differences in height between two points within a fluid medium. Hi/Lo A DISPLAY function in which the highest and lowest flow observed since hi/lo reset are recorded and displayed.
Page 240 Operation and Maintenance Manual Stability Limit A limit expressed in units of flow per second (for example, sccm/ second). The stability limit is used as the Ready/Not Ready criterion Ready (<*>) if rate is less than stability limit, Not Ready (<↑>...
Page 241 High Pressure (HP) upstream minimum pressure = 200 kPaa (30 PSIa) and maximum pressure = 2 MPaa (290 PSIa). Requires Molbox1+S A2M range to reach maximum flow. Molbox1+S A1.4 M will have reduced maximum flow. [10] DUTs or other restrictions downstream of the molbloc-S can also limit usable flow range.
Page 242 Operation and Maintenance Manual...

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