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Vaisala DEWCAP DM500 User Manual

Vaisala DEWCAP DM500 User Manual

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USER'S GUIDE
®
Vaisala DEWCAP
Precision SAW
Hygrometer
DM500
M210205EN-D

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Summary of Contents for Vaisala DEWCAP DM500

  • Page 1 USER'S GUIDE ® Vaisala DEWCAP Precision SAW Hygrometer DM500 M210205EN-D...
  • Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of...

  • Page 3: Table Of Contents

    Measuring in Overpressure........... 26 The Effect of the Ambient Temperature on Cooling Capacity................... 27 The Effect of the Liquid Coolant Temperature on Cooling Capacity................... 28 The Effect of the Sample Gas Flow Rate on Cooling Capacity and Result Deviation..........29 VAISALA ________________________________________________________________________ 1...
  • Page 4 User's Guide ______________________________________________________________________ CHAPTER 5 INFORMATION ON OPTIONAL PARTS .............31 Optional Heated Gas Tubes...........31 Optional External Temperature Sensor........32 Wetted Materials of the Optional Parts ........33 CHAPTER 6 SETTING UP FOR OPERATION ..............35 Connection of the DMI500 and DMP501 Units.....35 Swagelok tube fittings' installation instructions ....36 Connecting the Sample Gas Flow ........37 Selecting the Cooling Method ..........38 Connecting the Cooling Liquid ..........39...
  • Page 5 Calibration Interval .............. 81 Calibration Laboratory............81 Calibrating DM500 Equipped with a Pump ......82 Making an Adjustment ............82 CHAPTER 16 SERIAL LINE COMMANDS................. 85 Serial Commands ..............85 Output Commands (DMI500)..........86 R Continuous Output ............. 86 VAISALA ________________________________________________________________________ 3...
  • Page 6 User's Guide ______________________________________________________________________ S Stopping the Continuous Output.........87 ADDR Setting the Device Address.........87 SEND Outputting One Single Reading ......87 INTV Setting the Output Interval ........87 FORM Defining the Output Format ........88 Operational Commands ............91 START Starting the Measurement .........91 STOP Stopping the Measurement .........91 PUMP Starting/Stopping the Optional Sample Gas Pump91 HEAT Starting/Stopping the Optional Heater....92 SALT Enables/Disables the Salt Contamination Detection92...
  • Page 7 Partial Pressure of Water Vapor (P ) ......... 129 Relative Humidity (RH)............129 Mixing Ratio (x)..............130 Absolute Humidity (a) ............131 Absolute Humidity at NTP (aNTP) ........131 Wet Bulb Temperature ............131 Enthalpy (h)................131 VAISALA ________________________________________________________________________ 5...
  • Page 8 User's Guide ______________________________________________________________________ Humid Air Volume/Dry Air Volume PPM ......132 Effect of Pressure on Dewpoint ..........132 Using a Condensation Hygrometer ........132 List of Figures Figure 1 DMI500 User Interface Unit Front Panel ........15 Figure 2 DMP501 Dewpoint Sensing Unit Front Panel ......16 Figure 3 DMI500 User Interface Unit Back Panel........17 Figure 4...

  • Page 9: Chapter 1 General Information

    M210205EN-D 4th version, May 2005 Feedback Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication. If you find errors or have other suggestions for improvement, please indicate the chapter, section, and page number. You can send comments to us by e-mail: manuals@vaisala.com...

  • Page 10: Safety

    User's Guide ______________________________________________________________________ Safety General Safety Considerations Throughout the manual, important safety considerations are highlighted as follows: Warning alerts you to a serious hazard. If you do not read and follow WARNING instructions very carefully at this point, there is a risk of injury or even death.

  • Page 11: Esd Protection

    Chapter 1 ________________________________________________________ General Information ESD Protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.
  • Page 12 Typenschild des Produkts angegeben ist. Die Systeme DMP501 und DMI500 enthalten keine vom Benutzer zu wartenden Teile. Zur Vermeidung von Sicherheitsrisiken durch gefährliche Spannungen darf das Gehäuse nur von befugtem Vaisala-Wartungspersonal geöffnet werden. Halten Sie das Gerät von entflammbaren, hoch reaktiven und giftigen Gasen fern. Sorgen Sie bei Verwendung anderer Gase als Luft für ausreichende Belüftung...
  • Page 13 Der er ingen dele inde i DMP501 eller DMI500, som kan efterses af brugeren. Med henblik på at undgå risiko for skader, er delene med farlig spænding afdækket, og kabinettet på må kun fjernes af autoriserede Vaisala- serviceteknikere.

  • Page 14: Trademarks

    Microsoft Corporation in the United States and/or other countries. License Agreement All rights to any software are held by Vaisala or third parties. The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement.

  • Page 15: Chapter 2 Product Overview

    - Absolute humidity a (g/m3 or gr/ft3) - Mixing ratio x (g/kg or gr/lb) - Enthalpy h (kJ/kg or btu/lb) - Difference of T and T T (ºC or ºF) - Temperature T (ºC or ºF) - Pressure P (bar, hPa, psi, torr) VAISALA _______________________________________________________________________ 13...
  • Page 16 User's Guide ______________________________________________________________________ - Air flow rate flow (slpm, scfh) The DM500 system includes two packages including the following parts: DMI500 - DMI500 user interface unit - Serial cable for EIA-232 (RS232) - CD-Rom including MI70 Link software; to transfer logged data to your PC - Power cable (according to the customer's requirement) DMP501...

  • Page 17: Front Panels

    In the menus, you can navigate with arrow buttons. Up and down arrows for moving in the menu, right-pointing arrow for selecting menu item, left-pointing arrow for returning to previous menu. Numeric keypad. Numerical input can be given with the number keypad. VAISALA _______________________________________________________________________ 15...

  • Page 18: Figure 2 Dmp501 Dewpoint Sensing Unit Front Panel

    User's Guide ______________________________________________________________________ Figure 2 DMP501 Dewpoint Sensing Unit Front Panel The following numbers refer to Figure 2 above: Power/data cable; connect to the back panel of the DMI500. Allen screw for adjusting the sample flow. Sensor cup; three Allen screws to open the cup for sensor cleaning.

  • Page 19: Back Panels

    Figure 3 DMI500 User Interface Unit Back Panel The following numbers refer to Figure 3 above: Relay outputs (optional) Serial port (EIA-232, RS232 for Terminal/MI70-link Connection to DMP501 Mains cable RS485 and LonWorks-port (optional) Analog outputs (optional) VAISALA _______________________________________________________________________ 17...

  • Page 20: Figure 4 Dmp501 Dewpoint Sensing Unit Back Panel

    User's Guide ______________________________________________________________________ Figure 4 DMP501 Dewpoint Sensing Unit Back Panel The following numbers refer to Figure 4 above: Water In (WI) Gas In (GI) Connection to DMI500 Relay for heated sample lines Water Out (WO) Temperature sensor connection (optional) Service switch 4: Adjustment enable switch Gas Out (GO) Serial port EIA-232, RS232...

  • Page 21: Optional Accessories And Spare Parts

    Vaisala service personnel. NORTH AMERICAN SERVICE CENTER Vaisala Inc., 100 Commerce Way, Woburn, MA 01801-1068, USA. Phone: +1 781 933 4500, Fax +1 781 933 8029 Email: us-customersupport@vaisala.com EUROPEAN SERVICE CENTER Vaisala Instruments Service, Vanha Nurmijärventie 21 FIN-01670...
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  • Page 23: Functional Description

    (1/3 DIN B, Pt100, 4-wire) bonded on the backside of the quartz substrate. This measured value is used to accurately output the dew/frostpoint temperature. Figure 5 DM500 Operating Principle Illusrated VAISALA _______________________________________________________________________ 21...

  • Page 24: Sensing Element

    User's Guide ______________________________________________________________________ Sensing Element The DEWCAP® SAW sensor, as used in the condensation hygrometer, integrates the cooled surface (where condensation forms) with the detection mechanism in one element. The element consists of a transmitting and a receiving antenna photolithographically patterned on a single mechanically very durable crystal quartz chip.

  • Page 25: Contamination And Chemical Resistance

    Vectra® (Liquid Crystal Polyester). Vectra and silicone parts as well as those optional components that have water-absorbing materials are located downstream from the active area of the sensor thus not disturbing the measurement especially in low dewpoints. VAISALA _______________________________________________________________________ 23...
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  • Page 27: General Information About Sampling And Results

    - Ensure that flow rate is adequate - Avoid dead ends as they cannot be flushed easily - The temperature of the gas line components must never lie under the dewpoint of the sample gas, as this leads to condensation and false results VAISALA _______________________________________________________________________ 25...

  • Page 28: Measuring In Overpressure

    User's Guide ______________________________________________________________________ - Sample tubing shall be as short as possible, the surface area should be minimized by using the tubing with the smallest diameter that the flow conditions shall permit - Surface finishing of wetted surfaces is important, polished or electropolished steel is recommended for best results - Avoid hygroscopic materials in the sampling lines, use stainless steel membranes instead of rubber membranes...

  • Page 29: The Effect Of The Ambient Temperature On Cooling Capacity

    Recommended air temperature: 10...40 ºC (50...104 ºF), depending on the measured dewpoint. Water cooling is recommended when measuring dewpoints > +40 ºC (+104 ºF). Figure 7 Effect of Ambient Air Temperature on Lowest Achievable Stable Sensor Temperature VAISALA _______________________________________________________________________ 27...

  • Page 30: The Effect Of The Liquid Coolant Temperature On Cooling Capacity

    User's Guide ______________________________________________________________________ The Effect of the Liquid Coolant Temperature on Cooling Capacity The cooling capacity of the sensor is dependent on the cooling water temperature, as shown in Figure 8. Recommended water temperature: < 15 ºC (50 ºF). Figure 8 Effect of Water Temperature on Lowest Achievable Stable Sensor Temperature Sample gas flow in the above Figure 8 1.0 slpm;...

  • Page 31: The Effect Of The Sample Gas Flow Rate On Cooling Capacity And Result Deviation

    (on the right). Figure 10 0.15 0.05 Sample flow rate range: 0.5...1.5 slpm. -0.05 -0.1 Recommended sample flow rate: 1.0 slpm. -0.15 -0.2 0.75 1.25 flow/slpm Figure 10 Effect of Sample Flow Rate on Dewpoint Measurement at -60 ºC VAISALA _______________________________________________________________________ 29...
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  • Page 33: Information On Optional Parts

    It is recommended to use heated gas tubes already for dewpoints 5 ºC (9 ºF) below ambient temperature. Internal gas tubes The optional heated gas tubes keep the internal gas tubes and sensor chamber temperature above 60ºC. VAISALA _______________________________________________________________________ 31...

  • Page 34: Optional External Temperature Sensor

    User's Guide ______________________________________________________________________ External gas tubes The heating of the external gas tubes shall be taken care by the user. The external lines shall be heated before letting the sample gas flow in the lines. This is to avoid condensation problems. To facilitate external gas line heating control, the relay output on the back plate of the DMP501 activates when heating is ON.

  • Page 35: Wetted Materials Of The Optional Parts

    Wetted Materials of the Optional Parts Polyarylamide, NBR (nitril butyl Pump rubber), galvanized steel. Stainless steel (AISI 316) Integrated pressure sensors Silicon nitride, polyethermide, Integrated flow sensor fluorocarbon, aluminium, oxide, epoxy, silicon, gold Glass, stainless steel, silicone External temperature sensor VAISALA _______________________________________________________________________ 33...
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  • Page 37: Setting Up For Operation

    - Connect the serial output cable, analog output data cable (back panel of the DMI500) and relay connections (back panel of the DMI500), when used. See the ports from page 17 Back Panels. - Connect the DMI500's grounded power supply cable (provided) to the grounded box. VAISALA _______________________________________________________________________ 35...

  • Page 38: Swagelok Tube Fittings' Installation Instructions

    User's Guide ______________________________________________________________________ Swagelok tube fittings' installation instructions Insert the tubing into the Swagelok tube fitting. Tubing should rest firmly on the shoulder of the fitting. The nut should be finger tight. Mark the nut at the 6 o'clock position. Hold the fitting body with a backup wrench and tighten the nut 1¼...

  • Page 39: Connecting The Sample Gas Flow

    Gas Out (GO) Detach the Swagelok fittings from Gas In (GI) and Gas Out (GO) connections. If the sample gas can flow out to measuring room, it is not necessary to connect the GO fitting. Replace the VAISALA _______________________________________________________________________ 37...

  • Page 40: Selecting The Cooling Method

    User's Guide ______________________________________________________________________ 6 mm fitting with the ¼" adapter fitting (provided), if needed. If you use the adapter fitting, see that the 6 mm side is connected to the Gas In -connection. Attach the gas tubes (diameter of 6 mm or ¼") to the Swagelok fittings.

  • Page 41: Connecting The Cooling Liquid

    Let the water flow with the flow rate of 5...20 l/min, temperature of water shall be <+15 ºC (50 ºF). Check for leaks and tighten if necessary. Once the water tube connections have been tightened, the water tubing should be disconnected from the Swagelok fittings. VAISALA _______________________________________________________________________ 39...

  • Page 42: Connecting The Condensation Water Drain Tube

    User's Guide ______________________________________________________________________ Connecting the Condensation Water Drain Tube Significant moisture condensation occurs only if the system is water- cooled. Connect the condensation water drain tube to the outlet situated on the right-side panel of the DMP501. Connect the silicone tube to the metal tube protruding from the right side of the DMP501 Dewpoint Sensing Unit.

  • Page 43: Measuring The Dewpoint

    Display before activating the measurement mode Select the water or air cooling method. Press the soft key ► , select by using arrow button . Select Measu settings Cooling method . See page 38, Selecting the cooling method. WATER VAISALA _______________________________________________________________________ 41...

  • Page 44: More About The Moisture Phases

    User's Guide ______________________________________________________________________ To achieve the optimum measuring results, clean the sensor and determine the clean sensor value before the first measurements, see page 65. Start measurement by pressing START/STOP Wait until yellow led turns to green in the DMP501 dewpoint sensing unit front panel.
  • Page 45 Chapter 7 _____________________________________________________ Measuring the Dewpoint automatically converted to a corresponding dewpoint temperature, which is then displayed to the user. The symbol on the display changes to after the freezing is complete. VAISALA _______________________________________________________________________ 43...
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  • Page 47: Displays And Menus

    Symbol which indicates the cooling method, air, water Symbol which indicates that optional pump for the sampling line is on. If this symbol is not shown, the pump is off. Shows that the alarming condition is valid. VAISALA _______________________________________________________________________ 45...

  • Page 48: Graphical Display

    User's Guide ______________________________________________________________________ Error limit: The 2σ deviation of the measured sensor temperatures. Appears when the system is balanced and statistical filtering activated. During an unstable intermediate moisture phase indicated by blinking symbols, error limit value is higher than in stabilized state. Preset value(s): All the preset values are shown in the header if they are not selected for the display.

  • Page 49: Menus And Navigation

    Open the main menu by pressing any of the buttons. Move in the menus by using buttons. Select the item with button. Press to return to the earlier level. Press to return you back to the main view. EXIT Figure 18 DM500 Menus and Displays VAISALA _______________________________________________________________________ 47...
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  • Page 51: Chapter 9 Basic Settings

    Self diagnostics Graphic trend shortcut for the functions can be changed according to your needs. Open the : press MENU Select ► , press Settings Select ► , press User Interface Select , press Program shortcut keys START VAISALA _______________________________________________________________________ 49...

  • Page 52: Key Click On/Off

    User's Guide ______________________________________________________________________ Press the shortcut key you want to change, for example ► Measurement settings Select the new shortcut function by using arrow buttons, press . Answer to confirm your selection, otherwise answer SELECT and continue from item 4. Press to return to the main view.

  • Page 53: Device Information

    The display gives the basic information on the device. Press to get more information and to return to the MORE EXIT main view. Figure 19 DMI500 User Interface Unit Information Figure 20 DMP501 Dewpoint Sensing Unit Information VAISALA _______________________________________________________________________ 51...

  • Page 54: Reverting Factory Settings

    User's Guide ______________________________________________________________________ Reverting Factory Settings Factory settings can be reverted to clear all changed settings and data memory. Reverting factory settings does not affect sensing unit calibration. Open the : press MENU Select ► , press Settings Select Factory settings, press .

  • Page 55: Chapter 10 Display Settings

    Flow slpm, scfh If sampling from process, parameter is relevant only if the optional temperature sensor is used to measure real temperature of the process gas (or if the actual T value is set manually). VAISALA _______________________________________________________________________ 53...

  • Page 56: Hold/Save Display

    User's Guide ______________________________________________________________________ If sampling from process, parameter is relevant only if the optional pressure sensor is used.(or if the actual P value is set manually) If sampling from process, parameter is relevant only if the optional flow sensor is used (or if the actual Flow value is set manually). More about the difference between Td/f and Td on page 128.

  • Page 57: Graphic Trend

    Graphic Trend Graphic trend shows you the data curve from the time turning on the device. Open : press MENU Select ► , press Display Select , press Graphic trend SHOW VAISALA _______________________________________________________________________ 55...

  • Page 58: Contrast Adjustment

    User's Guide ______________________________________________________________________ Press to see the graphic trend of the other parameters. NEXT Press to see the statistics of the saved data. INFO Press to set the following graph options OPTIONS : Select to have the data shown numerically. Show value Select to hide the numerical value.
  • Page 59 Mute the alarming by pressing MUTE If the alarming condition is still valid a small note sign remains in the header of the display. The note sign disappears when the alarming condition is not valid anymore. VAISALA _______________________________________________________________________ 57...
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  • Page 61: Chapter 11 Measurement Settings

    Measurement settings Select Autom.frost detection To enable the sensing, press To disable the sensing, press Press to return to the main view. EXIT Cleanliness of the sensor is essential for the proper operation of frost NOTE detection. VAISALA _______________________________________________________________________ 59...

  • Page 62: Forced Freezing

    User's Guide ______________________________________________________________________ Forced Freezing In some measurement conditions there may be formation of a two phase system, ice-dew, on the sensor. This situation is dynamic and the time needed to reach an equilibrium may be rather long. To avoid an unstable phase transition, the DM500 has a function for generating a stable layer of frost on the sensor right from the beginning of the measurement.

  • Page 63: Statistical Filtering

    , press Measuring Select ► , press Measurement settings Select , press Statistical filtering Press to return to the main view. EXIT The statistical filtering can also be turned on/off by using serial command ANAL, see serial commands. VAISALA _______________________________________________________________________ 61...

  • Page 64: Response Speed

    User's Guide ______________________________________________________________________ Response Speed You can set the response speed to stable, normal (default) or fast. If fast transients in the dewpoint prevent the system from reaching balance, the signal can be stabilized by selecting the Stable response speed. Fastest response time is achieved by setting the speed to Fast but this may increase the noise in the dewpoint measurement.

  • Page 65: Transient Recovery Time

    Open : press MENU Select ► , press Measuring Select ► , press Process variables Select the parameter you want to change by using the arrow buttons. Press to clear the old value. CLEAR VAISALA _______________________________________________________________________ 63...
  • Page 66 User's Guide ______________________________________________________________________ Set the new value by using numerical buttons. Press to confirm the settings. Press to return to the main view. EXIT selection menu is only available for those Process variables parameters that are set, not measured. 64 __________________________________________________________________ M210205EN-D...

  • Page 67: Self Diagnostics Settings

    The salt detection, as well as the clean sensor value determination require a gas flow with dewpoint above 0º C through the sensing unit. Lower dewpoints can also be used as long as the moisture phase remains liquid. VAISALA _______________________________________________________________________ 65...

  • Page 68: Sensor Circuit Check

    User's Guide ______________________________________________________________________ If the salt detection sees salt on the sensor (message on the display), please clean the sensor carefully, see page 113. The salt warning message is shown when the measured value decreases below 80 % of the salt detection limit. It is not recommended to use serial commands during the salt detection.

  • Page 69: Cooling Capacity Test

    Cooling capacity test Press to start the test. The test may take up to 20 min. START During that time the measuring is stopped and you can follow the actual temperature of the sensor from the display: VAISALA _______________________________________________________________________ 67...

  • Page 70: Error History

    User's Guide ______________________________________________________________________ The serial output command R shows frozen values. You can cancel the testing sequence by pressing the CANCEL When the test is completed, you see the following display: Press to return to the main view. EXIT The following factors affect the cooling capacity: - Temperature of the environment - Temperature of the cooling water and - Gas flow rate of the sample.

  • Page 71: Chapter 13 Recording Data

    . Note the maximum recording Duration durations are based on the measurement interval ! To start recording, select , press . The Start/Stop recording START progress bar is shown on the display showing the amount of recorded data. VAISALA _______________________________________________________________________ 69...

  • Page 72: Stopping Recording

    User's Guide ______________________________________________________________________ Interval Max. recording duration (memory full) 68 min 15 s 30 s 1 min 13 h 5 min 68 h 15 min 30 min 17 d 1 hour 34 d 3 hours 102 d 12 hours 409 d Stopping Recording Open : press...

  • Page 73: Deleting All Record Files

    The data memory can be cleared as follows: Open : press MENU Select ► , press Recording/Viewing Select , press . Press to confirm Clear data memory CLEAR deletion of all recorded data files. Press to return to the main view. EXIT VAISALA _______________________________________________________________________ 71...
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  • Page 75: Output Interfaces

    DMI500 User Interface Unit Back Panel (Same as Figure 3) The following numbers refer to Figure 21 above: Relay outputs (optional) Serial port (EIA-232, RS232 for Terminal/MI70-link Connection to DMP501 Mains cable RS485 and LonWorks-port (optional) Analog outputs (optional) VAISALA _______________________________________________________________________ 73...

  • Page 76: Serial Communication Settings

    User's Guide ______________________________________________________________________ The dip switches behind the DMI500 MUST NOT be touched, CAUTION because the processor may be destroyed as a result of false dip switch positions. Before connecting a PC to DMI500 or DMP501, make sure there is NOTE no ground potential difference between PC and the DM500.

  • Page 77: Analog Outputs (Optional)

    These 2-wire channels must be powered with 12...28 VDC external power supplies (not provided). The analog outputs are galvanically isolated from electronics but they are not isolated from each other. Thus, you need a separate (isolated) power supply for each monitored analog channel. VAISALA _______________________________________________________________________ 75...
  • Page 78 User's Guide ______________________________________________________________________ The port connections are as follows: pin 1: ch+ (+VDC supply voltage) pin 2: ch- (-VDC supply voltage) pin 3: test (for service use only) pin 4: shield When using 12V loop voltage, the resistance must be less than 90 ohms.

  • Page 79: Relay Outputs (Optional)

    , press , select the quantity for the relay Quantity output and press SELECT Select , press . Set the value above which you Active above: xx want the relay to be activated. Use the numeric buttons. Press VAISALA _______________________________________________________________________ 77...
  • Page 80 User's Guide ______________________________________________________________________ Select , press . Set the value below which you Active below: xx want the relay to be released. Use the numeric buttons. Press When the measured value is in between the above and below values, the relay is passive. When choosing lower value as above value and higher value as below value the relay is passive when the measured values is not between the set values.
  • Page 81 You can test the relay operation with the Relay test button. Relay is forced to change state as long as you press the Relay test button. Relays can be configured also by using the serial line (see command RSEL). VAISALA _______________________________________________________________________ 79...
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  • Page 83: Calibrationd And Adjustment

    After adjustment, the original calibration certificate shipped with the product is not valid anymore. Calibration Laboratory The dewpoint calibration shall be carried out at Vaisala or in other calibration laboratory capable to perform high accuracy dewpoint calibrations traceable to national/international standards.

  • Page 84: Calibrating Dm500 Equipped With A Pump

    User's Guide ______________________________________________________________________ Calibrating DM500 Equipped with a Pump If you have the DM500 with a pump, ensure that the sample flow rate from the humidity generator is sufficient. See the following example: Open outlet Reference (with diffusion coil) instrument 1 splm Humidity Gas flow...
  • Page 85 Continue giving the references. Make the adjustment by pressing Adjust The adjustment result is shown. Press EXIT Turn the service switch 4 to OFF-position (adjustment disabled). The system calculates a 3rd degree correction polynomial fitted to the adjustment data. VAISALA _______________________________________________________________________ 83...
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  • Page 87: Serial Line Commands

    Starting/Stopping the optional heater HEAT* Enables/disables the salt contamination detection SALT* Starts the salt detection limit determination cycle SCAL* Starts the cooling capacity test PTEST* Starting/Stopping the statistical filtering ANAL* Enables/disables the automatic forced freezing procedure FFROST* VAISALA _______________________________________________________________________ 85...

  • Page 88: Output Commands (Dmi500)

    User's Guide ______________________________________________________________________ Setting commands Setting the serial communication parameters SERI Setting the units UNIT Setting the date and time TIME Setting the relays RSEL Setting and scaling the analog outputs ASEL Setting the invalid output value for the analog channel AERR Setting the cooling method status COOLER*...

  • Page 89: S Stopping The Continuous Output

    The address is used in POLL mode when more than one device is connected to one serial line. SEND Outputting One Single Reading Syntax: SEND x<cr> where device address (0...99) in POLL state INTV Setting the Output Interval Syntax: INTV xxx yyy<cr> where output interval unit (s, min, h) VAISALA _______________________________________________________________________ 87...

  • Page 90: Form Defining The Output Format

    User's Guide ______________________________________________________________________ Example: >intv 1 min Output interval: 1 MIN > FORM Defining the Output Format Syntax: FORM [amount of decimals] [quantity] [u] [status] [date][time] [addr]<cr> With the FORM command you can determine the output form of commands R and SEND. The following output fields can be defined after the command FORM: The fields can be given in any order, except the unit field U, that can be given only after a quantity or after an error limit value.
  • Page 91 Type DATE to have a date. The date is shown in form of: [date] yyyy-mm-dd. Type TIME to have a time shown. The time is shown in [time] form of: hh:mm:ss. Type ADDR to have the device address (set with the [addr] ADDR command). VAISALA _______________________________________________________________________ 89...
  • Page 92 User's Guide ______________________________________________________________________ OUTPUT MODIFICATION FIELDS Type the text you want inside the quotation marks "text". [text field] Type / to return the factory setting of FORM command. Only alone, without any other specifiers. Type \xxx where xxx is a three digit decimal number of the [ASCII character] character, for example \035 outputs the # character.

  • Page 93: Operational Commands

    Stops the dewpoint measurement and disables the cooling system. PUMP Starting/Stopping the Optional Sample Gas Pump Syntax: PUMP ON/OFF<cr> Example: >pump Pump : OFF > >pump on Pump : ON > >pump off Pump : OFF > VAISALA _______________________________________________________________________ 91...

  • Page 94: Heat Starting/Stopping The Optional Heater

    User's Guide ______________________________________________________________________ HEAT Starting/Stopping the Optional Heater Syntax: HEAT ON/OFF<cr> Example: >heat Heat > >heat on Heat > >heat off Heat > SALT Enables/Disables the Salt Contamination Detection Syntax: SALT ON/OFF [interval]<cr> Default: SALT ON Example: >salt Salt sensing >...

  • Page 95: Scal Starts The Salt Detection Limit Determination Cycle93

    During the test device reports the sensor temperature. When the test is completed, the lowest achievable stable sensor temperature (in current ambient conditions) is reported. Example: >ptest<cr> -12.34 'C<cr> -22.45 'C<cr> -31.32 'C<cr> -35.44 'C ...<cr> -39.34 'C<cr> Cool. capacity: -39.12 'C<cr> > Typing s<cr> interrupts the test. VAISALA _______________________________________________________________________ 93...

  • Page 96: Anal Starts/Stops The Statistical Filtering

    User's Guide ______________________________________________________________________ ANAL Starts/Stops the Statistical Filtering Syntax: ANAL ON/OFF<cr> Type command ANAL ON to turn off the statistical filtering. Command ANAL OFF turns on the statistical filtering. See section Statistical Filtering on page 61 for more information. Example: >anal on Analog mode ???: >anal off...

  • Page 97: Setting Commands

    The unit is set by typing the desired unit(s) after the command UNIT. All the units change form metric to non-metric (or other way round) by typing UNIT m or UNIT n. The display units change simultaneously. VAISALA _______________________________________________________________________ 95...

  • Page 98: Time Setting The Date And Time

    User's Guide ______________________________________________________________________ When you want to have both metric and non-metric temperature units NOTE (C/F) for different quantities, select the units with keypad. The serial command UNIT changes all temperature units either to metric or non-metric. Examples: >unit ? Output units : 'C g/m3 gr/lb kJ/kg bar slpm Selecting non-metric units...

  • Page 99: Asel Setting The Analog Outputs

    1 quantity for the channel 2 quantity for the channel 3 Select the quantity and scaling and set the criteria for enabling the function. See more about the analog outputs from page 75. VAISALA _______________________________________________________________________ 97...

  • Page 100: Aerr Setting The Invalid Output For Analog Channel

    User's Guide ______________________________________________________________________ Use the following quantity abbreviations: TDF/TD/H2O/RH/PW/TW/A/ANTP/X/H/DT/T/P/FLOW/+TDF/ +TD/+PW Enabling criteria keywords: relay is never enabled (inactive) relay is enabled when dewpoint measuring status is STOP STOP relay is enabled when dewpoint measuring status is ERR relay is enabled when dewpoint measuring status is OK relay is enabled when dewpoint measuring status is WAIT WAIT relay is always enabled...

  • Page 101: Cooler Setting The Cooling Method Status

    Example: >flow ? Flow slpm >flow Flow slpm ? 1.5 If the flow setting is frequently adjusted, e.g. by using an external NOTE flow meter as a flow input source, the command XFLOW is recommended. VAISALA _______________________________________________________________________ 99...

  • Page 102: Xflow Setting The Flow Value Temporarily

    User's Guide ______________________________________________________________________ XFLOW Setting the Flow Value Temporarily Syntax: XFLOW x.xxx<cr> where x.xxx = sample air flow value The function of XFLOW is the same as with the command FLOW except that with the command XFLOW the setting is valid only until power is turned off or the command XFLOW is given without parameters.

  • Page 103: Tp Setting The Temperature

    > If the temperature setting is frequently adjusted, e.g. by using an NOTE external thermometer as a temperature input source, the command XTP is recommended. XTP Setting the Temperature Temporarily Syntax: XTP xx.xx<cr> where xx.xx = temperature VAISALA ______________________________________________________________________ 101...

  • Page 104: Adjustments

    User's Guide ______________________________________________________________________ The function of XTP is the same as with the command TP except that with the command XTP the setting is valid only until power is turned off or the command XTP is given without parameters. After this the pressure stored with the command TP is valid again.
  • Page 105 3. measurement : -20.026 <cr> 4. reference : -9.98 <cr> 4. measurement : -9.977 <cr> 5. reference : 0 <cr> 5. measurement : -0.006 <cr> 6. reference : 10 <cr> 6. measurement : 10.002 <cr> 7. reference : 19.99 <cr> VAISALA ______________________________________________________________________ 103...
  • Page 106 User's Guide ______________________________________________________________________ 7. measurement : 19.982 <cr> 8. reference : 29.98 <cr> 8. measurement : 29.989 <cr> 9. reference : 39.98 <cr> 9. measurement : 39.989 <cr> 10. reference : <cr> <cr><lf> Reference Measurement<cr><lf> -39.990 -40.009<cr><lf> -30.010 -30.030<cr><lf> -20.010 -20.026<cr><lf>...

  • Page 107: Fcal Adjusting The Flow Meter (In One Point)

    Press any key when ready ... Set the pressure sensor to the second reference conditions. Wait until the reading is stabilized. Press any key and give the value of the second reference, press ENTER. P2 ( bar ) > VAISALA ______________________________________________________________________ 105...

  • Page 108: Others

    User's Guide ______________________________________________________________________ Others ? Outputting the Device Settings Syntax: ?<cr> ?? Outputting the Device Settings in POLL-State Syntax: ??<cr> DEL Deleting the Data Files Syntax: DEL [file]<cr> where file = 1...(number of the file to be deleted, file numbers are seen with the command DIR) Command DEL without the file number erases all data files! NOTE...

  • Page 109: Help Outputting The Commands

    RUN mode: Continuous output starts automatically from power-up. Output can be defined with the command FORM. Only command S can be used. POLL mode: Allows the communication with multiple transmitters or other digital instruments connected to one serial bus. Only the VAISALA ______________________________________________________________________ 107...

  • Page 110: Open & Close Opening And Closing The Lines

    User's Guide ______________________________________________________________________ commands OPEN addr and SEND addr can be used. The transmitter does not echo in POLL mode. OPEN & CLOSE Opening and Closing the Lines Syntax: OPEN x<cr> where 0...99 (address of the device) Syntax: CLOSE<cr> In STOP-mode: command OPEN has no effect, CLOSE sets the transmitter in POLL-mode.

  • Page 111: Scc Sensor Circuit Check

    Turns the transient recovery ON/off. Examples: >SSC <cr> Status check 24<cr><lf> > >SSC ON <cr> Status check 24<cr><lf> > >SSC ON 15<cr> Status check 15<cr><lf> > SNUM Outputting the Serial Numbers of DM500 and DMP501 Syntax: SNUM<cr> VAISALA ______________________________________________________________________ 109...

  • Page 112: Vers Outputting The Program Name And Version

    User's Guide ______________________________________________________________________ VERS Outputting the Program Name and Version Syntax: VERS<cr> >vers DMI500 / 1.25 DMP501 / 1.04 > 110 _________________________________________________________________ M210205EN-D...

  • Page 113: Mi70 Link Program

    DOWNLOAD FILES the program, press F1 to get menu. HELP Device Name MI70 DM500 The on-line help of MI70 Link uses the name "MI70" for the device. When using the application with DM500, the MI70 means DM500. VAISALA ______________________________________________________________________ 111...

  • Page 114: Displayed Quantities

    User's Guide ______________________________________________________________________ Displayed Quantities When downloading recorded data or using the real-time window, the quantities and units are determined by the current selections in the DM500's "Quantities and units" menu at downloading time. Measurement uncertainty values are shown in own data table columns after quantities Td/f, Td and Pw (if some of these quantities are active).

  • Page 115: Chapter 18 Maintenance

    The sensor is robust and constructed of hard materials. Thus even frequent periodic cleaning of the sensor can be done without any concern of sensor wear down. VAISALA ______________________________________________________________________ 113...
  • Page 116 User's Guide ______________________________________________________________________ Turn off the measuring mode; the sensor must not be cooled. Loosen the three Allen screws of the sensor cap with an Allen key. (Note that the screws have retainers, they do not come off completely). Remove the sensor cap. Remove the sensor cap.

  • Page 117: Error Messages

    Setting up for Operation, page 35. Check that cooling method (air/water) setting is correct, page In case of constant error, please contact Vaisala, see page 19. Please check that the cooling air/water temperatures and flows are correct, see chapter Setting up for Operation, page 35.

  • Page 118: Technical Support

    User's Guide ______________________________________________________________________ Please contact Vaisala, send the device for repair, page 19. Clock battery failure. Please contact Vaisala, send the device for repair, page 19. Please contact Vaisala, send the device for repair, DMI500 selftest page 19. "C/D/F/L" failed. Let the service check the device.
  • Page 119 Please include the Problem Report in the same box. Send the box to: Vaisala Oyj Contact person / Division Vanha Nurmijärventie 21 FIN-01670 Vantaa Finland If only the sensor is faulty, return only the DMP501 sensing unit. VAISALA ______________________________________________________________________ 117...
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  • Page 121: Chapter 19 Specifications

    + 18 ºC T Accuracy standard (traceable to international standards) ±0.2 ºC T optional (traceable to national primary standard) ±0.1 ºC T Typical temperature dependence of measured dewpoint 0.01 ºC/ºC Repeatability (see the following graph) < ±0.05 ºC Td (2Σ) VAISALA ______________________________________________________________________ 119...

  • Page 122: Figure 23 Dewpoint Temperature Measurement Repeatability

    User's Guide ______________________________________________________________________ Specifications + Calibration uncertainty (+2s) Repeatability (+2s) Repeatability (-2s) -0.1 Calibration uncertainty (-2s) -0.2 Specifications - -0.3 -0.4 Dew / Frostpoint [°C] Figure 23 Dewpoint Temperature Measurement Repeatability Response time (see the following graph) Typical Response Time for 5 °C Abrupt Dew / Frostpoint Change (Flow 1.0 slpm) -70 -60 -50 -40 -30 -20 -10 10 20 30 40 50 60...

  • Page 123: External Temperature (Optional)

    Pressure of sample gas 0...20 bar Sample gas flow rate 1.0 slpm Cooling water temperature 0...15 ºC Operating gases Air, N2, Ar, SF6; nontoxic, noncorrosive, nonflammable gases only. Options may have extra restrictions. Electronics housing material aluminium, stainless steel VAISALA ______________________________________________________________________ 121...

  • Page 124: Options For Dmp501

    User's Guide ______________________________________________________________________ Wetted parts' materials Stainless steel (AISI 316L), silicone elastomer, Vectra LCP, tantalum, quartz Housing classification IP31 (NEMA 2) Mechanical piping connections Swagelok 6 mm/ /¼" Storage temperature range -40...+70 ºC Weight 7 kg Minimum heat removal capacity of the cooling water system 250 W @ 5 ºC Options for DMP501...

  • Page 125: Options For Dmi500

    Analog outputs (optional, three channels) 4...20 mA passive Operating voltage 12...28 V ccuracy at +20 ºC (typical) ±0.05% full scale Temperature dependence 0.005 % full scale/ºC Electromagnetic Compatibility Complies with EMC standard EN 61326-1:1997 + Am1:1998; Laboratory Environment Dimensions (in mm) VAISALA ______________________________________________________________________ 123...
  • Page 126 User's Guide ______________________________________________________________________ 124 _________________________________________________________________ M210205EN-D...
  • Page 127 Chapter 19 ____________________________________________________________ Specifications VAISALA ______________________________________________________________________ 125...
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  • Page 129: Appendix Ahumidity Theory

    Thus, atmospheric pressure is actually the sum of the partial pressures of nitrogen, oxygen, water vapor, carbon dioxide, and small amounts of other gases. VAISALA ______________________________________________________________________ 127...

  • Page 130: Saturation Vapor Pressure

    User's Guide ______________________________________________________________________ There are many ways of expressing the water vapor content of a gas. Some water vapor quantities, such as dewpoint temperature, can be measured directly and fundamentally. Other parameters, such as relative humidity, require knowledge of additional information, such as the temperature of the gas.

  • Page 131: Partial Pressure Of Water Vapor (P )

    Figure 25 Partial Pressure of Water Vapor Over Water and Relative Humidity (RH) Relative humidity (RH) is the ratio of the amount of water vapor actually in the air compared to the maximum amount the can be mixed VAISALA ______________________________________________________________________ 129...

  • Page 132: Mixing Ratio (X)

    User's Guide ______________________________________________________________________ in air at that particular temperature. It is defined below as the ratio of the water vapor pressure P to the saturation water vapor pressure P ⋅ Air temperature (ºC) Dewpoint temperature (ºC) Relative humidity (%RH) Figure 26 Water Vapor Saturation Curves Mixing Ratio (x) Mixing ratio (x) is mass of water vapour per unit mass of dry air with...

  • Page 133: Absolute Humidity (A)

    Enthalpy (h) is measure of the total energy in a humid gas. Enthalpy is a function of the gas temperature and pressure, and of the moisture content, since water absorbs energy on changing from condensed state to vapour. VAISALA ______________________________________________________________________ 131...

  • Page 134: Humid Air Volume/Dry Air Volume Ppm

    User's Guide ______________________________________________________________________ . 1 ( 00189 ⋅ ⋅ ⋅ where mixing ratio (g/kg) temperature (ºC) enthalpy Humid Air Volume/Dry Air Volume PPM Parts per million (PPM) by volume is the ratio of the partial pressure of the water vapor to the partial pressure of dry gas. This can be calculated with a reasonable accuracy with following formula: (10) ⋅...
  • Page 135 In practice, condensation may form in sample lines or on interior or exterior parts of the hygrometer. Condensation inside the sample line will cause a measurement error. VAISALA ______________________________________________________________________ 133...
  • Page 138 www.vaisala.com...

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