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AIRDATA
MULTIMETER ADM-860C
™
ELECTRONIC MICROMANOMETER
WITH RS232 COMMUNICATIONS PORT
AIR FLOW • VELOCITY • PRESSURE • TEMPERATURE
OPERATING INSTRUCTIONS
S
Shortridge Instruments, Inc.
i
7855 East Redfield Road / Scottsdale, Arizona 85260-3430
Phone (480) 991-6744 • Fax (480) 443-1267
®
www.shortridge.com
ADM-860C 04/14/08
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Summary of Contents for Shortridge Instruments ADM-860C
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Page 1: Operating Instructions
AIRDATA MULTIMETER ADM-860C ™ ELECTRONIC MICROMANOMETER WITH RS232 COMMUNICATIONS PORT AIR FLOW • VELOCITY • PRESSURE • TEMPERATURE OPERATING INSTRUCTIONS Shortridge Instruments, Inc. 7855 East Redfield Road / Scottsdale, Arizona 85260-3430 Phone (480) 991-6744 • Fax (480) 443-1267 ® www.shortridge.com... -
Page 2: Table Of Contents
6.5.2 LAMINAR FLOW WORKSTATION - VELGRID 6.5.3 AIR FLOW CALCULATION FROM VELGRID VELOCITY 7.0 PRESSURE MEASUREMENT 7.1 DIFFERENTIAL PRESSURE 7.1.1 STATIC PRESSURE PROBES 7.1.2 PITOT TUBE "VELOCITY PRESSURES" 7.1.3 PITOT TUBE "STATIC PRESSURES" 7.1.4 PITOT TUBE "TOTAL PRESSURES" 7.2 ABSOLUTE PRESSURE ADM-860C 04/14/08... - Page 3 14.6 DUCT TRAVERSE USING THE AIRDATA MULTIMETER 14.7 BACKPRESSURE COMPENSATED COMPARISON READING 14.8 NONBACKPRESSURE COMPENSATED COMPARISON READING 15.0 METER MAINTENANCE 16.0 FLOWHOOD MAINTENANCE 17.0 RECALIBRATION AND REPAIR INFORMATION AIR BALANCE MANUALS & TRAINING PROGRAMS WARRANTY APPENDIX A - NIST VELOCITY TESTING ADM-860C 04/14/08...
- Page 4 BATTERY RECYCLING REPLACEMENT PARTS LIST INDEX Copyright © Shortridge Instruments, Inc., 2008. All rights reserved. This information may not be reproduced or duplicated in any manner, or for any purpose, without permission in writing from Shortridge Instruments, Inc. ADM-860C 04/14/08...
- Page 5 ILLUSTRATIONS 3.1 ADM-860C METER FRONT AND BACK 6.1 PITOT TUBE 6.2 AIRFOIL PROBE 6.3 VELGRID ASSEMBLY 7.1 STATIC PRESSURE PROBE 8.1 ADT442 TEMPROBE 8.2 AIRDATA MULTITEMP 10.1 FRAME STORAGE 10.2 FLOWHOOD IN CASE 10.3 FLOWHOOD ASSEMBLY 10.4 2X2 FRAME ASSEMBLY 10.5 1X4 FRAME ASSEMBLY...
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Page 6: Introduction
The ADM-860C has an RS232 port that may be used with a portable printer. The optional printer and cable can download each reading as it is taken, or the contents of the memory can be downloaded and printed all at once. -
Page 7: Specifications
AIR FLOW: Measured in cubic feet per minute (cfm) or liters per second (L/s), corrected for local air density. This function requires the use of the Shortridge Instruments' Series 8400 Backpressure Compensating FlowHood System. The measurement range is 25 to 2500 cfm supply and 25 to 1500 cfm exhaust. - Page 8 TUBING: The maximum recommended length of pneumatic tubing for the measurement of air flow, velocity, or differential pressure is 18 feet. Minimum tubing size is 3/16 inch, inside diameter. The VelGrid is used with the two eight foot lengths of 3/16 inch ID tubing furnished with the kit. ADM-860C 04/14/08...
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Page 9: External Features
The flaps jack is on the back of the meter, in the upper right hand corner. The flaps plug on the FlowHood is inserted here. TEMPERATURE INPUT JACK The temperature input jack is centered on the back of the meter, slightly toward the top. The flexible TemProbe sensor must be connected to this receptacle whenever temperature density correction is ADM-860C 04/14/08... - Page 10 When viewed from the front, the serial port jack is centered on the right side of the meter just below the battery charger jack. The circular plug of a custom RS232 serial cable is connected here. The other end of the cable provides a standard DB9 connection for a printer or computer. ADM-860C 04/14/08...
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Page 11: Adm-860C Meter Front And Back
Battery Compartment Cover - Remove the 8 Small Phillips Head Screws to Test or Replace the Batteries (12 AA NICAD) Four Large Phillips Head Screws That Hold the Meter Case Together - DO NOT REMOVE FIGURE 3.1 ADM-860C METER FRONT AND BACK ADM-860C 04/14/08... -
Page 12: Display Messages And Prompts
Indicates that the result represents an air flow measurement (cfm). "C" indicates that the result has been compensated for backpressure effects. CF:u ± nnnn Indicates that the result represents an air flow measurement (cfm). "U" indicates that the result has not been compensated for backpressure effects. ADM-860C 04/14/08... -
Page 13: Function Readouts
Displays the current reading and its place in the reading sequence during a STORE sequence. Number of decimal places will vary. NP 0 Indicates that the current reading in a manual STORE sequence is a negative pitot tube reading. ADM-860C 04/14/08... - Page 14 Displayed when the STORE key is pressed if readings are in memory. Number of decimal places will vary. n.nnnn This display indicates that the back-light is on and battery power draw has increased. xx indicates the units for the reading. ADM-860C 04/14/08...
- Page 15 STORE sequence. Displayed when the STORE key is pressed three times after HALT during the STORE sequence. ¸ u nnnn Displays the maximum reading of just the nonbackpressure compensated readings stored in memory during a STORE sequence. Displayed when the STORE key is pressed three times after HALT during the STORE sequence. ADM-860C 04/14/08...
- Page 16 This message is displayed when the operator has pressed SHIFT/CLEAR and no readings are in memory. CLEAR MEM This signal is flashed as the STORE functions are cleared. DIFF PRES This signal will be flashed when the differential pressure mode is selected, and also upon each subsequent operation of the READ key. ADM-860C 04/14/08...
- Page 17 This message may be one of the parameters displayed following SHIFT/SHIFT and indicates that individual readings are being taken. The meter is not being used in the memory mode. MEM EMPTY This message indicates that the meter is in STORE mode, but no readings have been saved. ADM-860C 04/14/08...
- Page 18 This display advises the operator that the velocity measurement being attempted is beyond the range of the meter. OVER VEL may also be displayed if internal voltage settings are out of proper range. (Contact factory if meter continues to read OVER VEL at inappropriate times). ADM-860C 04/14/08...
- Page 19 F or 21.1 C. The correction for the ambient barometric pressure will still occur. STORE This message may be one of the parameters displayed following SHIFT/SHIFT and indicates that the meter is being used in the STORE mode. ADM-860C 04/14/08...
- Page 20 This message will be displayed to indicate the units in which readings are being stored. It is also one of the parameters displayed after SHIFT/SHIFT is pressed. VELGRID This signal will be flashed when the VelGrid mode is selected, and also upon each subsequent operation of the READ key. ADM-860C 04/14/08...
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Page 21: Using The Airdata Multimeter
5.0 USING THE AIRDATA MULTIMETER 5.1 GENERAL USE The ADM-860C keypad has eight keys, two of which are dual-purpose keys. The dual-purpose keys are OFF/ON and CLEAR/STORE. The functions shown in the lower, dark colored section of these keys may be activated by pressing the desired key. -
Page 22: Trend Readings
If readings are being taken in flow or velocity, LOCAL DENS will also be displayed. If the TemProbe is not in place during flow or velocity measurements, the meter will display STD 70 F or STD 21.1 C prior to the display ADM-860C 04/14/08... -
Page 23: Recall
MODE key twice. ERASE n? will be displayed where n is the sequence number for that reading. Press the READ key. ERASING will be displayed. The erased reading will ADM-860C 04/14/08... -
Page 24: Clear Memory
Readings may be downloaded directly from the meter to a printer, either as individual readings or multiple readings from memory. Shortridge Instruments, Inc. supplies the Seiko™ model DPU-H245, a palm-sized, portable printer which uses rechargeable batteries. Other compatible printers may also be used. -
Page 25: Data Download To A Computer
Std Dev c 4.9 Std Dev u 5.7 5.5 DATA DOWNLOAD TO A COMPUTER Readings from the ADM-860C may be automatically transmitted to specific cells of a computer spreadsheet such as Microsoft Excel™ for display, analysis and manipulation. This functionality requires either HyperTerminal Private Edition or WinWedge software from TAL Technologies, Inc. -
Page 26: Configuration File Set-Up In Winwedge
The user may require a download format that includes only certain fields. This requires setting the WinWedge Define > Input Data Record Structure to ignore all other data fields and transfer only the relevant data field for each reading. ADM-860C 04/14/08... -
Page 27: Port And Data Input Settings
All of the information in this section is discussed in much greater detail in the WinWedge User’s Manual. 5.5.2 PORT AND DATA INPUT SETTINGS The following port and data input settings are required for use with the ADM-860C AirData Multimeter: Port: COM1 (an alternative serial port may be selected in Port > Settings) -
Page 28: Set-Up Connections And Open The Applications
5.5.7 CONTROL BUTTONS, CURSOR CONTROL, AND FILE PATHS Control Buttons may be defined when a WinWedge configuration file is being set-up. These buttons use the same meter commands as the Function Keys (D<CR> changes mode to Differential Pressure). The defined ADM-860C 04/14/08... -
Page 29: Automatic Repeat Readings Controlled By Winwedge
WinWedge processing of incoming data may be suspended and started again using the Quit > Suspend pull- down window. Suspending WinWedge will stop the Serial Output Strings read commands being transmitted to the meter, but will not stop the meter from processing commands which are already in the meter buffer. ADM-860C 04/14/08... -
Page 30: Minimizing Winwedge
The meter is also more prone to locking up and experiencing other problems due to confusion between commands issued to the meter using the computer keyboard and commands issued to the meter using the meter keypad. This printer equivalent download method is not recommended. ADM-860C 04/14/08... -
Page 31: Velocity Measurement
6.0 VELOCITY MEASUREMENT Air velocity measurements obtained with the ADM-860C AirData Multimeter are automatically corrected for the density effect of barometric pressure on the velocity readings. The TemProbe sensor must also be used to obtain readings corrected for the changes in density caused by the temperature of the air being measured. If the TemProbe has not been connected to the meter, STD 70 F or STD 21.1... -
Page 32: Pitot Tube Velocity Measurement
Connect one of the tubing sections from the positive (+) port of the meter to the total pressure connection (in line with the main shaft) on the pitot tube and connect the negative (-) port to the static pressure connection (perpendicular to the main shaft). ADM-860C 04/14/08... -
Page 33: Pitot Tube
This zero will be calculated in the velocity sum and average, and will be displayed as a minimum reading of NP 0. It will also be recalled as nns NP 0. A memory sequence cannot be started with a NEG PITOT reading. ADM-860C 04/14/08... -
Page 34: Airfoil Velocity Measurement
The AirFoil probe lee side pressure connector should point downstream with the air flow. FIGURE 6.2 AIRFOIL PROBE The AirFoil probe lee side pressure port is not equivalent to the static pressure port on a pitot tube, and must not be used to obtain static pressure readings. ADM-860C 04/14/08... -
Page 35: Duct Velocity Using Airfoil Probe
The actual airstream direction is usually at various angles to the plane of the opening around the sash perimeter, so velocities cannot be reliably measured near the edge of the opening. The tip of the AirFoil probe must be positioned at least 2 inches from the edge of the sash opening of the exhaust hoods. ADM-860C 04/14/08... -
Page 36: Laminar Flow Workstations - Airfoil Probe
The VelGrid is bidirectional in function. A negative sign will be displayed if the hose connections are reversed or if the air flow direction is reversed in relation to the higher pressure side of the VelGrid. If the user knows that the hoses are reversed, the negative sign may be disregarded. ADM-860C 04/14/08... -
Page 37: Chemical Exhaust Hoods - Velgrid
The total intake area and air flow of an exhaust hood includes all areas of air entry, including the space behind and around the sash; under the threshold; and through service openings. It is accepted practice to assume that the velocity through these additional areas is the same as that of the sash opening area. ADM-860C 04/14/08... -
Page 38: Velgrid Assembly
FIGURE 6.3 VELGRID ASSEMBLY ADM-860C 04/14/08... -
Page 39: Pressure Measurement
(+) port of the meter to the total pressure connection (in line with the main shaft) on the pitot tube. Connect the other tubing section from the negative (-) port to the static pressure connection (perpendicular to the main shaft). The pitot tube connections are shown in Figure 6.1. If the connections are reversed, the ADM-860C 04/14/08... -
Page 40: Pitot Tube "Static Pressures
The absolute pressure measuring accuracy should be checked periodically. Readings taken with the negative port (-) open to the atmosphere should be within ± 2% of the actual barometric pressure to assure rated accuracy of density corrected flow and velocity readings. ADM-860C 04/14/08... -
Page 41: Temperature Measurement
AirData Multimeter. Up to eight temperature probes (each with a 12' cord) can be connected into the eight small, numbered temperature input jacks on the top edge of the switch box. The jack numbers correspond to the eight switch position numbers surrounding the switch. ADM-860C 04/14/08... -
Page 42: Airdata Multitemp
The surface probes may be used to measure pipeline surface temperatures when piping systems do not have thermometer wells. These probes may also be used as fast acting air probes. ADM-860C 04/14/08... - Page 43 $ 0.25 F per additional MultiTemp and cable extender at 154 F. The offset correction(s) must be determined by comparing readings taken with and without the additional MultiTemps and extender cables at the temperature(s) to be measured. ADM-860C 04/14/08...
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Page 44: Air Flow Measurement
FlowHood unit. The backpressure compensated measurement is always performed following a required preliminary nonbackpressure compensated measurement taken with the flaps open. ADM-860C 04/14/08... -
Page 45: Flowhood Assembly
FlowHood base. The rod ends may be moved upward or downward as needed to control the tightness of the fabric top. The support dowels can ADM-860C 04/14/08... -
Page 46: Handle
10.5 HANDLE Attach the handle assembly to the handle plate using the knob type screw provided with the handle. SEE THE NEXT FOUR PAGES FOR DIAGRAMS OF THE CORRECT METHOD FOR ASSEMBLING STANDARD FLOWHOOD TOPS AND FRAME SETS. ADM-860C 04/14/08... -
Page 47: Frame Storage
FIGURE 10.1 FRAME STORAGE FIGURE 10.2 FLOWHOOD IN CASE ADM-860C 04/14/08... -
Page 48: Flowhood Assembly
FIGURE 10.3 FLOWHOOD ASSEMBLY ADM-860C 04/14/08... -
Page 49: 2X2 Frame Assembly
FIGURE 10.4 2X2 FRAME ASSEMBLY FIGURE 10.5 1X4 FRAME ASSEMBLY FIGURE 10.6 2X4 FRAME ASSEMBLY ADM-860C 04/14/08... -
Page 50: 1X5 Frame Assembly
FIGURE 10.7 1X5 FRAME ASSEMBLY FIGURE 10.8 3X3 FRAME ASSEMBLY ADM-860C 04/14/08... -
Page 51: Flowhood Operating Procedure
Correction curves had traditionally been used to provide an average correction factor for the backpressure effects at different air flows. This method measures air flow with compensation for the FlowHood induced backpressure automatically calculated into the displayed result. Backpressure compensation requires two readings in immediate sequence. ADM-860C 04/14/08... -
Page 52: Memory Display In Flowhood Mode
RATIO ERR may also be displayed as the result of measurements taken at outlets with extremely low pressure drops (less than .003 in wc @ 500 cfm). These outlets may not be suitable for the backpressure compensation method, and may require other means of air flow measurement. ADM-860C 04/14/08... -
Page 53: Special Balancing Procedures
The backpressure compensation process requires special attention when used to measure air flow at individually controlled constant volume air terminals. The nonbackpressure compensated and the backpressure compensated air flow readings should be essentially equal for fast acting constant volume air terminals. The ADM-860C 04/14/08... -
Page 54: Linear Slot Diffusers
ADM-860C 04/14/08... -
Page 55: Correction Factors
13.4 RELATIVE HUMIDITY CORRECTION The ADM-860C AirData Multimeter does not correct for the density effects of relative humidity on air flow and velocity readings. The effect of minor variations in relative humidity on local air density (and therefore on flow and velocity readings) is relatively small under normal room temperature conditions. -
Page 56: Hot Wire Anemometer Versus Airdata Multimeter
13.5 HOT WIRE ANEMOMETER VERSUS AIRDATA MULTIMETER The ADM-860C AirData Multimeter measures local density true air velocity. This is in contrast to thermal anemometers or "hot wire" instruments which measure mass flow (mass flux/unit time). Mass flow represents the number of molecules of air flowing past a given point during a given time. Mass flow only represents true velocity when measured at standard sea level conditions of 29.921 in Hg and 70... -
Page 57: Meter Accuracy Field Testing
The duct traverse location should have straight duct for six to eight duct diameters upstream, and three to four diameters downstream. For example, a one foot diameter duct requires eight feet of straight duct upstream and four feet downstream. ADM-860C 04/14/08... -
Page 58: Duct Traverse Comparisons, Inclined Manometer, Micromanometer
A flaps open, nonbackpressure compensated FlowHood reading on this same diffuser should be within ± 3% of FLOW (calculated from the ratio of the two centerline readings). FLOW is obtained from the following calculation: Where: = flow calculated from duct traverse = flow in duct with FlowHood in place (flaps open) ADM-860C 04/14/08... -
Page 59: Meter Maintenance
Excessive dirt build up should be avoided. Reasonable care will prolong the life of the fabric tops. Sharp objects or corners can puncture the fabric and affect the accuracy of the readings. ADM-860C 04/14/08... -
Page 60: Recalibration And Repair Information
12"x12"x8" with sufficient additional cushioning to fill the carton. Do not use spray foam. Spray foam can damage the meter and it is also possible to “lose” a meter in a chunk of spray foam. Ship directly to: Shortridge Instruments, Inc. 7855 E. Redfield Rd. Scottsdale, Arizona 85260 Attention: Recalibration and Repair Dept. -
Page 61: Warranty
Shortridge Instruments, Inc. reserves the right to make changes at any time, without notice, in prices, colors, materials, specifications and models, and also to discontinue models. -
Page 62: Appendix A - Nist Velocity Testing
The tests described above are extensive and relatively expensive. The expense of obtaining such traceability is justifiable when a transfer standard meter and probes are designated as a "Sheltered Set". This "Sheltered Set" should only be used to verify the accuracy of instruments which are used in the field. ADM-860C 04/14/08... -
Page 63: Appendix B - Laboratory Differential Pressure Test
Some applications such as nuclear power plants, health care facilities and clean rooms require more frequent instrument calibration testing and accuracy verification. Calibration services and documentation is available at Shortridge Instruments, Inc. However, if interim calibration tests are required at your own metrology department or at an independent laboratory, the following information will be helpful. -
Page 64: Appendix C - Battery Test Procedure
Instruction Manual Section 15.0 METER MAINTENANCE. If the problem is not corrected through these procedures, please return the meter to our factory for repair and calibration services. Shortridge Instruments, Inc. 7855 E. Redfield Road Attn: Recalibration Department Scottsdale, Arizona, USA 85260 Phone: (480) 991-6744 Fax: (480) 443-1267 www.shortridge.com... -
Page 65: Prolonging Battery Life
Please call 1-800-822-8837 for information on Ni-Cd battery recycling and disposal bans/restrictions in your area. Shortridge Instruments, Inc. involvement in this program is part of our commitment to preserving our environment and conserving our natural resources. -
Page 66: Adt442 Temprobe
ADM-860C - REPLACEMENT PARTS LIST Part no No reqd per set Description ADM-860CM Advanced AirData Multimeter PS8201 Battery charger 220/110 AK Voltage Converter 220/110 & plug adapter set PS8202 Battery charger for European use 0445 Plug adapter set for use with PS8202 battery charger... - Page 67 ADM-860C - REPLACEMENT PARTS LIST (continued) Part no No required per set Description 2' x 4' TOP (63.5 x 119.4 cm) Side channel (type 1) Side channel (type 2) End channel (type 4) 2x4F Complete frame assembly (all of above) 2x4S Cloth skirt (25"...
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Page 68: Index
20-23 IN: READ constant volume air terminals IN: ± n.nnnn control buttons individual readings controlled by computer correction factors, velocity 26, 27 input buffer size cursor control keypad 4, 6, 25 data bits 19, 22 kitchen exhaust hoods ADM-860C 04/14/08... - Page 69 NO LIGHT/BATTERY/TOO LOW single point centerline air velocity readings NO PROBE 13, 36 SMACNA nonbackpressure compensated reading 18, 39, 46- standard density 48, 53 static pressure 27, 29, 34, 35 NOT ALLOWD static pressure probes NP 0 STD 21.1 ADM-860C 04/14/08...
- Page 70 9 n.nnnn xx _ n.nnnn xx ` n.nnnn ¸ c nnnn 10, 47 º c nnnn 10, 47 ¸ u nnnn 10, 47 º u nnnn 10, 47 zero bias zero test readings zeroing C: ± nnn.n C: READ ADM-860C 04/14/08...
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