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Figure 1 Vaisala HUMICAP

â

Dew Point Transmitter DMT132

2.2 Basic Features and Options

• Dew point measurement range -30 ... +50 °C (-22 ... +122 °F) T

d

• Output in T

d/f

or T

d/f

atm (calculated measurement parameter)

• HUMICAP

â

polymer sensor

• Small size to fit in tight installations
• One scalable 2-wire current loop output, 4 ... 20 mA
• Configurable analog output level for error notification
• Field check suitability with MI70 hand-held indicator
• Optional accessories:

• USB service cable for configuration and calibration
• LED indicator plug that enables a visual indication of transmitter status: LED lit when

dew point is above set limit, blinking for malfunction alarm

• Special cover set for HMK15 Humidity Calibrator
• Adapter for mounting on NPT 1/2" threaded mounting points
• Loop-powered display
• Various sampling cells with different installation options

2.3 Transmitter Structure

The structure of the DMT132 is shown in

Figure 2 (page 9)

. The transmitter body does not

have user serviceable parts inside, and is not designed to be opened. Opening the
transmitter will void the warranty.

DMT132 User Guide

M211289EN-B

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Содержание HUMICAP DMT132

Страница 1: ...M211289EN B User Guide Vaisala HUMICAP Dew Point Transmitter DMT132...

Страница 2: ...change without prior notice Local rules and regulations may vary and they shall take precedence over the information contained in this manual Vaisala makes no representations on this manual s complian...

Страница 3: ...rocess 21 3 5 Sampling Accessories for DMT132 21 3 5 1 DMT242SC Sampling Cell 21 3 5 2 DMT242SC2 Sampling Cell with Swagelok Connectors 22 3 5 3 DSC74 Sampling Cell with Quick Connector and Leak Screw...

Страница 4: ...eters 42 4 10 Other Commands 43 4 10 1 Display Command List 43 4 10 2 Reset Transmitter 43 4 10 3 Restore Factory Settings 44 5 Maintenance 45 5 1 Cleaning Transmitter 45 5 2 Changing Filter 45 5 3 Ch...

Страница 5: ...ator Plug 19 Figure 14 Connectors I and II 20 Figure 15 Connector Pinout 20 Figure 16 Sampling Cells DMT242SC2 Left and DMT242SC Right 22 Figure 17 DSC74 Sampling Cell with Accessories 23 Figure 18 DS...

Страница 6: ...nterface Settings 30 Table 6 DMT132 Serial Commands 31 Table 7 Pressure Conversion Coefficients 36 Table 8 Error Codes 60 Table 9 Measurement Performance 63 Table 10 Operating Environment 63 Table 11...

Страница 7: ...perating temperature Patent Notice section removed M211289EN A March 2011 First version 1 2 Related Manuals Table 2 Related Manuals Document Code Name M211288EN Vaisala HUMICAP Dewpoint Transmitter DM...

Страница 8: ...during the task 1 4 Trademarks Vaisala and HUMICAP are registered trademarks of Vaisala Oyj Windows is either a registered trademark or trademark of Microsoft Corporation in the United States and oth...

Страница 9: ...lity and durability against condensation Table 3 DMT132 Measurement Parameters Parameter Abbreviation Metric Unit Non Metric Unit Dew point frost point temperature Td f C F Dew point frost point tempe...

Страница 10: ...service cable for configuration and calibration LED indicator plug that enables a visual indication of transmitter status LED lit when dew point is above set limit blinking for malfunction alarm Spec...

Страница 11: ...hen the transmitter is delivered the filter is protected by a yellow transport protection cap that keeps the sensor dry The transport protection cap should be left on the transmitter during storage Re...

Страница 12: ...need the special cover set Vaisala order code 230914 The cover set includes one salt jar cover where one of the holes is specially designed for the DMT132 and rubber plugs for covering the unused hole...

Страница 13: ...in compressed air lines and other systems with sufficient flow 2 7 Loop Powered Display Optional The DMT132 can be connected to a loop powered external LED display type Nokeval 301 Vaisala order code...

Страница 14: ...20 For the loop resistance of the display refer to the manufacturer s documentation 2 8 Connection Cables Vaisala supplies shielded cables with M8 female straight threaded connector Available in four...

Страница 15: ...re information on performing sampling and a description of the accessories see Sampling Accessories for DMT132 page 21 For order codes of sampling accessories see Spare Parts and Accessories page 66 2...

Страница 16: ...possible to damage the product by delivering an electrostatic discharge when touching removing or inserting any objects inside the equipment housing Avoid touching component contacts or connectors wh...

Страница 17: ...here are oil particles in the system or if oil is collected to the filter over a longer period of time The maximum measurement pressure is 20 bara 290 psia absolute pressure for direct measurement If...

Страница 18: ...the yellow transport protection cap from the transmitter Figure 9 Removing the Transport Protection Cap 2 If you are using the optional NPT adapter apply PTFE tape or suitable paste sealant to the out...

Страница 19: ...leave the sealing ring in place it is always needed to achieve a tight installation Use your hands to turn the transmitter from the 30 mm nut until it feels tight Do not use force at this point and ch...

Страница 20: ...ent tightness is achieved by turning 20 degrees after the point achieved by hand Only tighten the transmitter from the 30 mm nut Do NOT apply force to other points in the transmitter body CAUTION 20 F...

Страница 21: ...it in to connector II of the transmitter and tighten it 9 Turn on the power supply to start up the DMT132 The analog output will stabilize in five seconds after start up 3 3 Wiring The power supply l...

Страница 22: ...Connector Pinout 3 3 1 Power Supply Requirements The DMT132 transmitters are designed to operate with a supply voltage of 10 28 VDC The allowed voltage range depends on the loop resistance RL For RL...

Страница 23: ...f a gas changes the dew point temperature of the gas If the sensor is at a different pressure than the process itself there may be an error of several tens of degrees in the dew point measurement Make...

Страница 24: ...roviding the essential function of cooling the dry air to ambient temperature before it reaches the sensor 3 2 1 1 2 4 Figure 16 Sampling Cells DMT242SC2 Left and DMT242SC Right 1 Male pipe welded con...

Страница 25: ...2 and G3 8 to G1 4 ISO supplied with each DSC74 unit When using the DSC74 seal the threads of the quick connector or thread adapter carefully with PTFE thread seal tape Tighten with an open end wrench...

Страница 26: ...la In the basic operation of the DSC74B the gas flows to the sensor from the front and the outlet is on the side To have the measurement done at atmospheric pressure the inlet and outlet are reversed...

Страница 27: ...rotect the sensor from ambient humidity disturbing the measurement The coil can also be used as a cooling coil for sampling from high temperature processes DSC74C consists of the following parts Sampl...

Страница 28: ...3 4 1 2 Figure 20 Default Assembly of DSC74C 1 Gas goes in The coil can also be used here 2 Gas comes out 3 Coil 4 Valve DMT132 User Guide M211289EN B 26...

Страница 29: ...ansmitter 3 5 4 2 DM240FA Duct Installation Flange The transmitter can be installed directly in the process wall through DM240FA duct installation flange When the transmitter is installed directly on...

Страница 30: ...lation Flange with DMT132 1 Measured gas 2 DMT132 transmitter 3 DM240FA flange thread G1 2 ISO 4 Recommended additional hole plugged for Td field check reference measurement probe for example Vaisala...

Страница 31: ...r on your PC When installing the driver you must acknowledge any security prompts that may appear The driver is compatible with Windows 7 Windows 8 and Windows 10 1 Check that the USB service cable is...

Страница 32: ...ala com software and a USB serial interface cable 1 Connect the USB serial interface cable between your PC and the RS 485 port of the DMT132 connector II 2 Start the PuTTY application 3 Select the Ser...

Страница 33: ...user is in bold type The notation cr refers to pressing the carriage return Enter key on your computer keyboard Enter a cr to clear the command buffer before starting to enter commands Table 6 DMT132...

Страница 34: ...Reset the transmitter SEND Output the reading once SYSTEM Show transmitter software information VERS Show transmitter firmware version 4 4 Device Information and Status 4 4 1 Show Device Information...

Страница 35: ...rmware Version VERS cr Example vers DMT132 1 0 0 2011 01 24 4 4 4 Show Software Information SYSTEM cr Example system Device Name DMT132 Dewpoint transmitter Copyright Copyright c Vaisala Oyj 2011 All...

Страница 36: ...utput scaling in Celsius Must be lower than high limit highlimit The high limit of the output scaling in Celsius Must be higher than low limit Example show current settings asel Quantity TDF Level Lo...

Страница 37: ...log output level range 3 5 30 mA Example show current settings aerr Notification ON Error level 4 20 mA mA 3 800000 Example disable analog output error notification aerr off Notification OFF Saving se...

Страница 38: ...the transmitter is configured to output dew point temperature in atmospheric pressure Td f atm For standard dew point measurement Td f it is enough to set an approximate pressure value 1 bar PRES pp...

Страница 39: ...put Commands 4 7 1 Output a Reading Once Use the SEND command to output a single measurement message The output message is sent for the measurement parameter that is currently selected using the ASEL...

Страница 40: ...utput value range 0 30 mA The output shows the test value of the analog output as well as diagnostic information that may be useful to Vaisala Service Center if there is a problem with the analog outp...

Страница 41: ...d adjustment procedures see Calibration and Adjustment page 47 4 9 1 Calibrate Humidity Measurement Use the RHCAL command to perform a one point or two point humidity RH calibration RHCAL cr When perf...

Страница 42: ...ature reference Run the command and enter the exact temperature of the reference after the measurement has stabilized Exit the command by pressing the ESC key before proceeding to the second point see...

Страница 43: ...TION CRH cr When performing a one point adjustment you need to place the transmitter in a single humidity reference with RH 50 Run the command and enter the exact RH of the reference after the measure...

Страница 44: ...HCAL command T offset and gain adjusted using the CT command Example shows default values no user adjustment done l Cp offset 0 Cp gain 1 RH offset 0 RH gain 1 T offset 0 T gain 1 4 9 5 Set User Adjus...

Страница 45: ...nd List HELP cr Example help AERR ALARM ASEL ATEST CALCS CRH CT ERRS FRESTORE HELP L LI PASS PRES RHCAL RESET SEND SYSTEM VERS 4 10 2 Reset Transmitter When the RESET command is given the transmitter...

Страница 46: ...RESTORE command clears all of the user adjustment parameters including the capacitance offset and gain that are set by the CRH command If you want to avoid having to perform the capacitance adjustment...

Страница 47: ...s make sure that the pressure of the chamber is equalized with the ambient pressure prior to removing the transmitter When the transmitter is removed for maintenance cap the hole with a capped nut Thi...

Страница 48: ...s enough 5 3 Changing Sensor The user can replace the HUMICAP 180R sensor with a new one The new sensor must be of the HUMICAP 180R type Do not attempt to use a different sensor type Replacing the sen...

Страница 49: ...uld be done every year Calibration should also be done if there is a reason to believe that the device is not within the accuracy specifications For accurate calibration disconnect the current loop fr...

Страница 50: ...at is included in the DM70 and HM70 hand held indicator products A calibrated reference probe that is suitable for the intended measurement environment and dew point range DMP74A probe from the DM70 i...

Страница 51: ...nterface menu and change if necessary 7 Write down the Td f reading after the measurement has stabilized 8 Turn off the MI70 indicator and disconnect the DMT132 9 Insert the reference probe to the mea...

Страница 52: ...rence with over 30 RH difference between the two points Even though the transmitter outputs dew point the humidity calibration procedure is performed using relative humidity RH values You can use the...

Страница 53: ...g over the LiCl salt chamber of the humidity calibrator 11 RH Make sure it sits tightly over the salt chamber 8 Insert the DMT132 into the chamber Do not remove the filter Make sure all unused holes a...

Страница 54: ...dy To continue with the calibration of the wet end gain correction press ENTER 13 Insert the DMT132 in the NaCl salt chamber 75 RH Make sure the salt chamber is sealed and the transmitter sits tightly...

Страница 55: ...d to a USB port on your PC 3 Start a terminal application and set the service port connection settings 19200 8 N 1 Remember to check which COM port the USB cable is using 4 Verify that the connection...

Страница 56: ...t time to update the value type the temperature of the reference in degrees Celcius and press ENTER To exit the CT command without adjusting the measurement press the ESC key and exit this procedure 1...

Страница 57: ...ou must perform the two point capacitance adjustment For normal adjustment use the RHCAL command instead CAUTION Write down the current capacitance adjustment parameters visible with the L command so...

Страница 58: ...l connection is working use the L command to see the current user adjustment parameters Write down the Cp offset and gain values so you can restore them manually using the LI command if necessary l 6...

Страница 59: ...on press the ESC key after entering the correction The CRH command will exit and you can move to step 16 RH 11 35423321 Ref1 11 Press any key when ready To continue with the adjustment of the wet end...

Страница 60: ...and to verify that the new user adjustment parameters are in use and write them down for later reference l 17 Use the SEND command to verify that the measurement is OK send Tdf 9 33 C DMT132 User Guid...

Страница 61: ...r transmitter software you can restore the factory configuration of the transmitter by issuing the FRESTORE command If you cannot solve the problem and return the transmitter to the normal state pleas...

Страница 62: ...umidity sensor open circuit not calibrated Condensation on humidity sensor Humidity sensor damaged Humidity sensor short circuit Humidity sensor missing E5 Capacitance out of range Condensation on hum...

Страница 63: ...Error Code Error Message Possible Cause s E18 RH reading too low Internal error E20 Log corrupted Internal error Chapter 6 Troubleshooting 61...

Страница 64: ...DMT132 User Guide M211289EN B 62...

Страница 65: ...7 s 63 40 s 90 3 14 C 37 7 F Td 33 s 63 85 s 90 Calculated Variables Dew point converted to atmospheric pressure Td f atm 1 When dew point is below 0 C 32 F the transmitter outputs frost point Dew poi...

Страница 66: ...ion available for defined dew point limit error state indication RS 485 serial line for service use Table 12 Mechanical Specifications Property Description Value Sensor Vaisala HUMICAP 180R Recommende...

Страница 67: ...sulation PVC Cable diameter 5 0 mm 0 2 in Protection class IP67 NEMA 4 Wire color code EN50044 7 1 Dimensions 2 5 12 45 80 5 125 5 6 36 G1 2 ISO 228 1 3 3 AW 30 R19 5 Figure 29 DMT132 Dimensions 20 5...

Страница 68: ...ample cells DMT242SC DMT242SC2 DSC74 DSC74B DSC74C DMCOIL Duct installation flange DM240FA Cables several lengths available HMP50Z032 HMP50Z300SP HMP50Z500SP HMP50Z1000SP Loop powered external display...

Страница 69: ...of Sale for details of the warranty for each product Technical Support Contact Vaisala technical support at helpdesk vaisala com Provide at least the following supporting information Product name mod...

Страница 70: ...DMT132 User Guide M211289EN B 68...

Страница 71: ......

Страница 72: ...www vaisala com...

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