USER'S GUIDE Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70 M010091EN-F
PUBLISHED BY Vaisala Oyj P.O. Box 26 FIN-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at http://www.vaisala.com/ © Vaisala 2007 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. The contents are subject to change without prior notice.
________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION............................................................................ 6 Safety......................................................................................... 6 General Safety Considerations ............................................. 6 Feedback................................................................................... 6 Recycling .......................
USER'S GUIDE____________________________________________________________________ Auto-Calibration...................................................................27 Automatic Auto-Calibration.............................................27 Turning off Automatic Auto-Calibration ..........................28 Manual Auto-Calibration.................................................28 Sensor Purge.......................................................................29 Turning on/off Automatic Sensor Purge ...
________________________________________________________________________________ Changing the Battery ..................................................... 57 Changing the Filter......................................................... 59 Changing the Fuses ....................................................... 60 CHAPTER 8 MEASURING MOISTURE IN SF6 GAS-INSULATED EQUIPMENT ........... 61 Overview ................................................................................. 61 Operating Environment ..
USER'S GUIDE____________________________________________________________________ MI70 Indicator......................................................................85 Indicator General............................................................85 Battery Pack ...................................................................86 DMP74 Probe + MI70 Indicator = Vaisala DRYCAP® DM70 Hand-Held Dewpoint Meter .................................................86 General............................................
________________________________________________________________________________ List of Tables Table 1 Table 2 Measurement Intervals and Maximum Recording Times......... 33 List of Accessories ...................................................................
USER'S GUIDE____________________________________________________________________ CHAPTER 1 GENERAL INFORMATION Safety General Safety Considerations Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning alerts you to a serious hazard. If you do not read and follow instructions very carefully at this point, there is a risk of injury or even death. CAUTION Caution warns you of a potential hazard.
Chapter 1 ________________________________________________________ General Information Recycling Recycle all applicable material. Dispose of batteries and the unit according to statutory regulations. Do not dispose of with regular household refuse. Trademarks DRYCAP® is a registered trademark of Vaisala. Microsoft®, Windows®, and Windows NT® are registered trademarks of Microsoft Corporation in the United States and/or other countries.
USER'S GUIDE____________________________________________________________________ Warranty Vaisala hereby represents and warrants all Products manufactured by Vaisala and sold hereunder to be free from defects in workmanship or material during a period of twelve (12) months from the date of delivery save for products for which a special warranty is given.
Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW Introduction to Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70 DM70 measures dewpoint temperature accurately in a measurement range from -60 °C up to +60 °C depending on the probe version. DM70 incorporates the advanced DRYCAP® technology, which enables reliable and high-performance dewpoint measurement.
USER'S GUIDE____________________________________________________________________ DM70 consists of two main units: the MI70 indicator and DMP74 probe, versions A, B, or C. DM70 can be used with the optional sampling cell to measure process dewpoint. With DSS70A, DM70 forms a part of a complete portable sampling system for measuring process dewpoint. Basic Features and Options DM70 has the following basic features and options: - Numerical and graphical multilingual displays. - Data recording possibility.
Chapter 2 __________________________________________________________ Product Overview Parts Description 0403-031 Figure 1 Hand-Held Dewpoint Meter DM70 The following numbers refer to Figure 1 above.
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Chapter 3 ____________________________________________________ Preparations Before Use CHAPTER 3 PREPARATIONS BEFORE USE Installing and Removing the Battery Pack NOTE If you have previously used a battery pack, put the metal contact at the lower end of the batteries before installing the alkaline batteries. If DM70 is ordered with a battery pack, it is already installed at the factory. 1. Unscrew the back plate of the indicator. 2. Remove the old batteries.
USER'S GUIDE____________________________________________________________________ Do not push the connector with any conducting material. See Figure 2 on page 13. NOTE NOTE If you have previously used alkaline batteries, remove the metal contact before installing the battery pack. 4. Replace the battery pack, close the back plate, and tighten the screw. 5. Charge the battery before use. Old batteries must be disposed of according to the local laws and regulations.
Chapter 3 ____________________________________________________ Preparations Before Use Buttons and Navigation To turn on the device, press the Power On/Off button. To open menus, press an arrow button and then press the shortcut buttons. To activate a function shown above the shortcut button, press the shortcut button. To navigate in the menus, press arrow buttons. 0403-033 Figure 3 Buttons The following numbers refer to Figure 3 above.
USER'S GUIDE____________________________________________________________________ 8. NOTE If you want to set the date at this point, return to the Settings menu by pressing . The language can be selected also later. See section Language on page 37. 9. To change the date, select Date and press Set. Then change the date using the buttons. To confirm the selection, press Select. As a default, the date format is year-month-day You can select from two other alternative formats. 10.
Chapter 4 _____________________________________________________ Dewpoint Measurement CHAPTER 4 DEWPOINT MEASUREMENT The following recommendations should be taken into account when measuring in very dry environments. - A clean environment is always best for humidity measurements. - The number of connections should be minimized to avoid leaks. - The flow rate must be adequate. - Dead ends must be avoided as they cannot be flushed easily.
USER'S GUIDE____________________________________________________________________ 3. Install the probe to the measuring position. If you are measuring in pressurized processes, see section Connection to Pressurized Processes Using the DSC74 Sampling Cell on page 52. When using other sampling cells than DSC74, make sure that the threads are compatible with the probe threads (G ½" ISO228/1). Be careful not to damage the sintered filter when installing the probe. 4.
Chapter 5 _____________________________________________________________ User Interface CHAPTER 5 USER INTERFACE This chapter contains information that is needed to operate this product. Basic Display When DM70 is turned on, the display shown in Figure 4 below appears. 0403-034 Figure 4 Basic Display The following numbers refer to Figure 4 above. 1 2 = = The state of the battery. Pressure settings.
USER'S GUIDE____________________________________________________________________ 3 = 4 = 5 = 6 = Selected quantities. Up to three of the following quantities can be selected at a time: dewpoint (Td/f, Td ), relative humidity (RH), absolute humidity (a), mixing ratio (x), parts per million (H2O), temperature (T). The Graphic1) shortcut button changes the display into a curve mode. The Hold/Sa1) shortcut button holds the display and allows you to save the reading into the memory.
Chapter 5 _____________________________________________________________ User Interface 0403-035 Figure 5 Menus Display Menu Quantities and Units You can select 1 ... 3 display quantities at a time. The unit of quantities (Td/f, Td, or T) can be selected between °C or °F. The default is °C.
USER'S GUIDE____________________________________________________________________ NOTE 1. Open the menu by pressing Open. 2. Select Display and press 3. Select Quantities and units and then press 4. To select a quantity, move on the desired quantity using the arrow buttons and then press Select. 5. To change the unit, move on the desired quantity using the arrow buttons and then press Unit (°C or °F). 6.
Chapter 5 _____________________________________________________________ User Interface NOTE 4. To turn rounding on (=a one-decimal display), press On. To turn rounding off (=a two-decimal display), press Off. 5. To return to the basic display, press Exit. Rounding does not affect the measurement accuracy. Accuracy is defined in Chapter 11 on page 81. Hold/Save With the Hold/Save function you can hold a selected display reading and save it into the memory. Several readings can be saved.
USER'S GUIDE____________________________________________________________________ The graphical display shows the curve of the uppermost quantity shown in the basic display. 1. Open the menu by pressing Open. 2. Select 3. To go to the Graphical history display, select Graphic history Show. and press 4. To get the statistical info on the graph area (minimum, Info. maximum, and average values), press 5. To get the curve of the other selected quantities, press Next.
Chapter 5 _____________________________________________________________ User Interface 4. Select Quantity and press Set to select the quantity. 5. Select the quantity and press Select. Only one active quantity can be selected at a time. To change which quantities are active, go to Menu - Display - Quantities and units. 6. Select the first limit and press Set (if the alarm function is on, turn it off). Use the arrow buttons to set the alarm level.
USER'S GUIDE____________________________________________________________________ Analog Output Selecting and Scaling the Analog Output 0403-052 Figure 8 Analog Output To get analog measurement data, an analog signal cable is needed (see section Accessories on page 89). 1. Connect the signal cable connector of the analog output to the base connector of the indicator. Connect the screw terminal block as follows: Brown wire: common wire (-) Yellow-green wire: signal (+) 2. Open the menu by pressing 3.
Chapter 5 _____________________________________________________________ User Interface 10. To deactivate analog output, go to Menu - Functions Analog output - Analog output on/off and press Off. Auto-Calibration To obtain the best possible accuracy in measurements taken in dry environments, DM70 has a built-in, automatic calibration. During the auto-calibration, DM70 adjusts the dry-end reading to correspond to the calibrated values.
USER'S GUIDE____________________________________________________________________ Turning off Automatic Auto-Calibration NOTE If the automatic auto-calibration is turned off, the auto-calibration should be started when starting measuring after the probe has not been used for a while and always at least once every hour. The automatic auto-calibration can be turned off as follows: Open. 1. Open the menu by pressing 2. Select Settings and press 3. Select Measurement settings and press 4.
Chapter 5 _____________________________________________________________ User Interface 0403-045 Figure 9 Auto-Calibration Displays Sensor Purge Sensor purge feature is only available in the DMP74B/C probe. The purge should be carried out to achieve the shortest response times and the best long-term stability. Sensor purge is an automatic procedure, in which the sensor is dried. Thus, the sensor will response very fast when installing the probe from an ambient to a dry gas.
USER'S GUIDE____________________________________________________________________ The purge is performed automatically if humidity changes significantly or quickly and if the dewpoint is low enough. As a default, the automatic sensor purge is turned on automatically in DM70. It is recommended not to turn it off. The automatic sensor purge can also be started manually, which is necessary if the purge has not been performed during the last 24 hours.
Chapter 5 _____________________________________________________________ User Interface 3. Select Measurement settings and press . 4. Select Purge interval and press 5. Set the desired purge interval with the arrow buttons. Press OK to confirm. 6. To return to the basic display, press Set. Exit.
USER'S GUIDE____________________________________________________________________ You can also change one of the shortcut keys to refer to the sensor purge. See section Program Shortcut Keys on page 38. Calibrate Transmitters (used only with DMP248) In this menu, you can set the baud rate, serial format, and start calibration. For details, refer to Chapter 6, Field Calibration Check of Fixed Transmitters, on page 43.
Chapter 5 _____________________________________________________________ User Interface 3. To change the recording interval, select Interval and press Set. 4. Select the measurement interval with the arrow buttons. The measurement intervals and the maximum recording times are shown in Table 1 on page 33.
USER'S GUIDE____________________________________________________________________ Stopping Recording 1. To stop recording, press Record. 2. Select 3. Then select Start/Stop recording and press 4. To view the recorded file, select Record data and press . Stop. Show. View Recorded Data 1. Open the menu by pressing Open. 2. Select Recording/Viewing and press . 3. Select View recorded data and press . 4. Select the file you want to view and press .
Chapter 5 _____________________________________________________________ User Interface Clear Data Memory The data memory can be cleared as follows: 1. Open the menu by pressing 2. Select 3. Select Clear data memory and press deletion, press Yes. 4. To return to the basic display, press Open. Recording/Viewing and press . Clear. To confirm the Exit. Transferring Recorded Data to PC The recorded data can be transferred to a PC using the MI70 Link program.
USER'S GUIDE____________________________________________________________________ Environment Menu Pressure Settings In pressurized environments, the actual process pressure value must be set for DM70. The pressure can be given in the following units: Pbarg: Gauge pressure is given in the unit of bar. It indicates the pressure difference between the normal atmospheric pressure and the actual process pressure. Pbara: Absolute process pressure is given in the unit of bar.
Chapter 5 _____________________________________________________________ User Interface Settings Menu User Interface 0403-038 Figure 14 User Interface Language You can select any of the following languages for the user interface: English, Finnish, Chinese, Russian, Japanese, Swedish, French, German, or Spanish. To select the language, follow the instructions below: 1. Open the menu by pressing Open. 2. Select Settings and then press 3. Select User interface and then press 4.
USER'S GUIDE____________________________________________________________________ Automatic Power Off As a default, the power in DM70 is automatically turned off after 15 minutes of inactivity. This also saves the battery. The inactivity settings can be changed to 60 minutes or completely turned off. See the instructions below: 1. Open the menu by pressing Open. 2. Select Settings and press 3. Select User interface and press 4. Select Auto power off and press 5.
Chapter 5 _____________________________________________________________ User Interface 0403-039 Figure 15 Hold/Save Replaced by Auto Cal Button Tones and Backlight You can turn on or off the sound effects for the buttons and the back light. Follow the instructions below: 1. Open the menu by pressing 2. Select 3. Select User interface and press 4. To turn on or off the sound effect, select Key Click and then On/Off. press 5.
USER'S GUIDE____________________________________________________________________ 3. Select Date and time and press . 4. For the desired date, select Date and then press Set. Use the arrow buttons to change the date. Confirm the selection by pressing Select. To change the date format, select from the alternatives and press Select. 5. Set. Use the For the desired time, select Time and press arrow buttons to change the time. To confirm the selection, press OK.
Chapter 5 _____________________________________________________________ User Interface The default values are 28.96 for DMP74A/B (air) and 146.06 for DMP74C (SF6). Purge Interval The time interval at which the automatic sensor purge is performed can be changed between 1 ... 48 hours. For instructions, refer to section Changing Automatic Sensor Purge Interval on page 30. Device Information 0403-040 Figure 17 Device Information Basic information about the indicator and the probe is found as follows: 1.
USER'S GUIDE____________________________________________________________________ 0403-041 Figure 18 Indicator and Probe Information The following numbers refer to Figure 18 above. 1 2 3 4 5 = = = = = Software version of the MI70 indicator Serial number of the MI70 indicator Probe type Software version of the probe Serial number of the probe Factory Settings The factory settings can be restored to clear all the changed settings and data memory of the indicator.
Chapter 6 ____________________________________ Field Calibration Check of Fixed Transmitters CHAPTER 6 FIELD CALIBRATION CHECK OF FIXED TRANSMITTERS To compare measurement readings or to read the output of a fixed transmitter directly on the DM70 display, connect DM70 to a fixed Vaisala transmitter using the connection cable accessories. Vaisala DRYCAP® Dewpoint and Temperature Transmitter Series DMT340 can be adjusted in laboratory conditions using DM70 as a reference.
USER'S GUIDE____________________________________________________________________ 3. If you are requested to check the environment settings, press Yes. Then check the pressure settings. To set the ambient pressure, see section Pressure Settings on page 36. 4. Check that the pressure units of DM70 and DMT340/DMT242/DM142 are the same. If not, and you are checking DMT242/DMT142, change the DM70 pressure unit to bara by pressing Unit on the corresponding row.
Chapter 6 ____________________________________ Field Calibration Check of Fixed Transmitters 1. Connect the cable between DMP248 (connector X5, 6-pin connector on the left of the motherboard) and DM70 (connector I or II). Turn on both the devices. 2. Open the menu by pressing 3. Select Functions and press 4. Select Calibrate transmitters and press 5. Select 1. Baud rate and 2.Serial format. To change the serial settings, press Set. The serial settings of DMP248 and DM70 must be the same.
USER'S GUIDE____________________________________________________________________ 11. Wait until the readings are stabilized (can take one hour in very low dewpoints). If the difference between the dewpoint readings is less than 3 ºC, there is no immediate need for adjustment. However, in applications where best possible accuracy is essential, it is recommended to send the DMP248 transmitter to Vaisala (see section Vaisala Service Centers on page 78) if the difference is considered significant. 12.
Chapter 7 ____________________________________________________Sampling from Processes CHAPTER 7 SAMPLING FROM PROCESSES When the dewpoint of a process needs to be measured using DM70, the process can be sampled using one of the following devices: - DSC74 - DSC74B - DSC74C - DSS70A - DMT242SC - DMT242SC2 Use the DSC74 sampling cell when the sample is taken from the pressurized process, where the process pressure forces the sample gas into the sample cell. Use the DSC74B sampling cell as DSC74.
USER'S GUIDE____________________________________________________________________ Sampling Cells DSC74 - sampling cell with a leakage screw, thread 3/8"G - quick coupling, type NIP08, type D - thread adapter, type 3/8" - 1/4"G - thread adapter, type 3/8" - 1/2"G (for DMP248 and DMT242 fittings) 0403-047 Figure 20 DSC74 Sampling Cell with the Adapters The following numbers refer to Figure 20 above.
Chapter 7 ____________________________________________________Sampling from Processes DSC74B - sampling cell, thread 3/8"G - connection part with a needle valve and an integrated leakage screw - Reducing Nipple (thread adapter), 3/8"G - 1/2"G - Reducing Adapter (thread adapter), 3/8"G - 1/4"G 0403-111 Figure 21 DSC74B The following numbers refer to Figure 21 above.
USER'S GUIDE____________________________________________________________________ 0403-112 Figure 22 Default Assembly of DSC74C The following numbers refer to Figure 22 above. 1 2 3 4 = = = = Gas goes in. Also the coil can be used here.
Chapter 7 ____________________________________________________Sampling from Processes 0403-113 Figure 23 Alternative Assembly of DSC74C for Tight Spaces The following numbers refer to Figure 23 above. 1 2 3 4 5 = = = = = Gas comes out Coil Thread, max. size 7 mm Gas goes in Valve The thread size cannot exceed 7 mm. Use the provided adapter to avoid damage to the probe.
USER'S GUIDE____________________________________________________________________ DMT242SC DMT242SC is a sampling cell with threads 3/8"G and 1/4"G. See Figure 24 on page 52. DMT242SC2 DMT242SC2 is a sampling cell with 1/4" welded Swagelok connectors. See Figure 24 below.
Chapter 7 ____________________________________________________Sampling from Processes To make the connection, follow the instructions below: 1. Select the quick connector or thread adapter according to your process fitting. 2. Check that the pressure setting is correct. For details, see section Pressure Settings on page 36. 3. Make sure that the valve of the sampling cell is open. First close the valve, then turn it halfway open again.
USER'S GUIDE____________________________________________________________________ 8. Set the probe into the sample cell. Tighten the probe by turning it from the thread nut. Do not tighten the probe from the handle. 9. If the sample cell is installed correctly, there is no leakage in the connections. You can test this by closing the valve temporarily. By using the quick connector, the process pressure can be maintained during the installation or removal of the sampling cell.
Chapter 7 ____________________________________________________Sampling from Processes The DSS70A sampling system can be ordered from Vaisala separately or in connection with the Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70. 0403-048 Figure 25 DM70 with the Case The following numbers refer to Figure 25 on page 55.
USER'S GUIDE____________________________________________________________________ (1.2 ... 20 bar), detach the flexible tube from the flowmeter. See Figure 25 on page 55. 3. Remove the inlet/outlet plugs. 4. Insert the 1/4" tubing into the IN fitting. Tighten the nut 11/4 turns with an open-ended, 14-mm spanner to make a gas-tight fitting. In future, only slight tightening with an open-ended spanner is needed to make a gas-tight fitting. Insert the tubing into the OUT fitting, if needed. 5.
Chapter 7 ____________________________________________________Sampling from Processes 1. Detach the MI70 recharger adapter from the socket of the sampling system and plug in the recharger provided with DM70. 2. Disconnect the recharger when the battery is full and put the MI70 recharger back into the case. If you want to recharge the sampling system and MI70 at the same time, connect the MI70 recharger adapter to the recharger socket on top of MI70 and recharge DSS70A as described above.
USER'S GUIDE____________________________________________________________________ 2. Turn the sampling system upside down. See Figure 27 below. 0403-050 Figure 27 Sampling System Upside Down The following numbers refer to Figure 27 above. 1 2 3 3. NOTE Battery Battery wires Nut of the sample cell Detach the battery wires. Remove the old battery by pulling it up. The battery is attached to its place with double-sided tape.
Chapter 7 ____________________________________________________Sampling from Processes 7. Put the system back into the briefcase. Changing the Filter The filter should be changed regularly as a part of maintenance. However, the need for changing the filter depends on how dirty the process is. The filter may need to be changed after several hundreds of hours or after years. A dry filter may cause increased response times. A new filter can be ordered from Vaisala (see section Accessories on page 89). 1.
USER'S GUIDE____________________________________________________________________ Changing the Fuses Press down the fuse button and simultaneously turn it. Replace the old fuse with a new one of same type and rating (glass tube fuse 5 x 20 mm T 2 A/250 VAC). Put the fuse button back into place by pressing and turning it.
Chapter 8 ____________________________Measuring Moisture in SFB6B Gas-insulated Equipment CHAPTER 8 MEASURING MOISTURE IN SF6 GASINSULATED EQUIPMENT Overview Sulfur Hexafluoride (SF6) is an inert, insulating gas of high dielectric strength and thermal stability. SF6 is used to insulate high voltage lines, circuit breakers, and other equipment used in transmission and distribution of electricity. Measuring moisture is crucial for the maintenance of SF6 equipment.
USER'S GUIDE____________________________________________________________________ 0405-011 Figure 29 Gas Collection Option The following numbers refer to Figure 29 above. 1 2 = = Gas from GIE Gas to the collecting system Operating Environment A typical dewpoint of pure SF6 is usually around -60 °C. The recommendations for the moisture limit of the equipment insulated with gas (GIE) vary between 70 ... 810 ppmv, which corresponds to -45 ... -22 °C Td/f in the atmospheric pressure, or -29 ...
Chapter 8 ____________________________Measuring Moisture in SFB6B Gas-insulated Equipment With DSC74B, the dewpoint can be measured at the GIE pressure. If the measurement is done in the GIE pressure, DM70 is able to show the corresponding dewpoint in the atmospheric pressure. DSC74B limits the flow rate with a leakage screw. The flow rate is optimized for GIE pressures between 3 ... 10 barg, and no external flow meter is needed.
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Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance CHAPTER 9 CALIBRATION, ADJUSTMENT, AND MAINTENANCE Calibration DM70 is fully calibrated and adjusted as shipped from the factory. The typical calibration interval is one year. Calibration must always be done when there is reason to believe that the device is not within the accuracy specifications.
USER'S GUIDE____________________________________________________________________ Adjusting DM70 The reference condition of the dewpoint must be traceable to the appropriate standards. The user adjustment requires a stable humidity generator capable of producing the required humidities and a calibrated reference dewpoint meter. For adjustment, the probe and the reference dewpoint meter are connected to the humidity generator output, the reference condition is adjusted and let to stabilize.
Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance Adjusting Dewpoint Before adjusting dewpoint, first carry out the two-point, relative humidity calibration, which will ensure the basic adjustment level. When adjusting the DMP74B or DMP74C probe or DMT340 series transmitters with the M-sensor, do the sensor purge before calibration and adjustment. For details, see section Sensor Purge on page 29.
USER'S GUIDE____________________________________________________________________ NOTE 7. 8. To select the adjustment method, press Adjust. Select 2-point adjustment and press Select. Then press OK to continue. 9. Set the probe to a lower reference value of relative humidity 1). You can follow the stabilization from the graph display by Graph. When the reading has stabilized, press pressing Ready. 10. Use the arrow buttons to give the lower reference value of relative humidity. Then press OK. 11.
Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance For DMT340 M-sensor, humidity references of 0 % (for example Nitrogen) and 10 ... 20 % are required. NOTE For the DMT340 M-sensor both reference humidities must be below 20 %RH. To make the adjustment, follow the instructions below: 1. Turn off DM70. 2. Connect the cable 211339 between DMT340 (service port) and DM70 (connector I or II). Turn on both the devices. 3.
USER'S GUIDE____________________________________________________________________ 12. Confirm the adjustment by pressing Yes. If you press the adjustment display returns and no changes are made. No, 13. Now the adjustment is completed. To exit the adjustment mode, press Back. 14. To return to the basic display, press Exit.
Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance NOTE 6. To select 1-point adjustment, press Select. Adjust and then 7. When the reading has stabilized at the reference level, press Ready. 8. Use the arrow buttons to give the reference value. Then press OK. 9. Confirm the adjustment by pressing Yes. If you press No, the adjustment mode display returns and no changes are made. 10. Wait until the automatic auto-calibration has taken place. 11.
USER'S GUIDE____________________________________________________________________ Graph. The minimum recommended stabilization time for this critical adjustment is 5 hours. 4. Perform the manual purge if necessary. 5. Press the ADJ button on the DMT340 motherboard to enable the adjustment mode. 6. From the list of parameters, select Td/f I/II 7. You are prompted to check the settings, make sure that the pressure units of DM70 and DMT340 are the same.
Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance 17. Place the screw back onto the calibration button. 18. To seal the calibration, attach a sticker on the calibration button. NOTE Several AutoCals can be necessary after this adjustment has been performed until the transmitter reaches full accuracy. 1-Point Adjustment NOTE This adjustment method allows the customer to manually enter the reference value when making the adjustment. 9.
USER'S GUIDE____________________________________________________________________ Adjusting Temperature Temperature Adjustment of DM70 The temperature adjustment can be done using the one-point or twopoint adjustment. The one-point adjustment should be done within the temperature range in which the device is most often used. To go to the adjustment mode, do the following: 1.
Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance Two-Point Adjustment NOTE 1. After selecting 2-point adjustment, press continue. Select to 2. Set the probe to a lower reference temperature. You can follow the stabilization from the graphical display by pressing Graph. When the reading has stabilized, press Ready. 3. Use the arrow buttons to give the lower reference temperature value and then press OK. 4. Set the probe to a higher reference temperature.
USER'S GUIDE____________________________________________________________________ 4. From the list of parameters, select TI/II 5. At this point you need to select the adjustment method. If the reference probe is connected, two options are displayed: To same as TI/II, 1-point adjustment or 2-point adjustment. 6. You are prompted to check the settings, make sure that the pressure units of DM70 and DMT340 are the same. If not, change the unit by pressing Unit on the corresponding row.
Chapter 9 _______________________________________ Calibration, Adjustment, and Maintenance 2-Point Adjustment 7. After selecting 2-point adjustment, press continue. 8. Set the probe to a lower reference temperature. You can follow the stabilization from the graphical display by pressing Graph. When the reading has stabilized, press Ready. 9. Use the arrow buttons to give the lower reference temperature OK. value and then press Select to 10. Set the probe to a higher reference temperature.
USER'S GUIDE____________________________________________________________________ Vaisala Service Centers 78 __________________________________________________________________ M010091EN-F
Chapter 10 ___________________________________De-commissioning, Dismantling, and Disposal CHAPTER 10 DE-COMMISSIONING, DISMANTLING, AND DISPOSAL WARNING Contaminated parts can be detrimental to health and environment. Before beginning to work, find out whether any of the parts especially the probe, filter, or sampling cell - have been contaminated (radioactive, toxic, caustic, or contains a biological hazard, etc.) during the measurement process.
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Chapter 11 ____________________________________________________ Technical Specifications CHAPTER 11 TECHNICAL SPECIFICATIONS Measured Variables Dewpoint Temperature Measurement range DMP74A DMP74B DMP74C Accuracy -50 ... +60 ˚C (-58 ... +140 ˚F) -70 ... +30˚C (-94 ... +86 ˚F) -70 ... +30˚C (-94 ... +86 ˚F) ±2 ˚C (±3.6 ˚F), see Figure 31, Figure 32, and Figure 33 on page 82. Dewpoint range for ±2 ˚C.
USER'S GUIDE____________________________________________________________________ 0602-003 Figure 31 DMP74A Accuracy 0602-004 Figure 32 DMP74B Accuracy 0602-005 Figure 33 DMP74C Accuracy 82 __________________________________________________________________ M010091EN-F
Chapter 11 ____________________________________________________ Technical Specifications DMP74A Response time: 63 % (90 %) at flow rate 0.2 m/s, 1 bar absolute pressure, +20 ˚C 0 Æ-40 ˚C Td (32 Æ40 ˚F Td) 20 s (120 s) -40 Æ0 ˚C Td (-40 Æ32 ˚F Td) 10 s (20 s) DMP74B/C Response time: 63 % (90 %) at flow rate 0.
USER'S GUIDE____________________________________________________________________ Absolute Humidity (DMP74A Probe Recommended) Measurement range (typical) 0.5 ... 100 g/m3 (0.2 ... 40 gr/ft3) Accuracy ± (0.2 g/m3 + 10 % of reading) ± (0.1 gr/ft3 + 10 % of reading) Mixing Ratio (DMP74A Probe Recommended) Measurement range (typical) 0.2 ... 100 g/kg (2 ... 700 gr/lbs) Accuracy ± (0.1 g/kg + 12 % of reading) ± (0.
Chapter 11 ____________________________________________________ Technical Specifications Probe General Sensor DMP74A DMP74B/C Probe material (wetted parts) Sensor protection Mechanical connection Housing classification Storage temperature Storage humidity Weight Vaisala DRYCAP® 180S Vaisala DRYCAP® 180M Stainless steel (AISI 316L) Sintered filter, (AISI 316L), part No. HM47280SP G1/2" ISO2281 thread with bonded seal ring (U-seal) IP65 (NEMA4) -40 ... +70 ˚C 0 ...
USER'S GUIDE____________________________________________________________________ Analog output Output resolution Accuracy Temperature dependence Minimum load resistor 0 ... 1 VDC 0.6 mV 0.2 % full scale 0.002 %/˚C full scale 10 kohm to ground Data interface Data logging capacity Logging interval Logging duration RS232C (EIA-232) 900 ... 2700 real time data points 1 s to 12 h 1 min ...
Chapter 11 ____________________________________________________ Technical Specifications Electromagnetic Compatibility Complies with the following standard: EN61326-1:1997 +Am 1:1998, Electrical equipment for measurement, control, and laboratory use EMC requirements: Generic environment.
USER'S GUIDE____________________________________________________________________ Material Weight Stainless steel AISI316 390 g DSC74C DSC74C is a sampling cell with DSC74B with DMCOIL cooling/venting coil.
Chapter 11 ____________________________________________________ Technical Specifications Fuse ratings Glass tube fuse 5x20 mm T 2A/250 VAC (Manufacturer: Littlefuse 218002) Accessories Table 2 List of Accessories Description AC Adapters Order Code Euro AC adapter UK AC adapter US AC adapter AUS AC adapter MI70 All adapter MI70EUROADAPTER MI70UKADAPTER MI70USADAPTER MI70AUSADAPTER MI70ALLADAPTER Sampling cell Sampling cell with Swagelok connectors Sampling cell for pressurized gases Two pressure samp
USER'S GUIDE____________________________________________________________________ Dimensions 0403-055 Figure 34 Dimensions in Millimeters (Inches) W Warranty 8 90 __________________________________________________________________ M010091EN-F
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