Vaisala DMT340 User Manual
USER'S GUIDE
Vaisala DRYCAP ® D ew poi nt and
Temperature Transmitter S eries
DMT340
M210704EN-G
PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FI-00421 Helsinki
Finland
Visit our Internet pages at www.vaisala.com.
© Vaisala 2013
No part of this manual may be reproduced, published or publicly displayed in any form
or by any means, electronic or mechanical (including photocopying), nor may its
contents be modified, translated, adapted, sold or disclosed to a third party without prior
written permission of the copyright holder. Translated manuals and translated portions
of multilingual documents are based on the original English versions. In ambiguous
cases, the English versions are applicable, not the translations.
The contents of this manual are subject to change without prior notice.
This manual does not create any legally binding obligations for Vaisala towards
customers or end users. All legally binding obligations and agreements are included
exclusively in the applicable supply contract or the General Conditions of Sale and
General Conditions of Service of Vaisala.
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Table of Contents
CHAPTER 1
GENERAL INFORMATION .......................................................................... 11
About This Manual ................................................................. 11
Contents of This Manual ..................................................... 11
Version Information ............................................................. 12
Documentation Conventions ............................................... 12
Safety ....................................................................................... 13
ESD Protection .................................................................... 13
Recycling ................................................................................ 13
Regulatory Compliances ....................................................... 14
EU Declaration of Conformity .............................................. 14
Transmitters with LAN or WLAN Interface .......................... 14
Transmitters with WLAN Interface ...................................... 15
Patent Notice .......................................................................... 15
Trademarks ............................................................................. 15
Software License .................................................................... 15
Warranty .................................................................................. 16
CHAPTER 2
PRODUCT OVERVIEW ................................................................................ 17
Introduction to DMT340 ......................................................... 17
Basic Features and Options ................................................ 19
Structure of the Transmitter ................................................ 20
Probe Options ..................................................................... 22
CHAPTER 3
INSTALLATION ............................................................................................ 23
Mounting the Housing ........................................................... 23
Standard Mounting without Moun t ing Pla te ........................ 23
Wall Mounting with Wall Mounting Kit ................................. 24
Mounting with DIN Rail Installation Ki t ................................ 26
Pole Installation with Installation Kit for Pole or Pipeline .... 27
Mounting the Rain Shield with Installation Kit ..................... 28
Panel Mounting Frame ........................................................ 28
Wiring ...................................................................................... 30
Cable Bushings ................................................................... 30
Grounding the Cables ......................................................... 31
Transmitter Housing Grounding .......................................... 32
Signal and Power Supply W iring ......................................... 32
Connections to a 24 VAC Power Supply ............................ 34
Probe Mounting ...................................................................... 35
DMT342 Small-size Flanged Probe for Use with
Sampling Cell ...................................................................... 35
DMT344 For High-pressure Applications ............................ 37
DMT347 Small Pressure-tight Probe .................................. 39
Pressure-Tight Swagelok Installation Kits for DMT347....... 39
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DMT348 For Pressurized Pipelines ..................................... 41
Tightening the Clasp Nut ..................................................... 42
Ball Valve Installation Kit for DMT348 ................................. 44
Leak Screw Installation........................................................ 46
Mounting the Probe Directly to the Proces s ........................ 47
Sampling Cell for DMT348 .................................................. 49
Optional Modules.................................................................... 51
Power Supply Module.......................................................... 51
Installation ...................................................................... 52
Warnings ........................................................................ 53
Galvanic Isolation of the Power Supply ............................... 56
Installation ...................................................................... 56
Third Analog Output ............................................................ 56
Installation and Wiring .................................................... 57
Alarm Relays ....................................................................... 58
Installation and Wiring .................................................... 58
Selecting the Activation State of the Relay .................... 58
RS-422/485 Interface .......................................................... 60
Installation and Wiring .................................................... 61
LAN Interface ....................................................................... 64
WLAN Interface ................................................................... 65
Attaching the WLAN Antenna......................................... 66
Data Logger Module ............................................................ 66
8-Pin Connector ................................................................... 68
CHAPTER 4
OPERATION ................................................................................................. 69
Getting Started ........................................................................ 69
Display/Keypad ....................................................................... 70
Basic Display ....................................................................... 70
Graphic History .................................................................... 71
Menus and Navigation ......................................................... 73
Changing the Language ................................................. 74
Rounding Setting ............................................................ 74
Display Backlight Setting ................................................ 74
Display Contrast Setting ................................................. 75
Using Display/Keypad ............................................... 75
Using Serial Line ....................................................... 75
Keypad Lock (Keyguard) ................................................ 75
Menu PIN Lock ............................................................... 76
Factory Settings ................................................................... 76
Display Alarms ..................................................................... 77
Configuring a Display Alarm ........................................... 78
Using Serial Line ............................................................ 79
MI70 Link Program for Data Handling .................................. 81
Serial Line Communication ................................................... 82
User Port Connection .......................................................... 83
User Port Operating Modes ............................................ 83
Service Port Connection ...................................................... 84
Connection Cables ......................................................... 84
Installing the Driver for the USB Cable .......................... 84
Using the Service Port .................................................... 85
LAN Communication .............................................................. 85
IP Configuration ................................................................... 86
Using Display/Keypad .................................................... 87
Using Serial Line ............................................................ 88
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Wireless LAN Configuration ................................................ 89
Using Display/Keypad .................................................... 90
Using Serial Line ............................................................ 91
Communication Protoco l ..................................................... 92
Web Configuration for LAN and WLAN ............................... 92
Terminal Program Settings ................................................. 93
Opening a Serial/USB Connectio n ................................. 94
Opening a Telnet Session (LAN/WLAN) ........................ 95
List of Serial Commands ..................................................... 96
Getting the Measurement Message from Serial Line ......... 99
Starting Continuous Outputting ...................................... 99
Stopping Continuous Outputting .................................... 99
Outputting Reading Once ............................................ 100
Assign an Alias for the SEND Command .................... 100
Outputting Reading Once From All Transmitters ......... 101
Communicating with a Transmitter in POLL Mode ........... 101
OPEN ........................................................................... 101
CLOSE ......................................................................... 101
Formatting Serial Line Mess age ....................................... 102
FTIME and FDATE....................................................... 102
FST............................................................................... 102
General Settings ................................................................... 103
Changing the Quantities and Units ................................... 103
Using Display/Keypad .................................................. 103
Using Serial Line .......................................................... 104
FORM ........................................................................... 104
UNIT ............................................................................. 105
Pressure Compensation Setting ....................................... 106
Using Display/Keypad .................................................. 106
Using Buttons on the Motherboard .............................. 107
Using Serial Line .......................................................... 107
XPRES and PRES .................................................. 107
Date and Time ................................................................... 108
Using Display/Keypad .................................................. 108
Using Serial Line .......................................................... 109
Data Filtering ..................................................................... 109
FILT .............................................................................. 110
Device Information ............................................................ 111
LIGHT ........................................................................... 112
HELP ............................................................................ 113
ERRS ........................................................................... 113
MODS .......................................................................... 113
VERS ........................................................................... 114
Resetting the Transmitter Using Serial Line ..................... 114
RESET ......................................................................... 114
Locking Menu/Keypad Using Serial Line .......................... 114
LOCK ........................................................................... 114
Serial Output Settings .......................................................... 115
Using Display/Keypad ....................................................... 115
Using Serial Line ............................................................... 116
SERI ............................................................................. 116
SMODE ........................................................................ 117
ADDR ........................................................................... 117
INTV ............................................................................. 118
SDELAY ....................................................................... 118
ECHO ........................................................................... 118
Data Recording ..................................................................... 119
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Selecting the Data Recording Quantities .......................... 119
DSEL ............................................................................ 119
View Recorded Data .......................................................... 120
DIR ............................................................................... 120
PLAY ............................................................................ 121
Deleting the Recorded Files .............................................. 122
UNDELETE .................................................................. 122
Analog Output Settings ....................................................... 123
Changing the Output Mode and Range............................. 123
Analog Output Quantities .................................................. 124
AMODE/ASEL .............................................................. 125
Analog Output Tests .......................................................... 126
ITEST ........................................................................... 126
Analog Output Fault Indication Setting .............................. 127
AERR ............................................................................ 127
Extend Analog Output Range ............................................ 128
Operation of Relays .............................................................. 128
Quantity for Relay Output .................................................. 128
Measurement-Based Relay Output Modes ....................... 128
Relay Setpoints ............................................................ 128
Hysteresis ..................................................................... 130
Relay Indicating Transmitter Error Status ......................... 130
Enabling/Disabling the Re l a ys ........................................... 132
Operation of the Indication LEDs ...................................... 132
Setting the Relay Outputs ................................................. 133
RSEL ............................................................................ 134
Testing the Operation of Relays ........................................ 135
RTEST .......................................................................... 135
Sensor Functions ................................................................. 136
AutoCal .............................................................................. 136
Automatic AutoCal ........................................................ 136
Manual AutoCal ............................................................ 137
Sensor Purge ..................................................................... 137
Starting and Configuring Sensor Purge............................. 138
Using Display/Keypad (Optional) ................................. 138
Using Serial Line .......................................................... 139
PURGE .................................................................... 139
PUR ......................................................................... 139
Sensor Warming ................................................................ 140
CHAPTER 5
MODBUS .................................................................................................... 141
Overview of Modbus Protocol Support .............................. 141
Taking Modbus into Use .................................................... 142
Enabling Serial Modbus ....................................................... 143
Using Display/Keypad (Optional) ...................................... 143
Using Serial Line ............................................................... 143
Enabling Ethernet Modbus .................................................. 144
Using Display/Keypad (Optional) ...................................... 144
Using Serial Line ............................................................... 146
Diagnostic Modbus Counters .............................................. 147
Viewing Counters Using Display/Keypad .......................... 147
Viewing Counters Using Service Port ............................... 147
Disabling Modbus ................................................................. 148
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CHAPTER 6
MAINTENANCE ......................................................................................... 149
Periodic Maintenance .......................................................... 149
Cleaning ............................................................................ 149
Changing the Probe Filter ................................................. 149
Calibration and Adjustment ............................................... 149
Error States ....................................................................... 150
Technical Support ................................................................ 152
Product Returns ................................................................... 152
CHAPTER 7
CALIBRATI O N AND AD JUSTMENT ......................................................... 153
Calibration ............................................................................. 153
User Calibration and Adjustment ...................................... 153
Opening and Closing the Adjustment Mode ..................... 154
Adjustment Information ..................................................... 155
CTEXT and CDATE ..................................................... 155
Adjusting Dewpoint T
....................................................... 156
d/f
Two-Point Relative Humidity Adjustment using
Display/Keypad ................................................................. 156
Two-Point Relative Humidity Adjustment using
Serial Line ......................................................................... 158
One-Point Dewpoint Adjustment using Display/Keypad ... 158
One-Point Dewpoint Adjustment using Serial Line ........... 160
Adjusting Temperature ........................................................ 161
Adjusting Temperature using Display/Keypad .................. 161
Adjusting Temperature using Serial Line .......................... 162
CT................................................................................. 162
Adjusting Analog Outputs ................................................... 163
Adjusting Analog Outputs using Display/Keypad .............. 163
Adjusting Analog Outputs us ing Seri al Line ...................... 164
ACAL ............................................................................ 164
CHAPTER 8
TECHNICAL DATA .................................................................................... 165
Specifications ....................................................................... 165
Performance ...................................................................... 165
Operating Environm ent ..................................................... 166
Inputs and Outputs ............................................................ 166
Mechanics ......................................................................... 167
Probe Specifications ......................................................... 167
Technical Specifications of Optional Modules .................. 168
Power Supply Module .................................................. 168
Analog Output Module ................................................. 168
Relay Module ............................................................... 168
RS-485 Module ............................................................ 169
LAN Interface Module .................................................. 169
WLAN Interface Module ............................................... 169
Data Logger Module..................................................... 169
Spare Parts and Accessories .............................................. 170
Dimensions (mm/inch) ......................................................... 172
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APPENDIX A
CALCULATION FORMULAS ..................................................................... 177
APPENDIX B
MODBUS REFERENCE ............................................................................. 181
Function Codes..................................................................... 181
Register Map ......................................................................... 182
Data Encoding ................................................................... 182
32-Bit Floating Point Format ......................................... 182
16-Bit Integer Format ................................................... 183
Measurement Data (Read-Only) ....................................... 184
Status Registers (Read-Only) ........................................... 185
Configuration Registers ..................................................... 185
Exception Status Outputs .................................................... 186
Diagnostic Sub-Functions ................................................... 187
Device Identification Objects .............................................. 188
Exception Responses .......................................................... 188
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List of Figures
Figure 1 Transmitter Body ...................................................................... 20
Figure 2 Inside the Transmitter ............................................................... 21
Figure 3 Probe Options .......................................................................... 22
Figure 4 Standard Mounting ................................................................... 23
Figure 5 Mounting with Wall Mounting Kit .............................................. 24
Figure 6 Dimensions of the Plastic Mountin g Plat e (mm/inch) ............... 24
Figure 7 Mounting with Metal Wall Mounting Plate ................................ 25
Figure 8 Dimensions of Metal Mounting Plate (mm/inch) ...................... 25
Figure 9 Mounting with DIN Rail Installation Ki t ..................................... 26
Figure 10 Vertical Pole ............................................................................. 27
Figure 11 Horizontal Pole ......................................................................... 27
Figure 12 Mounting the Rain Shield with Installation Kit .......................... 28
Figure 13 Panel Mounting Frame ............................................................. 29
Figure 14 Panel Mounting Dimensions (mm/inch) ................................... 29
Figure 15 Cable Bushings ........................................................................ 30
Figure 16 Grounding the Screen of Electrical Cable ................................ 31
Figure 17 Screw Terminal Block on the Motherboard .............................. 32
Figure 18 Connections to 24 VAC Power Supply ..................................... 34
Figure 19 DMT342 Installation (without the Sampling Cell) ..................... 35
Figure 20 HMP302SC Optional Sampling Cell ......................................... 36
Figure 21 DMT344 Probe ......................................................................... 37
Figure 22 Tightening the Nut .................................................................... 37
Figure 23 Cleaning of the Tightening Cone .............................................. 38
Figure 24 DMT347 Probe with Swagelok Installation Kit ......................... 39
Figure 25 DMT347 Probe Installation to Pipeline with Swagelok
Installation Kit ........................................................................... 39
Figure 26 DMT348 Probe ......................................................................... 41
Figure 27 Leak Screw in the DMT348 Probe ........................................... 41
Figure 28 Sealing of Fitting Body into Process ........................................ 42
Figure 29 Tightening the Clasp Nut .......................................................... 43
Figure 30 Installing the DMT348 Probe Through a Ball Valve Assembly 44
Figure 31 Probe in Leak Screw Installation .............................................. 46
Figure 32 DM240FA with Probe ............................................................... 47
Figure 33 Example of Installing the Probe Directly on the Process Pipe . 48
Figure 34 Sampling Cells DMT242SC2 and DMT242SC......................... 49
Figure 35 Installing the Probe in High Temperatures ............................... 50
Figure 36 Power Supply Module .............................................................. 51
Figure 37 Galvanic Isolation Module ........................................................ 56
Figure 38 Third Analog Output ................................................................. 56
Figure 39 Third Analog Output Sel ect ion ................................................. 57
Figure 40 Relay Module ........................................................................... 59
Figure 41 RS-422/485 Module ................................................................. 60
Figure 42 4-Wire RS-485 Bus .................................................................. 62
Figure 43 2-Wire RS-485 Bus .................................................................. 63
Figure 44 LAN Interface Module ............................................................... 64
Figure 45 WLAN Interface Module ........................................................... 65
Figure 46 Data Logger Module ................................................................. 67
Figure 47 Pinout of the Optional 8-Pin Connector .................................... 68
Figure 48 Basic Display ............................................................................ 70
Figure 49 Graphical Display ..................................................................... 71
Figure 50 Graphical Display with Data Logger ......................................... 72
Figure 51 Main Views ............................................................................... 73
Figure 52 Alarm Limits Shown on Graph Screen ..................................... 77
Figure 53 Display Alarm Active ................................................................ 77
Figure 54 Display Alarms ......................................................................... 78
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Figure 55
Modifying an Alarm Limit .......................................................... 78
Figure 56 Service Port Connector and User Port Terminal on the
Motherboard ............................................................................. 82
Figure 57 Connection Example between PC Serial Port and User Port .. 83
Figure 58 Network Interface Menu ........................................................... 87
Figure 59 IP Configuration Menu .............................................................. 87
Figure 60 Wireless LAN Settings .............................................................. 90
Figure 61 Entering Network SSID ............................................................. 90
Figure 62 Selecting the Wireless Network Type ....................................... 90
Figure 63 Web Configuration Interface for WLAN .................................... 93
Figure 64 Opening a Serial Connection .................................................... 94
Figure 65 Opening a Telnet Connection ................................................... 95
Figure 66 Pressure Set Buttons on the Motherboard ............................. 107
Figure 67 Device Information on Display ............................................... 111
Figure 68 Current/Voltage Switches of Output Modules ........................ 123
Figure 69 Measurement-Based Relay Output Modes ............................ 129
Figure 70 FAULT/ONLINE STATUS Relay Output Modes ..................... 131
Figure 71 Relay Availab i lity..................................................................... 133
Figure 72 Following AutoCal on the Display ........................................... 137
Figure 73 Sensor Purge Settings ............................................................ 138
Figure 74 Performing Sensor Purge ....................................................... 138
Figure 75 Serial Interface Settings ......................................................... 143
Figure 76 IP Configuration ...................................................................... 145
Figure 77 Wireless LAN Settings ............................................................ 145
Figure 78 Communication Protoco l ........................................................ 145
Figure 79 Modbus Counters ................................................................... 147
Figure 80 Error Indicator and Error Message ......................................... 150
Figure 81 Starting the Adjustment .......................................................... 156
Figure 82 Performing Purge.................................................................... 156
Figure 83 Following the RH Trend on Graphical Display ....................... 157
Figure 84 Ending Adjustment of Point 1 ................................................. 157
Figure 85 Proceeding to Adjustment of Point 2 ...................................... 157
Figure 86 Completing Adjustment of Point 2 .......................................... 157
Figure 87 Following Stabilizatio n ............................................................ 159
Figure 88 Proceeding with T
Figure 89 Completing T
Adjustment ............................................ 159
d/f
Adjustment .................................................... 159
d/f
Figure 90 Dewpoint Accuracy Graph ...................................................... 165
Figure 91 DMT340 Transmitter Body Dimensions.................................. 172
Figure 92 WLAN Antenna Dimensions ................................................... 173
Figure 93 Sampling Cell Dimensions ...................................................... 173
Figure 94 DMT342 Probe Dimensions ................................................... 174
Figure 95 DMT344 Probe Dimensions ................................................... 174
Figure 96 DMT347 Probe Dimensions ................................................... 175
Figure 97 DMT348 Standard Probe Dimensions .................................... 175
Figure 98 NPT 1/2" Nut Dimensions ....................................................... 176
Figure 99 DMT348 Optional 400mm Probe Dimensions ........................ 176
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List of Tables
Table 1 Manual Revisions ..................................................................... 12
Table 2 Quantities and Their Abbreviations .......................................... 18
Table 3 Optional Quantities and Their Abbreviations............................ 18
Table 4 DMT348 Probe Dimensions ..................................................... 42
Table 5 Connecting the Twisted Pair Wires to the Screw Terminals .... 61
Table 6 4-Wire (Switch 3: On) ............................................................... 62
Table 7 2-Wire (Switch 3: Off) ............................................................... 63
Table 8 Observation Periods and R es olut io n ........................................ 66
Table 9 Wiring of the Optional 8-Pin Connector .................................... 68
Table 10 Periods for Trend and Max/Min Calculations ........................... 71
Table 11 Graph Information Messages ................................................... 72
Table 12 ALSEL Parameters ................................................................... 80
Table 13 Default Serial Communication Settings for the User Port ........ 83
Table 14 Communication Settings for the Service Port .......................... 85
Table 15 IP Settings for the LAN and WLAN Interfaces ......................... 86
Table 16 Wireless LAN Settings .............................................................. 89
Table 17 Measurement Commands ........................................................ 96
Table 18 Formatting Commands ............................................................. 96
Table 19 Data Recording Commands ..................................................... 97
Table 20 Purge Commands .................................................................... 97
Table 21 Autocalibration Commands ...................................................... 97
Table 22 Calibration and Adjustment Commands ................................... 97
Table 23 Setting and Testing the Analog Outputs .................................. 97
Table 24 Setting and Testing the Relays ................................................ 97
Table 25 Other Commands ..................................................................... 98
Table 26 FORM Command Modifiers.................................................... 104
Table 27 Conversion Factors for Pressure Units .................................. 108
Table 28 Filtering Levels ....................................................................... 109
Table 29 Selection of Output Modes ..................................................... 117
Table 30 Relay State Examples ............................................................ 132
Table 31 Supported Modbus Variants ................................................... 141
Table 32 Error Messages ...................................................................... 151
Table 33 Indicator Led Functions .......................................................... 154
Table 34 Standard Probe Cable Lengths and Approximate
Transmitter Weight (in kg/lb) .................................................. 167
Table 35 Spare Parts and Accessories ................................................. 170
Table 36 Supported Function Codes..................................................... 181
Table 37 DMT340 Modbus Register Blocks .......................................... 182
Table 38 Measurement Data Registers................................................. 184
Table 39 Status Registers ..................................................................... 185
Table 40 Configuration Parameter Registers ........................................ 185
Table 41 Configuration Flag Registers .................................................. 186
Table 42 DMT340 Exception Status Outputs ........................................ 186
Table 43 DMT340 Modbus Diagnostics ................................................ 187
Table 44 DMT340 Modbus Device Identification .................................. 188
Table 45 DMT340 Modbus Exception Responses ................................ 188
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Chapter 1 _________________________________________________________ General Information
CHAPTER 1
GENERAL INFORM ATION
About This Manual
This manual provides information for installing, operating, and
maintaining Vaisala DRYCAP® Dewpoint and Temperature Transmitter
Series DMT340.
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, advantages, and
the product nomenclature of the DMT340.
- Chapter 3, Installation, provides you with information that is intended
to help you install the product.
- Chapter 4, Operation, contains information that is needed to operate
the product.
- Chapter 5, Modbus, contains information that is needed when
operating the transmitter using the Modbus protocol.
- Chapter 6, Maintenance, contains information that is needed in basic
maintenance of the product.
- Chapter 7, Calibration and Adjustment, provides information and
instructions concerning the calibration and adjustment of the
DMT340.
- Chapter 8, Technical Data, provides the technical data of the product.
- Appendix A, Calculation Formulas, presents the equations used for
the calculated output quantities.
- Appendix B, Modbus Reference, describes the Modbus functions and
data of the transmitter.
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Manual Code
Description
M210704EN-G
December 2013. This manual. Added new
Various small corrections.
M210704EN-F
Previous version. Applicable from transmitter
temperature range.
Warning alerts you to a serious hazard. If you do
instructions very carefully at this point, there is a risk of injury or even
death.
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
i
Note highlights important information on using the product.
Version Information
Table 1 Manual Revisions
command descriptions: ALSEL, AOVER, CON,
DSEND, and MODS. Updated FILT command
description. Updated technical specification.
software version 5.10 onwar d.
Added Modbus protocol. Updated serial line
command descriptions. Updated storage
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
WARNING
CAUTION
NOTE
not read and follow
mportant data could be lost.
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Chapter 1 _________________________________________________________ General Information
Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
Do not modify the unit. Improper modification can damage the product,
lead to malfunction, or make the product noncompliant
legislation.
Recycle all applicable material.
Dispose of the unit according to statutory regulations.
with regular household refuse.
Safety
The DMT340 Dewpoint and Temperature Transmitter delivered to you
has been tested for safety and approved as shipped from the factory. Note
the following precautions:
WARNING
CAUTION
with applicable
ESD Protection
Recycling
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.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground yourself
to the equipment chassis before touching the boards. Ground yourself
with a wrist strap and a resistive connection cord. When neither of the
above is possible, touch a conductive part of the equipment chassis
with your other hand before touching the boards.
- Always hold the boards by the edges and avoid touching the
component contacts.
VAISALA ________________________________________________________________________ 13
Do not dispose of
User's Guide _______________________________________________________________________
Regulatory Compliances
EU Declaration of Conformity
Vaisala DRYCAP® Humidity and Temperature Transmitter Series
DMT340 is in conformity with the provisions of the following EU
directives:
- Low Voltage Directive
- EMC-Directive
Conformity is shown by compliance with the following standards:
- EN 60950-1
- EN 61326-1: Electrical equipment for measurement, control, and
laboratory use – EMC requirements – for use in industrial locations.
- EN 550022: Information technology equipment – Radio disturbance
characteristics – Limits and methods of measurement.
Transmitters with LAN or WLAN Interface
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful
interference in a residential installation. Operation is subject to the
following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that
may cause undesired operation of the device.
This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of
the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
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Chapter 1 _________________________________________________________ General Information
Transmitters with WLAN Interface
This device has been designed to operate with a 2 dBi half-wave antenna.
Antennas with a gain greater than 2 dBi are prohibited for use with this
device. The antenna impedance is 50 ohms.
To reduce potential radio interference to other users, the antenna type and
its gain should be so chosen that the equivalent isotropically radiated
power (EIRP) is not more than that permitted for successful
communication.
This Class [B] digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [B] est conforme à la norme NMB-
003 du Canada.
Patent Notic e
The Vaisala DRYCAP® Dewpoint and Temperature Transmitter Series
DMT340 is protected by, for example, the following patents and their
corresponding national rights:
Finnish patents 98861 and 99164, French patents 6650303 and 9504397,
German patents 69418174 and 19513274, Japanese patents 3585973 and
2801156, UK patents 0665303 and 2288465, and U.S. patent 5607564.
Trademarks
DRYCAP® is a registered trademark of Vaisala Oyj.
All other trademarks are the property of their respective owners.
Software License
This product contains software developed by Vaisala. Use of the software
is governed by license terms and conditions included in the applicable
supply contract or, in the absence of separate license terms and
conditions, by the General License Conditions of Vaisala Group.
VAISALA ________________________________________________________________________ 15
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Warranty
Visit our Internet pages for standard warranty terms and conditions:
www.vaisala.com/warranty.
Please observe that any such warranty may not be valid in case of
damage due to normal wear and tear, exceptional operating conditions,
negligent handling or installation, or unauthorized modifications. Please
see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.
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Chapter 2 ___________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIE W
This chapter introduces the features, advantages, and the product
nomenclature of the Vaisala DRYCAP® Dewpoint and Temperature
Transmitter DMT340 Series.
Introduction to DMT340
The DMT340 transmitter measures dewpoint temperature accurately in a
measurement range from -60ºC to +80 ºC (-76 ... +176 ºF). The AutoCal
feature provides excellent long term stability of the measurement.
DMT340 incorporates the advanced DRYCAP® technology, which
enables reliable and high-performance dewpoint measurement.
Apart from the extended dewpoint measurement range the optional
modules provide for more flexibility. See Table 2 on page 18 for the
quantities that DMT340 measures and calculates. See Table 3 on page 18
for the optional quantities measured by DMT340.
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User's Guide _______________________________________________________________________
Quantity
Abbreviation
Metric Unit
Non-Metric
Unit
Dewpoint/frost point
temperature (T
d/f
)
TDF
ºC
ºF
Mixing ratio (x)
X
g/kg
gr/lb
Parts per million
H2O
ppmv/ ppmw
ppmv/ ppmw
Quantity
Abbreviation
Metric Unit
Non-Metric
Unit
Relative humidity RH
RH
%RH
%RH
Temperature T
T
ºC
ºF
Dewpoint/frost point in the
atmospheric pressure (T
d/f
)
TDFA
ºC atm
ºF atm
Absolute humidity (a)
A
g/m3
gr/ft3
Absolute humidity in standard
pressure and temperature (NTP)
ANTP
g/m3
gr/ft3
Wet bulb temperature (Tw)
TW
ºC
ºF
Water vapor pressure (Pw )
PW
hPa
lb/in2
Water vapor saturation pressure
(Pws)
PWS
hPa
lb/in2
Enthalpy (h)
H
kJ/kg
Btu/lb
Difference of T and T
d/f
(∆T)
DT
ºC
ºF
Dewpoint temperature (Td )*
TD
ºC
ºF
Dewpoint in the atmospheric
pressure (Td )*
TDA
ºC atm
ºF atm
Table 2 Quantities and Their Abbreviations
Table 3 Optional Quantities and Their Abbreviations
* Use these parameters only if you need dewpoint over water below 0 ºC/32ºF and not
over ice (industry standard)
18 ___________________________________________________________________ M210704EN-G
Chapter 2 ___________________________________________________________ Product Overview
Basic Features an d Options
- Dewpoint measurement with AutoCal and sensor purge features
- Sensor warming in high humidities
- Two analog outputs and a serial interface
- Several probes for different applications
- User friendly display and keypad interface (optional)
- Calculated output quantities available
- Different probe mounting kits, sensor protection options and probe
cable lengths
- Support for Modbus serial communications protocol
- USB connectivity for service connections via the optional
USB-RJ45 cable
- Optional modules:
- Galvanic isolation for outputs
- Power supply module for AC mains power
- RS-422/485-module
- LAN and WLAN interfaces
- Data logger module with real time clock
- Additional analog output module
- Alarm relay module
VAISALA ________________________________________________________________________ 19
User's Guide _______________________________________________________________________
The numbers refer to Figure 1 above:
1 = Signal + powering cable gland
2 = Cable gland for optional module, or WLAN antenna connector
3 = Cable gland for optional module or AC mains cable
4 = Cover screw (4 pcs)
5 = Display with keypad (optional)
6 = Cover LED
Structure of the Transmitter
1104-001
Figure 1 Transmitter Body
20 ___________________________________________________________________ M210704EN-G
Chapter 2 ___________________________________________________________ Product Overview
The numbers refer to Figure 2 above:
1 = Service port (RS-232)
2 = Dip switches for analog output settings
3 = Power supply and signal wiring screw terminals
4 = Relay, data logger, RS-422/485, LAN, or WLAN module
(optional)
5 = Grounding connector
6 = Power supply module (optional)
7 = Relay, data logger, or analog output module (optional)
8 = Dewpoint probe
9 = Galvanic isolation module (optional)
10 = Adjustment button (Purge button) with indicator LED and
pressure set buttons.
0604-006
Figure 2 Inside the Transmitter
VAISALA ________________________________________________________________________ 21
User's Guide _______________________________________________________________________
DMT342
sampling cell
DMT344
DMT347
DMT348
Probe Options
small-size
flanged probe
for use with
for high
pressure
applications
probe with
Swagelok
connector
for pressurized
pipelines
Figure 3 Probe Options
For probe cable lengths, see Table 34 on page 167.
0503-019
22 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
CHAPTER 3
INSTALLATION
Mounting the Housing
The housing can be mounted either without the mounting plate or with
optional mounting plates.
Standard Mounting witho ut Mount ing Plate
Mount the housing without the mounting plate by fastening the
transmitter to the wall with 4 screws, for example, M6 (not provided).
0804-066
Figure 4 Standard Mounting
VAISALA ________________________________________________________________________ 23
User's Guide _______________________________________________________________________
The numbers refer to Figure 5 above:
1 = Plastic mounting plate
2 = Mount the plate to wall with 4 screws M6 (not provided)
3 = Arched side up
4 = Fasten DMT340 to the mounting plate with 4 fixing screws M3
(provided)
5 = Holes for wall/junction box mounting
183 (7.20)
133 (5.24)
116 (4.57)
104 (4.09)
84 (3.30)
59 (2.32)
59 (2.32)
Ø6.2 (0.24)
4.5 (0.18)
10.5 (0.41)
6.5 (0.26)
8.5 (0.33)
Thickness
9.5 (0.37)
Wall Mounting with Wall Mounting Kit
When mounting with wall mounting kit the mounting plate (Vaisala
order code 214829) can be installed directly on wall or onto a standard
wall box (also US junction box). When wiring through back wall, remove
the plastic plug from the wiring hole in the transmitter before mounting.
0503-004
Figure 5 Mounting with Wall Mounting Kit
Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch)
Metal mounting plate is included in rain shield with installation kit and
installation kit for pole or pipeline.
24 ___________________________________________________________________ M210704EN-G
0804-065
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 7 above:
1 = Mount the plate to wall with 4 screws M8 (not provided)
2 = Fasten DMT340 to the mounting plate with 4 fixing screws
M6 (provided)
3 = Note the position of the arrow when mounting. This side must
be up when mounting.
0503-041
Figure 7 Mounting with Metal Wall Mounting Plate
Figure 8 Dimensions of Metal Mounting Plate (mm/inch)
0509-151
VAISALA ________________________________________________________________________ 25
User's Guide _______________________________________________________________________
Mounting with DIN Rail Installation Kit
DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners and
2 screws M4 x 10 DIN 7985 (Vaisala order code 215094).
1. Attach two spring holders to the plastic mounting plate by using the
screws provided in the installation kit.
2. Fasten DMT340 to the plastic mounting plate with 4 screws
(provided).
3. Press the transmitter onto the DIN rail so that the clip-fasteners
snap into the rail.
0503-002
Figure 9 Mounting with DIN Rail Installation Kit
26 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 10 above:
1 = Fixing brackets (2 pcs) M8 (provided) for 30 ... 102 mm
poles.
2 = Mounting nuts M8 (4 pcs)
Number refers to Figure 11 above:
1 = Mounting nuts M8 (4 pcs)
Pole Installation with Installation Kit for Pole or Pipeline
Installation kit for pole or pipeline (Vaisala order code: 215108) includes
the metal mounting plate and 4 mounting nuts for pole mounting. When
mounting, the arrow in the metal mounting plate must point upward, see
Figure 7 on page 25.
0503-006
Figure 10 Vertical Pole
0503-007
Figure 11 Horizontal Pole
VAISALA ________________________________________________________________________ 27
User's Guide _______________________________________________________________________
The numbers refer to Figure 12 above:
1 = Fasten the rain shield with the installation kit (Vaisala order
code: 215109) to the metal mounting plate with 2 (M6)
mounting screws (provided)
2 = Fasten the mounting plate with rain shield with installation kit
to the wall or to the pole (see pole installation)
3 = Fasten the DMT340 to the mounting plate with 4 fixing screws
(provided)
Mounting the Rain Shield with Installation Kit
The rain shield is highly recommended for outdoor installations,
especially for transmitters with the display/keypad option.
0503-008
Figure 12 Mounting the Rain Shield with Installation Kit
Panel Mounting Frame
To enable a neat and dirt free embedded installation of the transmitter, a
panel mounting frame is available as an option (Vaisala order code:
216038). The frame is a thin, flexible plastic frame for the transmitter,
with adhesive tape on one side.
The frame is used to hide any rough edges of the installation hole, and
provide a more finished look. Note that the panel mounting frame is not
intended to bear the weight of the transmitter, and does not include any
mounting supports.
Use the panel mounting frame as follows:
1. Use the frame as a template to mark the required size for the
installation hole in the panel.
2. Cut the hole in the panel.
3. Mount the transmitter through the panel with suitable supports.
28 ___________________________________________________________________ M210704EN-G
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