Vaisala Drycap DMT142 User manual

USER'S GUIDE
Vaisala DRYCAP® Dewpoint Transmitte
r
DMT142
M210397EN-D

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2006
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.
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
Sale.

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Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................5
About This Manual...................................................................5
Contents of This Manual.......................................................5
Version Information...............................................................6
Related Manuals ...................................................................6
General Safety Considerations.............................................7
Feedback...............................................................................7
Product Related Safety Precautions ......................................7
Recycling ..................................................................................8
Regulatory Compliances.........................................................8
Electromagnetic Compatibility...............................................8
Trademarks...............................................................................8
Warranty....................................................................................9
CHAPTER 2
PRODUCT 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 Warming in High Humidities .....................................6
CHAPTER 4
INSTALLATION..............................................................................................7
Selecting Location ...................................................................7
Wiring ........................................................................................9
Optional Connection Cable.................................................10
Power Supply Requirements...............................................11
Mounting .................................................................................13
Direct Measurement in Process Pipeline............................13
Sampling from Pressurized Processes...............................14
DMT242SC Sampling Cell.............................................14
DMT242SC2 Sampling Cell with Swagelok
Connectors.....................................................................15
DSC74 Sampling Cell with Quick Connector and Leak
Screw .............................................................................15
DSC74B Two-Pressure Sampling Cell ..........................17
DSC74C Two-Pressure Sampling Cell with Coil ...........18
DM240FA Duct Installation Flange................................20

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CHAPTER 5
SERIAL COMMANDS ..................................................................................21
Connecting Serial Interface...................................................21
Commands for Basic Settings ..............................................22
Select Nonmetric Unit..........................................................22
Select Metric Unit ................................................................22
Scale Dewpoint Analog Output ...........................................22
Select Analog Output Quantity............................................22
Set Analog Output Mode.....................................................23
DMT142 Firmware Version Output......................................23
Pressure Compensation......................................................24
Test 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 for DMT142 Transmitter..................................27
Set Transmitter Address......................................................27
Set Serial Interface Mode....................................................27
OPEN Opening the Transmitter in POLL-State...................28
SEND Outputting a Reading Once......................................28
CHAPTER 6
MAINTENANCE............................................................................................29
Calibration and Adjustment...................................................29
Filter Change...........................................................................29
Vaisala Service Centers.........................................................30
CHAPTER 7
TROUBLESHOOTING..................................................................................31
Error States .............................................................................31
Technical Support ..................................................................31
CHAPTER 8
TECHNICAL DATA ......................................................................................33
Specifications .........................................................................33
Spare Parts and Accessories................................................36
Dimensions in mm (inches)...................................................37
Wiring Quick Reference.........................................................37

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List of Figures
Figure 1 Dewpoint Transmitter DMT142 Components.............................4
Figure 2 Mounting Dewpoint Transmitter DMT142 ..................................8
Figure 3 Wiring of Voltage Output Version...............................................9
Figure 4 Wiring of Current Output Version...............................................9
Figure 5 Pin Order of DMT142 Connector (Transmitter Side) ...............10
Figure 6 Snap-On Type Cable................................................................11
Figure 7 Screw Fitting Type Cable.........................................................11
Figure 8 Example Of Sensor Purge Current (at Room Temperature with
24 VDC)....................................................................................12
Figure 9 Example of Auto-Calibration Current (at Room Temperature
with 24 VDC) ............................................................................12
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
Figure 14 DSC74B....................................................................................17
Figure 15 Removing the Leak Screw .......................................................17
Figure 16 Default Assembly of DSC74C..................................................18
Figure 17 Alternative Assembly of DSC74C (for Tight Spaces)...............19
Figure 18 DM240FA with DMT142...........................................................20
Figure 19 DMT142 Dewpoint Measurement Accuracy Graph .................34
Figure 20 DMT142 Dimensions................................................................37
List of Tables
Table 1 Manual Revisions.......................................................................6
Table 2 Related Manuals ........................................................................6
Table 3 Wiring Table ...............................................................................9
Table 4 Description of DMT142 Connection Cable...............................10
Table 5 DMT142 Serial Interface Setting..............................................21
Table 6 Pressure Conversion Coefficients............................................24
Table 7 Measured Variable...................................................................33
Table 8 Operating Environment Specifications.....................................34
Table 9 Output Specifications ...............................................................34
Table 10 General Specifications .............................................................35

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Chapter 1 _________________________________________________________ General Information
VAISALA_________________________________________________________________________ 5
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and the product.
About This Manual
This manual provides information for installing, operating, and
maintaining Dewpoint 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 Overview, introduces the features and
advantages of Dewpoint Transmitter DMT142.
- Chapter 3, Functional Description, describes the advanced
functionality of Dewpoint Transmitter DMT142, including the
auto-calibration, sensor purge and sensor warming functions.
- Chapter 4, Installation, provides you with information that is
intended to help you install Dewpoint Transmitter DMT142.

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- Chapter 5, Serial Commands, contains the operating instructions
for the serial interface of Dewpoint Transmitter DMT142.
- Chapter 6, Maintenance, provides information that is needed in
basic maintenance of Dewpoint Transmitter DMT142, and contact
information for Vaisala Service Centers.
- Chapter 7, Troubleshooting, describes the error states and provides
contact information for 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®Dewpoint
Transmitter DMT142 Advanced User
Manual, April 2003
M210397EN-B Vaisala DRYCAP®Dewpoint
Transmitter DMT142 User's Guide,
October 2005
Td measurement and operating
pressure range specification revised
New sampling cell, installation flange
and connection cable options added
M210397EN-C Vaisala DRYCAP®Dewpoint
Transmitter DMT142 User's Guide,
March 2006; this manual
Corrected wiring diagrams
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M210396EN-A Vaisala DRYCAP®Dewpoint
Transmitter DMT142 Quick
Reference Guide

Chapter 1 _________________________________________________________ General Information
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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. If you do not read and
follow instructions carefully 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 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: [email protected]
Product Related Safety Precautions
The Dewpoint Transmitter DMT142 delivered to you has been tested
for safety and approved as shipped from the factory. Note the
following precautions:
CAUTION Do not modify the unit. Improper modification can damage the
product or lead to malfunction.

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Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.
Regulatory Compliances
Vaisala DRYCAP® Dewpoint Transmitter DMT142 complies with
the following performance and environmental test standards:
Electromagnetic Compatibility
EN 61326-1:1997 + Am1:1998, Electrical equipment for
measurement, control and laboratory use - EMC requirements -
Industrial environment.
[CISPR16/22 Class B, EN/IEC 61000-4-2, EN/IEC 61000-4-3,
EN/IEC 61000-4-4, EN/IEC 61000-4-5, EN/IEC 61000-4-6]
Trademarks
DRYCAP®is a registered trademark of Vaisala.