Vaisala Drycap DMT142, User Manual

Page 1: ...USER S GUIDE Vaisala DRYCAP Dewpoint Transmitter DMT142 M210397EN D...

Page 2: ...echanical 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...

Page 3: ...CT OVERVIEW 3 Introduction to Dewpoint Transmitter DMT142 3 The Basic Features and Options 3 CHAPTER 3 FUNCTIONAL DESCRIPTION 5 Advanced DRYCAP Technology 5 Auto Calibration 5 Sensor Purge 6 Sensor Wa...

Page 4: ...est Analog Output Current 25 Test Analog Voltage Output 25 Restart Program 25 Serial Line Output Commands 26 Start Measurement Output 26 Stop Measurement Output 26 Set Output Interval 26 Polling Mode...

Page 5: ...Figure 10 DMT142 Installed Directly to Pipeline 13 Figure 11 DMT242SC Sampling Cell 14 Figure 12 DMT242SC2 Sampling Cell with Swagelok Connectors 15 Figure 13 DSC74 Sampling Cell with Accessories 16 F...

Page 6: ...ser s Guide _______________________________________________________________________ 4 ____________________________________________________________________ M210397EN D This page intentionally left blan...

Page 7: ...nt Transmitter DMT142 Contents of This Manual This manual consists of the following chapters Chapter 1 General Information provides general notes for the manual and the product Chapter 2 Product Overv...

Page 8: ...technical support Chapter 8 Technical Data provides the technical data of Dewpoint Transmitter DMT142 Version Information Table 1 Manual Revisions Manual Code Description M210397EN A Vaisala DRYCAP D...

Page 9: ...refully at this point the product could be damaged or important data could be lost NOTE Note highlights important information on using the product Feedback Vaisala Customer Documentation Team welcomes...

Page 10: ...e of with regular household refuse Regulatory Compliances Vaisala DRYCAP Dewpoint Transmitter DMT142 complies with the following performance and environmental test standards Electromagnetic Compatibil...

Page 11: ...part shall should Vaisala so require be sent to the works of Vaisala or to such other place as Vaisala may indicate in writing freight and insurance prepaid and properly packed and labelled unless Va...

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Page 13: ...sensor technology The DRYCAP technology has low maintenance needs due to its excellent long term stability and durability against condensation The DMT142 transmitter is easy to install and the mechani...

Page 14: ...ing cells with different installation options available as DMT142 installation accessories 1 2 3 4 5 6 7 8 0507 093 Figure 1 Dewpoint Transmitter DMT142 Components The following numbers refer to Figur...

Page 15: ...ieved with microprocessor technology and software that automatically performs self diagnostic functions in addition to the normal dewpoint measurement The self diagnostic procedures that are conducted...

Page 16: ...ay or when the power is switched on The sensor is heated for several minutes which will then evaporate all excess molecules out of the sensor polymer This together with the auto calibration results in...

Page 17: ...on that is intended to help you install Dewpoint Transmitter DMT142 Selecting Location In the mounting of Dewpoint Transmitter DMT142 it is important that the point of installation represents well the...

Page 18: ...r protective cap 2 Fit the sealing washer onto the probe 3 Mount the transmitter to the measurement point The transmitter has parallel thread G1 2 ISO 228 1 4 Connect the wires of the connection cable...

Page 19: ...rown VDC supply voltage 2 White analog output signal sense voltage output versions only 3 Blue VDC supply voltage 4 Black analog output signal 1 4 2 3 12 28V V 0507 095 Figure 3 Wiring of Voltage Outp...

Page 20: ...th two types of connection cables snap on type or with screw fitting locking Table 4 Description of DMT142 Connection Cable Property Description Value M8 Female straight connector molded sensor cable...

Page 21: ...te with a supply voltage of 12 28 VDC voltage output version or 18 28 VDC current output version When measuring in pressures 20 50 bara 290 725 psia or temperatures 40 0 C 40 32 F a supply voltage of...

Page 22: ...le Of Sensor Purge Current at Room Temperature with 24 VDC Typical duty cycle Sensor purge current varies with supply voltage and operating temperature The peak value is the highest in the lowest temp...

Page 23: ...ng from the process is easy by using Vaisala sampling cell options Direct Measurement in Process Pipeline Direct installation to the measured gas is the recommended installation method if the temperat...

Page 24: ...the process and the measurement cell must be taken into account in calculating the dewpoint The dewpoint measurement with the DRYCAP sensor is not flow sensitive but the flow rate affects the respons...

Page 25: ...rs The following number refers to Figure 12 above 1 Swagelok 1 4 connectors DSC74 Sampling Cell with Quick Connector and Leak Screw Vaisala DSC74 sampling cell allows quick and easy connection of the...

Page 26: ...3 above 1 Thread adapter type 3 8 G 1 2 G 2 Thread adapter type 3 8 G 1 4 G 3 Quick connector 4 Leak screw 5 Sampling cell DMT242SC When using the DSC74 seal the threads of the quick connector or thre...

Page 27: ...B can be used as the DSC74 for measurements in process pressure DSC74B limits the flow rate with a leak screw The maximum flow can also be increased by removing the leak screw and adjusting the flow m...

Page 28: ...ling Cell with Coil The DSC74C is mechanically like the DSC74B but it is supplied with a coil for measurements in atmospheric pressure The coil can also be used as a cooling coil for sampling from hig...

Page 29: ...______________________________________________ 19 0403 113 Figure 17 Alternative Assembly of DSC74C for Tight Spaces The following numbers refer to Figure 17 above 1 Gas comes out 2 Coil 3 Thread max...

Page 30: ...flange When the probe is installed directly on the process wall or pipe note that a closing valve may be needed on both sides of the installed probe so that the sensor head can be removed from the pr...

Page 31: ...42 serial interface cable Vaisala order code DMT142RS 1 Connect the serial cable between your PC and DMT142 serial port 2 Open the terminal program 3 Set the serial settings see the following table Ta...

Page 32: ...ature Td in either Celsius or Fahrenheit degrees depending on the unit selection Syntax UNIT n cr Select Metric Unit Syntax UNIT m cr Scale Dewpoint Analog Output Syntax ASCL x yy zz cr where x 0 zero...

Page 33: ...analog output mode of a current output version of the transmitter is always 4 20 mA Syntax AMODE n0 n1 cr where n0 channel 0 analog output mode 0 or 1 0 0 1 V 1 0 5 V n1 0 channel 1 analog output mod...

Page 34: ...t measurement The worst case is considered to be the dewpoint temperature Td at its lowest limit with the widest possible pressure setting difference Syntax PRES pppp pp cr where pppp pp absolute pres...

Page 35: ...rom the analog output Syntax ITEST aa aaa x cr where aa aaa current mA x 0 zero Example itest 4 56 0 4 56000 D78 0 00000 0 Test Analog Voltage Output The operation of the analog voltage output can be...

Page 36: ...23 058 14 426 58 278 23 035 14 406 where in the first column relative humidity RH in the second column ambient temperature C or F in the third column dewpoint C or F Outputting the results continues...

Page 37: ...when the specific transmitter address is called on the serial line Note that using the DMT142 serial output requires the DMT142RS serial line cable Set Transmitter Address Syntax ADDR n cr where n add...

Page 38: ...____________________________________ M210397EN D OPEN Opening the Transmitter in POLL State Syntax OPEN nn cr where nn address 0 99 Resulting only in POLL state DMT nn line opened for operator command...

Page 39: ...n the accuracy specifications A simple field checking operation can be performed by comparing the readings of the DMT142 and the DM70 hand held dewpoint meter with a calibrated reference probe For the...

Page 40: ...sensor This is easily corrected by changing or cleaning the filter CAUTION Touching the sensor may damage it Take special care to avoid touching the sensor when removing and replacing filters To repla...

Page 41: ...r state error state value for the analog voltage output is 0V Serial output in error state serial line outputs asterisk characters to indicate an error sate In the case of an error reset the transmitt...

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Page 43: ...nt range 80 60 C 112 140 F Td see graph on page 34 Standard version 60 60 C 76 140 F Td Analog output scalings option 1 option 2 option 3 80 20 C 112 68 F Td 60 40 C 76 104 F Td free scaling Accuracy...

Page 44: ...o effect on measurement accuracy Measured gases noncorrosive gases 1 For extended temperature down to 40 C 40 F or pressure up to 50 bara 725 psia the supply voltage must be 24 28 VDC Table 9 Output S...

Page 45: ...ccuracy 2 years Operating voltage with current output with voltage output 18 28 VDC 12 28 VDC Supply current during measurement during auto calibration during sensor purge 10 mA load current max 220 m...

Page 46: ...h thread locking HMP50Z500 Shielded M8 output cable 5 m with thread locking HMP50Z1000 Shielded M8 output cable 10 m with thread locking DMT142RS RS232 serial line service cable 211917ZZ Connection ca...

Page 47: ...________________________________________________________________________ 37 Dimensions in mm inches 0507 107 Figure 20 DMT142 Dimensions Wiring Quick Reference Wiring of the connector 1 VDC supply bro...

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