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.
_________________________________________________________________________________
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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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
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 13 above:
1 = Panel (not included)
2 = Panel mounting frame
4. Remove the paper protecting the adhesive tape on the frame, and
attach the frame around the transmitter. Refer to Figure 13 below.
Figure 13 Panel Mounting Frame
0704-002
VAISALA ________________________________________________________________________ 29
0804-083
Figure 14 Panel Mounting Dimensions (mm/inch)
User's Guide _______________________________________________________________________
The numbers refer to Figure 15 above:
1 = Cable for signal/powering Ø8 ... 11 mm
2 = Cable for optional module Ø8 ... 11 mm
3 = Cable for optional power module Ø8 ... 11 mm
When there is high electric noise level (for example near powerful
electric motor) in the operating environment it is recommended to use
shielded cable or take care that the signal cables are separated from other
cables.
Wiring
Cable Bushings
A single electrical cable with a screen and three to ten wires is
recommended for power and analog/serial connections. The cable
diameter should be 8 ... 11 mm. The number of cable bushings depends
on the transmitter options. See the following recommendations for the
cable bushings:
NOTE
0503-010
Figure 15 Cable Bushings
30 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
Grounding the Cables
Ground the screen of the electrical cable properly to achieve the best
possible EMC performance.
0605-027
Figure 16 Grounding the Screen of Electrical Cable
Refer to Figure 16 above when performing the procedure below.
1. Cut back outer sheath to desired length.
2. Cut back screen braiding or screen foil to dimension X.
3. Push the domed cap nut (item 1) and the seal insert with contact
socket of the gland (item 2+3) onto the cable as shown in the
diagram
4. Bend over the screen braiding or screen foil by about 90º
(item 4).
5. Push the seal insert with the contact socket of the gland
(item 2+3) up to the screen braiding or screen foil.
6. Mount the lower part (item 5) on the housing
7. Push the seal with the contact socket of the gland (item 2+3)
into the lower part (item 5).
8. Fasten the domed cap nut (item 1) onto the lower part (item 5).
VAISALA ________________________________________________________________________ 31
User's Guide _______________________________________________________________________
The numbers refer to Figure 17 above:
1 = Power supply terminals 10 ... 35 VDC, 24 VAC
2 = User port (RS-232 terminals)
3 = Analog signal terminals
Make sure that you connect only de
Transmitter Housing Grounding
In case you need to ground the transmitter housing, the grounding
connector is found inside the housing; see Figure 1 on page 20. Note
anyhow that the probe is connected to the same potential as the housing.
Make sure that different groundings are made to the same potential.
Otherwise harmful ground currents may be generated.
If it is needed to have galvanic isolation of the power supply line from
the output signals, DMT340 can be ordered with optional galvanic
isolation module.This module prevents harmful grounding loops.
Signal and Power Supply Wiring
When connecting transmitter with 8-pin connector, see section 8-Pin
Connector on page 68.
0605-028
Figure 17 Screw Terminal Block on the Motherboard
WARNING
32 ___________________________________________________________________ M210704EN-G
-energized wires.
Chapter 3 ________________________________________________________________ Installation
1. Open the transmitter cover by taking out the four cover screws.
2. Insert the power supply wires and signal wires through the cable
bushing in the bottom of the transmitter; see the grounding
instructions in the previous sections.
3. Connect the analog output cables to terminals: Ch1 +, Ch1-, Ch2+,
Ch2-. Connect the RS-232 user port cables to terminals RxD, GND
and TxD. See section User Port Connection on page 83.
4. When wiring the optional modules, see the corresponding section
for instructions:
- RS-422/485 Interface on page 60
- Alarm Relays on page 58
- Third Analog Output on page 56
- LAN Interface on page 64
- WLAN Interface on page 65
5. Connect the power supply wires to the connectors: POWER
10...35V+ 24V∼ (+) and (-) terminals. (If using AC voltage,
connect always phase to power supply (+) and 0 to power supply
(-)). When wiring the power supply module, see section Power
Supply Module on page 51.
6. Turn on the power. The indicator LED on the cover is lit
continuously during normal operation.
7. Close the cover and replace the cover screws. The transmitter is
ready for use.
VAISALA ________________________________________________________________________ 33
User's Guide _______________________________________________________________________
24
To pr
connected to a "
must connect the same wire on the "
Connections to a 24 VAC Power Supply
Separate floating supply for each transmitter is recommended (see the
upper part of Figure 18 on page 34). If you have to connect several
transmitters or other instruments to one AC supply, the phase (~) must
always be connected to the (+) connector of each transmitter (see the
lower part of Figure 18).
CAUTION
VAC POWER SUPPLY USE
event fire and/or damage, if either 24 VAC wire is grounded or
-", "0", or "GND" terminal of any other device, you
-" terminal also on this instrument.
Figure 18 Connections to 24 VAC Power Supply
34 ___________________________________________________________________ M210704EN-G
0703-041
Chapter 3 ________________________________________________________________ Installation
Some probe and filter combinations are equipped with a washer under the
filter. When mounting a probe inside a sampling cell, you may have to
remove th
When
temperature at the measurement point is equal to that of the process,
otherwise the moisture reading may be incorrect.
Probe Mounting
NOTE
e washer to make the probe fit.
NOTE
measuring temperature dependent quantities make sure that the
DMT342 Small-size Flanged Probe for Use with Sampling Cell
The DMT342 probe is a small pressure-tight probe equipped with
installation flange. When sampling in pressurized processes, the
sampling cell HMP302SC is available as an optional accessory. It may be
necessary to use the sampling cell if the process (for example a pipe) is
too small for the DMT342 probe. Furthermore, if the process is very hot
(>80 °C) or particularly dirty, the probe is installed in a sampling cell
behind a cooling coil and/or filter. In this case, the ambient temperature
must be at least 10 °C warmer than the process dewpoint in order to
avoid condensation in the sample tubing.
Figure 19 DMT342 Installation (without the Sampling Cell)
VAISALA ________________________________________________________________________ 35
0503-018
User's Guide _______________________________________________________________________
The numbers refer to Figure 20 above:
1 = Gas in
2 = Probe
3 = Gas out
4 = Probe
5 = Sampling cell
6 = Clamp (not needed if sampling cell is supported on the piping)
In pressurized processes it is essential to tighten the supporting nuts and
screws very carefully to
pressure.
When the DMT340 is installed in a process with a pressure differing from
the selected operating pressure at the time of ordering, please enter the
pressure value of the process into the transmitter memory, see section
Pressure Compensation Setting
commands XPRES and PRES or the d
buttons on the motherboard inside the transmitter can also be used to set
pressure compensation.
CAUTION
NOTE
0503-017
Figure 20 HMP302SC Optional Sampling Cell
prevent loosening of the probe by the action of
on page 106. Use the serial line
isplay/keypad. The pressure set
36 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 21 above:
1 = Tightening cone
2 = Nut
3 = Fitting screw, M22x1.5 or NPT 1/2"
4 = Sealing washer
5 = Probe; Ø12 mm
DMT344 For High-pressure Applications
The DMT344 probe is for the dewpoint measurements in pressurized
rooms and industrial processes. The probe is provided with a nut, a fitting
screw and a sealing washer. Keep the fitting screw and the nut in place
on the body of the probe during handling to prevent damage to the highly
polished surface of the probe. Follow the instructions below to achieve a
leak-tight assembly:
1. Remove the fitting screw from the nut and the probe.
2. Fasten the fitting screw to the chamber wall with a sealing washer.
Tighten the fitting screw into the threaded sleeve with a torque
spanner. The tightening torque is 150 ± 10 Nm (110 ± 7 ft-lbs).
3. Insert the body of the probe into the fitting screw and install the nut
manually to the fitting screw so that the connection feels tight.
4. Mark both the fitting screw and the nut hex.
0506-029
Figure 21 DMT344 Probe
5. Tighten the nut a further 30º (1/12) turn or if you have a torque
spanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).
0503-034
VAISALA ________________________________________________________________________ 37
Figure 22 Tightening the Nut
User's Guide _______________________________________________________________________
When re
without increased effort.
The numbers refer to Figure 23 above:
1 = Fitting screw
2 = Sealing washer
3 = Tightening cone
4 = Clean cotton stick
In pressurized processes it is essential to tighten the supporting nuts and
screws very carefully to prevent
pressure.
When the DMT340 is installed in a process with a pressure differing
from the selected operating pressure at the time of ordering, please enter
the pressure value of the process into the transmitter m
enter the value
-
-
-
See section
using
NOTE
-tightening the nut after detachment the nut must be tightened
6. Clean and grease the tightening cone of the fitting screw after every
tenth detachment. Change the sealing washer every time the fitting
screw is detached. Use high-vacuum gr ease (fo r e x am pl e Dow
Corning) or a similar grease.
0503-033
Figure 23 Cleaning of the Tightening Cone
CAUTION
loosening of the probe by the action of
NOTE
in the following ways:
using the display/keypad option
using the buttons on the motherboard
using the serial line
using the Modbus protocol
Pressure Compensation Setting on page 106. If you are
Modbus, see section Configuration Registers on page 185.
emory. You can
38 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 25 above:
1 = Probe
2 = Duct connector
3 = ISO1/2", ISO3/8" or NPT1/2" thread
4 = Swagelok connector
5 = Ferrules
DMT347 Small Pressure-tight Probe
The DMT347 is ideal for tight spaces with threaded connection. The
small probe is installed using the threaded fitting bodies, see below.
Pressure-Tight Swagelok Installation Kits for DMT347
Swagelok installation kit for the dewpoint probe includes Swagelok
connector with ISO1/2" thread (Vaisala order code: SWG12ISO12),
ISO3/8" thread (Vaisala order code: SWG12ISO38) or NPT1/2" thread
(Vaisala order code: SWG12NPT12).
0503-042
Figure 24 DMT347 Probe with Swagelok Installation Kit
0503-021
Figure 25 DMT347 Probe Installation to Pipeline with Swagelok
Installation Kit
VAISALA ________________________________________________________________________ 39
User's Guide _______________________________________________________________________
1. Preparing Installation. The connector options are the following:
a. R3/8" ISO (Swagelok code SS-12M0-1-6RTBT)
b. 1/2" NPT (Swagelok code SS-12M0-1-8BT)
c. 1/2" ISO (Swagelok code SS-12M0-1-8RPBT)
Note that the connector inner diameters extend for Ø12 mm probe.
2. Probe position. Before the final tightening check that the upper
edge of the connector nut is in line with the upper edge of the
probe. Otherwise the sealing may not be gas tight.
3. Gas tight sealing
a. Turn the connector nut finger tight and draw a vertical mark
on the nut and the fitting body.
b. Be sure that the probe position follows step 2.
c. Tighten the connector nut with a wrench 1 and 1/4 turns
(360º +90º) with the help of marks you drew. The connector
has now a gas tight connection to the probe. Excess
tightening can damage the probe.
NOTE
d. Connector can be disconnected and re-installed. In re-
installation first turn the connector nut finger tight and then
with wrench 1/4 turn (90º).
Use teflon tape or thread sealant to seal the connection between the
Swagelok connector and the process, see Figure 28 on page 42.
If the Swagelok connector is tightened at an incorrect position, it is
possible that the probe will not fit the calibration station. Be sure that the
probe position follows step 2 above.
40 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 26 above:
1 = Clasp nut, 27 mm hex nut
2 = Fitting body, 24 mm hex head
3 = Leak screw
1 = Non-leaking screw (A)
(factory
(included in the package)
DMT348 For Pressurized Pipelines
Due to the sliding fit the DMT348 is easy to install into and remove from
the pressurized process. The probe is especially suitable for the
measurements in pipelines. See section Ball Valve Installation Kit for
DMT348 on page 44.
0503-020
Figure 26 DMT348 Probe
The following three fitting body options are available:
- Fitting Body Set ISO1/2 with leak screw
- Fitting Body ISO1/2 solid structure (without leak screw)
- Fitting Body NPT1/2 solid structure (without leak screw)
setting) or leak screw (B)
VAISALA ________________________________________________________________________ 41
0503-005
Figure 27 Leak Screw in the DMT348 Probe
User's Guide _______________________________________________________________________
Probe type
Probe Dimension
Adjustment Range
Standard
178 mm
120 mm
Optional
400 mm
340 mm
Table 4 DMT348 Probe Dimensions
0506-031
Figure 28 Sealing of Fitting Body into Process
Tightening the Clasp Nut
1. Adjust the probe to a suitable depth according to the type of
installation.
2. Tighten the clasp nut first manually.
3. Mark the fitting screw and the clasp nut.
4. Tighten the nut a further 50 … 60º (ca. 1/6 turn) with a wrench. If
you have suitable torque spanner, tighten the nut to max 45 ± 5 Nm
(33 ± 4 ft-lbs).
42 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 29 above:
1 = Probe
2 = Clasp nut
3 = Fitting screw
4 = Pen
Take care not to damage the probe body. A damaged body
probe less tight and may prevent it from going through the clasp nut.
In pressurized processes it is essential to tighten the supporting nuts and
screws very carefully to prevent loosening of the probe by the action of
pressure.
Take care not to over tighten the clasp nut to avoid difficulties when
opening it.
When the DMT340 is installed in a process with a pressure differing
from the selected operating pressure at the time of ordering, please enter
the pressure value of the process into the transmitter memory, see
section
commands XPRES and PRES or the d
buttons on the motherboard inside the transmitter can also be used to set
pressure compensation.
0505-276
Figure 29 Tightening the Clasp Nut
CAUTION
CAUTION
NOTE
NOTE
makes the
Pressure Compensation Setting on page 106. Use the serial line
isplay/keypad. The pressure set
VAISALA ________________________________________________________________________ 43
User's Guide _______________________________________________________________________
The numbers refer to Figure 30 above:
1 = Manual press tool
2 = Handle of the ball valve
3 = Probe
4 = Process chamber or pipeline
5 = Groove on the probe indicates the upper adjustment limit
6 = Filter
7 = Ball of the ball valve
8 = Fitting screw
Ball Valve Instal lation Kit for DMT348
The ball valve installation kit (Vaisala order code: BALLVALVE-1) is
preferred when connecting the probe to a pressurized process or pipeline.
Use the ball valve set or a 1/2" ball valve assembly with a ball hole of
ø14 mm or more. If you install the probe (ø12 mm) in a process pipe,
please note that the nominal size of the pipe must be at least 1 inch (2.54
cm). Use the manual press handle to press the probe into the pressurized
(< 10 bar) process or pipeline.
0507-043
Figure 30 Installing the DMT348 Probe Through a Ball Valve
Assembly
44 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The probe can be installed in the process through
provided that the process pressure is less than 10 bars. This way, the
process does not have to be shut down when installing or removing the
probe. However, if the process is shut down before removing the probe,
the process pressure
When measuring temperature dependent quantities make sure that the
temperature at the measurement point is equal to that of the process,
otherwise the moisture reading may be incorrect.
Take care not to tighten the clasp
when opening it.
NOTE
NOTE
the ball valve assembly
can be max. 20 bars.
Follow the steps below to install the DMT348 probe through a ball valve
assembly. After the installation, the probe should be sitting in the process
chamber or pipeline as shown in Figure 30 on page 44.
1. Shut down the process if the process pressure is more than 10 bars.
If the pressure is lower there is no need to shut down the process.
2. Close the ball valve.
3. Seal the threads on the fitting body; refer to Figure 28 on page 42.
NOTE
4. Attach the fitting body to the ball valve and tighten it.
5. Slide the clasp nut of the probe toward the filter, as far as it will go.
6. Insert the probe to the fitting body, and manually tighten the clasp
nut to the fitting body.
7. Open the ball valve.
8. Push the probe through the ball valve assembly into the process. If
the pressure is high, use the pressing handle that is provided with
the probe. If you push the probe hard without using the handle, you
may damage the cable.
Note that the probe must be pushed so deep that the filter is
completely inside the process flow.
9. Mark the fitting screw and the clasp nut.
10. Tighten the clasp nut with a fork spanner a further 50 ... 60º
(ca. 1/6 turn). If you have a suitable torque spanner, tighten the nut
to max 45 ± 5 Nm (33 ± 4 ft-lbs). Refer to Figure 29 on page 43.
nut more than 60° to avoid difficulties
If you wish to remove the probe from the process, note that you have to
pull the probe out far enough. You cannot close the valve if the groove
on the probe body is not visible.
VAISALA ________________________________________________________________________ 45
User's Guide _______________________________________________________________________
The numbers refer to Figure 31 above:
1 = Probe
2 = Filter
3 = Ball of the ball valve
4 = Leak screw
Leak Screw Installation
When the probe cannot be installed directly in the pressurized process or
process pipe, a leak screw installation can be used.
In this installation method, you must install the DMT348 probe using a
fitting body with leak screw, see Figure 27 on page 41. A small sample
flow from the process goes through the probe and via the leak screw out
to atmospheric pressure enabling a fast response time although the probe
is not installed in the process.
0503-036
Figure 31 Probe in Leak Screw Installation
46 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 32 above:
1 = measured gas
2 = probe
3 = DM240FA flange (thread G1/2" ISO)
4 = use R1/2" ISO fitting body for DMT348 probe with DM240FA
flange
5 = recommended additional hole (plugged) for Td field check
reference measurement probe (for example, Vaisala DM70)
Mounting the Probe Directly to the Process
Select a point, which gives a true picture of the process. The transmitter
can be installed directly in the process wall, especially if the pressure of
the process is 1 bar (atmospheric processes).
It may be necessary to use the sampling cell if the process (for example a
pipe) is too small for the DMT348 probe. Furthermore, if the process is
very hot (>80 °C) or particularly dirty, the probe is installed in a
sampling cell behind a cooling coil and/or filter. In this case, the ambient
temperature must be at least 10 °C warmer than the process dewpoint in
order to avoid condensation in the sample tubing.
0503-016
Figure 32 DM240FA with Probe
If the probe is installed in process pipes where the water is likely to
collect at the measurement point, take care to install the probe so that it
will not be immersed in water.
VAISALA ________________________________________________________________________ 47
User's Guide _______________________________________________________________________
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 probe can be removed from the process for calibration or
maintenance.
If the probe is installed in a pressurized chamber, always make sure that
the pressure of the chamber is equalized with the ambient pressure prior
to removing the probe. When the probe is pulled out for maintenance,
cap the hole with a capped nut. This way, the process can be running
although the probe is not in place. For ISO threaded connections, a plug
(Vaisala order code 218773) is available.
0706-001
Figure 33 Example of Installing the Probe Directly on the Process
Pipe
48 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 34 above:
1 = Male pipe weld connector Swagelok 1/4"
2 = G1/2"
3 = G1/4"
4 = G3/8"
Sampling Cell for DMT348
It may be necessary to use a sampling cell if the process (for example a
pipe) is too small for the DMT348 probe. Furthermore, if the process is
very hot (>80 °C) or particularly dirty, the probe is installed in a
sampling cell behind a cooling coil and/or filter. In this case, the ambient
temperature must be at least 10 °C warmer than the process dewpoint in
order to avoid condensation in the sample tubing.
Sampling Cell with Swagelok Connectors (Vaisala order code:
DMT242SC2) and Sampling Cell with Female Connectors (Vaisala order
code: DMT242SC) are available as an option.
0506-026
Figure 34 Sampling Cells DMT242SC2 and DMT242SC
VAISALA ________________________________________________________________________ 49
User's Guide _______________________________________________________________________
An overpressure in the process is necessary to create a flow through the
sampling cell. Note that the pressure of the sampling cell must not differ
from that of the process because dewpoint temperature changes with
pressure. In dirty processes, it may be necessary to use a filter between
the cooling coil and the sampling cell. One more simple way of using the
sampling cell with user provided accessories is shown in the figure
below.The flow through the sampling cell is controlled with the needle
valve and the pressure is kept equal to that of the process.
0503-022
Figure 35 Installing the Probe in High Temperatures
50 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 36 above:
1 = Connect AC mains voltage wires to these terminals
2 = Grounding terminal
3 = In case the module is not installed in the factory: Connect wires
from these terminals to the
of the motherboard.
4 = + 5 =
-
Optional Modules
Power Supply Module
The mains power connection may be connected to the power supply
module only by an authorized electrician. A readily accessible disconnect
device shall be incorporated in the fixed wiring.
0506-027
Figure 36 Power Supply Module
POWER 10 ... 35V 24V terminals
VAISALA ________________________________________________________________________ 51
User's Guide _______________________________________________________________________
Do not detach the power supply module from t
power is on.
Do not connect the mains power to power supply module when it is not
installed in the transmitter.
Always connect protective ground terminal.
Installation
1. Disconnect the power.
2. Remove the protective plug from the cable gland and thread the
wires. In case the power supply module is installed in the factory,
continue with the step 5.
3. To attach the module, open the transmitter cover and fasten the
power module to the bottom of the housing with four screws. See
the position on page 19.
4. Connect the wires from the terminals of the power supply module
marked with + and - to the terminals POWER 10 ... 35 V 24V on
the motherboard of the transmitter.
5. Connect the AC mains voltage wires to the power supply module
terminals marked with N and L.
6. Attach the grounding wire to the grounding terminal on the righthand side of the transmitter.
7. Connect the power. The LED on the cover of the transmitter is lit
continuously during normal operation.
WARNING
WARNING
WARNING
he transmitter when the
52 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
Warnings
Dieses Produkt entspricht der Niederspannungsrichtli nie (2006/95/EWG).
- Das Netzmodul darf nur von einem dazu befugten Elektriker angeschlossen werden.
- Trennen Sie das Netzmodul nicht vom Messwertgeber , wenn der Strom eingeschaltet ist.
- Verbinden Sie das Netzmodul nur mit der Spannungsquelle, wenn es im Messwertgeber
DMT340 montiert ist.
- Das Erdungskabel muss zum Schutz immer angeschlo s s en sein.
Ce produit est conforme à la Directive relative à la Basse Tension (2006/95/EEC).
- Seul un électricien compétent est habilité à raccorder le module d’alimentation au secteur.
- Ne pas détacher le module d’alimentation du transmetteur lorsqu’il est en ser vi ce.
- Ne pas raccorder le secteur au module d’alimentatio n lorsque celui-ci n’est p as installé dans le
transmetteur DMT340.
- Toujours raccorder un bornier de protection à la terre.
Tämä tuote on pienjännitedirektiivin (2006/95/EEC) mukain e n .
- Vaihtovirtaliitännän saa kytkeä tehonsyöttömoduuliin ainoastaan valtuutettu sähköasentaja
- Älä irrota tehonsyöttömoduulia lähettimestä, kun virta on kytkettynä.
- Älä kytke verkkovirtaa tehonsyöttömoduuliin, jos kyseistä moduulia ei ole asennettu
DMT340 lähettimeen.
- Kytke aina maadoitusliittimet.
Denna produkt uppfyller kraven i direktivet om lågspänning (2006/95/EEC).
- Nätanslutningen (växelströmsanslutningen) får bara anslutas till strömförsörjningsmodulen av
en behörig elektriker.
- Ta inte loss strömförsörjningsmodulen från mätaren när strömmen är på.
- Anslut inte strömförsörjningsmodulen till nätet när den inte är installerad i DMT340-mätaren
- Anslut alltid en skyddande jordningsplint.
Questo prodotto è conforme alla Direttiva sul basso voltaggio (2006/95/CEE).
- La conduttura elettrica può essere collegata al modulo di alimentazione elettrica soltanto da
un elettricista au to r izzato.
- Non staccare l’al imentazione elettrica dal trasmettitore quando è acceso.
- Non collegare la corrente elettrica al modulo di alimentazione elettrica se non è installato nel
trasmettitore DMT340.
- Collegare sempre il morsetto protettivo a terra!
VAISALA ________________________________________________________________________ 53
User's Guide _______________________________________________________________________
Dette produkt er i overensstemmelse med direktivet om lavspænding
(2006/95/EØS).
- Netstrømskoblingen til må kun tilsluttes strømforsyningsmodulet af en autoriseret elinstallatør
- Strømforsyningsmodulet må ikke løsgøres fra senderen, mens spændingen er sluttet til.
- Slut ikke netspændingen til strømforsyningsmodulet, når det ikke er installeret i DMT340-
senderen
- Forbind altid den beskyttende jordklemme!
Dit product voldoet aan de eisen van de richtlijn 2006/95/EEG
(Laagspanningsrichtlijn).
- De stroom kan aan de stroomtoevoer module aangesloten worden alleen door een bevoegde
monteur.
- Het is niet toegestaan de stroomtoevoer modu le van de transmitter los te kopp elen wanneer de
stroom aan is.
- Het is niet toegestaan de stroom aan de stroomtoevoer module aan te sluiten als deze niet in
een DMT340-transmitter is gemonteerd.
- Altijd beschermend aard contact aansluiten!
Este producto cumple con la directiva de bajo voltaje (2006/95/EEC).
- La conexión de la alimentación principal al módulo de alimentación sólo puede realizarla un
electricista autorizado.
- No desenchufe el módulo de alimentación del transmisor cuando esté encendido.
- No conecte la alimentación principal al módulo de alimentación cuando no esté instalado en
el transmisor DMT340.
- Conecte siempre el terminal de protección de conexión a tierra.
See toode vastab madalpinge direktiivile (2006/95/EEC).
- Voolukaabli võib vooluallika mooduli külge ühendada ainult volitatud elektrik.
- Ärge ühendage vooluallika moodulit saatja küljest lahti, kui vool on sisse lülitatud.
- Ärge ühendage voolukaablit vooluallika mooduli külge, kui seda pole DMT340-tüüpi
saatjasse paigaldatud.
- Ühendage alati kaitsev maand us klemm!
Ez a termék megfelel a Kisfeszültségű villamos termékek irányelvnek
(2006/95/EGK).
- A hálózati feszültséget csak feljogosított elektrotechnikus csatlakoztathatja a
tápegységmodulra.
- A bekapcsolt távadór ól ne csatolja le a tápegységmodult.
- Ne csatlakoztassa a háló zati feszültséget a tápegységmodulhoz, ha az nincs beépítve a
DMT340 távadóba.
- Feltétlenül csatlakoztasson földelő védőkapcsot!
54 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
Šis produktas atitinka direktyvą dėl žemos įtampos prietaisų (2006/95/EB).
- Elektros tinklą su energijos tiekimo moduliu sujungti gali tik įgaliotas elektrikas.
- Niekada neišimkite energijos tiekimo modulio iš siųstuvo, kai maitinimas yra įjungtas.
- Jei energijos tiekimo modulis nėra įmontuotas DMT340 siųstuve, nejunkite jo į elektros
tinklą.
- Visada prijunkite prie apsauginės įžeminimo jungties!
Šis produkts atbilst Zemsprieguma direktīvai (2006/95/EEC).
- Strāvas pieslēgumu var pieslēgt pie barošanas avota moduļa tikai autorizēts elektriķis.
- Neatvienot barošanas avota moduli no raidītāja, kad pieslēgta strāva.
- Nepievienot strāvu barošanas avota modulim, ja tas nav uzstādēts DMT340 raidītājā
- Vienmēr pievienot aizsargājošu iezemētu terminālu !
Ten produkt spełnia wymogi Dyrektywy niskonapięciowej (2006/95/EEC).
- Napięcie zasilające powinno zostać podłączone do modułu zasilacza tylko przez
wykwalifiko w a nego elektryka .
- Nie wolno odłączać modułu zasilacza od nadajnika, kiedy zasilanie jest włączone.
- Nie wolno podłączać napięcia zasilającego do modułu zasilacza, kiedy nie jest on
zamontowany w nadajniku DMT340.
- Zawsze należy podłączać zabezpieczający zacisk uziemiający!
Tento výrobek vyhovuje Směrnici pro nízké napětí (2006/95/EEC).
- Připojení síťového napájení k napájecímu modulu smí provádět pouze oprávněný elektrikář.
- Neodpojujte napájecí modul od snímače při zapnutém napájení.
- Nepřipojujte síťové napájení k napájecímu modulu, pokud není instalován ve snímači
DMT340.
- Vždy zapojte ochrannou zemnící svorku!
VAISALA ________________________________________________________________________ 55
User's Guide _______________________________________________________________________
Galvanic
supply m
incompatible to be installed at the same time. If both modules are
installed, there is no room to close the transmitter cover completely.
Number refers to Figure 37 above:
1 = Galvanic isolation module
The numbers refer to Figure 38 above:
1 = Flat cable pins
2 = Screw terminals for signal line
3 = Dip switches to select the output mode and range
Galvanic Isolation of the Power Supply
If galvanic isolation of the power supply line from the output signals is
needed, DMT340 can be ordered with optional galvanic isolation
module. This module prevents harmful grounding loops.
Installation
NOTE
isolation module is not needed when using the AC power
odule. Note also that these two modules are physically
0506-030
Figure 37 Galvanic Isolation Module
Third Analog Output
Figure 38 Third Analog Output
56 ___________________________________________________________________ M210704EN-G
0503-030
Chapter 3 ________________________________________________________________ Installation
Only one of the switches 1
Only one of the switches 3
Installation and Wiring
1. Disconnect the power. In case the analog output module is installed
in the factory, continue with the step 4.
2. To attach the module, open the transmitter cover and fasten the
analog output module to the position for MODULE 2 with four
screws. Refer to Figure 2 on page 21.
3. Connect the flat cable between the analog output module and the
motherboard's connector for MODULE 2.
4. Take out the protective plug from the cable gland and thread the
wires.
5. Connect the wires to the screw terminals marked with Ch+ and
Ch- .
6. Select the current/voltage output by setting ON either of the
switches 1 or 2.
7. Select the range by setting ON one of the switches 3 ... 7.
NOTE
... 2 can be ON at a time.
... 7 can be ON at a time.
0508-029
Figure 39 Third Analog Output Selection
8. Connect the power.
9. Select the quantity and scale the channel via the serial line or
display/keypad, see section Analog Output Quantities on page 124.
For testing the analog output, see section Analog Output Tests on
page 126. For fault indication setting, see section Analog Output
Fault Indication Setting on page 127.
VAISALA ________________________________________________________________________ 57
User's Guide _______________________________________________________________________
For installations in the USA: If your transmitter has both the relay
module and a LAN or WLAN module, the maximum voltage you are
allowed to connect to the relay module
NO
Normally open
C
Common relay
NC
Normally closed
Relay NOT activated:
C and NC outputs are closed, NO is open
Relay IS activated:
C and NO outputs are closed, NC is open.
Alarm Relays
DMT340 can be equipped with one or two configurable relay modules.
Each module contains two configurable relays. See the contact ratings in
section Technical Specifications of Optional Modules on page 168.
Installation and Wiring
1. Disconnect the power. In case the relay-module is installed in the
factory, continue with the step 5.
2. To attach the module, open the transmitter cover and fasten the
relay module to the bottom of the housing with four screws. See the
position in Figure 2 on page 21.
3. When the mains power is in use attach the grounding wire to the
grounding terminal.
4. Connect the flat cable between the relay module and the
motherboard's pins MODULE 2 or MODULE 1.
5. Take out the protective plug from the cable gland and thread the
relay wires.
CAUTION
6. Connect the wires to the screw terminals: NO, C, and NC.
is 50 V.
Selecting the Activation State of the Relay
The middlemost C terminal and either one of the terminals NO/NC shall
be connected. The polarity can be freely selected.
Connect the power and close the cover. For instructions on how to
operate the relay (for examp le, selecting quantity for the relay output and
setting the relay setpoints), see section Operation of Relays on page 128.
58 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
The numbers refer to Figure 40 above:
1 = Indication led for the relay 1 or 3
2 = Relay test buttons
3 = Flat cable pins
4 = Indication led for relay 2 or 4
The relay module may contain dangerous voltages even if the
transmitter power has been disconnected. Before working on the relay
module you must switch off
connected to the relay terminals.
Do not connect the
transmitter.
0503-037
Figure 40 Relay Module
WARNING
WARNING
both the transmitter and the voltage
mains power to relay unit without grounding the
VAISALA ________________________________________________________________________ 59
User's Guide _______________________________________________________________________
RS
connected when RS
normally.
The numbers refer to Figure 41 above:
1 = Flat cable pins
2 = Selection switches
3 = Screw terminals for wiring
The data lines on earlier versions of the RS
A and B instead of D1+ and D0
voltage compared to D0
When connecting the module, be prepared to swap the
wires if you have a communication problem.
1
2
3
RS-422/485 Interf ace
The RS-422/485 interface enables communication between an RS-485
network and the DMT340 transmitter. The RS-485 interface is isolated
and offers a maximum communications rate of 115 200 bits/s. (For
maximum bus length of 1 km, use bit rate 19200 b/s or less.)
When selecting an RS-232 to RS-485 converter for the network, avoid
self-powered converters, as they do not necessarily support the needed
power consumption.
NOTE
-232 User Port on DMT340 main board cannot be used and
-485 module is connected. Service port operates
1102-023
Figure 41 RS-422/485 Module
NOTE
60 ___________________________________________________________________ M210704EN-G
-422/485 module are marked
-. When the line is idle, D1+ has positive
-.
D1+ and D0-
Chapter 3 ________________________________________________________________ Installation
Screw Terminal
Data Line
(2-wire RS-485)
Data Line
(4-wire RS-485/422)
1
(not connected)
Rx D0-
2
(not connected)
Rx D1+
3
Common
Common
4
D0-
Tx D0-
5
D1+
Tx D1+
If you use the internal termination of the transmitter at the end of the
RS
transmitter will block the bus operation.
Installation and Wiring
1. Disconnect the power. In case the RS-422/485-module is installed
in the factory, continue with the item 4.
2. To attach the module, open the transmitter cover and fasten the
RS-422/485 module to the bottom of the housing with four screws.
3. Connect the flat cable between the RS-422/485 module and the
motherboard's pins MODULE1 (Communications).
4. Pull the network wirings through the cable gland.
5. Connect the twisted pair wires (1 or 2 pairs) to the screw terminals
as presented in Table 5:
Table 5 Connecting the Twisted Pair Wires to the Screw
Terminals
NOTE
To avoid problems in the RS-422/485 network, the Common
terminal should be wired to the corresponding terminals of the
other devices.
6. If you use RS-422 or RS-485 to connect just one DMT340 to a
master computer,enable the internal termination of DMT340 by
switching switches 1 and 2 ON. Make sure that the master's end of
the line is also terminated (by using master's internal termination or
with a separate terminator).
If you are connecting many transmitters to the same RS-485 bus,
make sure that switches 1 and 2 are OFF and terminate the bus with
separate terminators at both ends. This allows removing any
transmitter without blocking the bus operation.
-485 bus (instead of using separate terminators) removing that
7. Use the bus type (4-wire/2-wire) to select the selection switch 3.
In 4-wire mode RS-485 master sends data to the DMT340 through
terminals Rx D1+ and Rx D0- and receives data from DMT340
through terminals Tx D1+ and Tx D0-.
VAISALA ________________________________________________________________________ 61
User's Guide _______________________________________________________________________
RS-485 master
Data
DMT340
Tx D1+
→
Rx D1+
Tx D0-
→
Rx D0-
Rx D1+
←
Tx D1+
Rx D0-
←
Tx D0-
Stub
Termination Termination
Termination Termination
Twisted pair
120R
120R
120R
120R
Twisted pair
Stub
Stub
Baud > 19.2K Stub < 10ft, 3m
Baud >112K Stub < 1ft, 0.3m
Rx D0Rx D1+
Common
Tx D0Tx D1+
Switch
Term off
Term off
2/4 wire on
RS422 off
Tx D0Tx D1+
Common
Rx D0Rx D1+
Switch
Term off
Term off
2/4 wire on
RS422 off
Tx D0Tx D1+
Common
Rx D0Rx D1+
RS485-1
RS485-1
Address MM
Address NN
RS485 bus master
Junction
box
Junction
box
Junction
box
Common
line
Common
line
1102-028
Figure 42 4-Wire RS-485 Bus
Table 6 4-Wire (Switch 3: On)
62 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
RS-485 master
Data
DMT340
D1+
↔
D1+
D0- ↔ D0-
Termination
Termination
Junction
box
Junction
box
Junction
box
120R
D0D1+
Common
Switch
Term off
Term off
2/4 wire off
RS422 off
Stub
Stub
Stub
RS485-1
RS485-1
RS485 bus master
Twisted pair Common line
Address NN
Address MM
Common
D0D1+
Switch
Term off
Term off
2/4 wire off
RS422 off
Common
D0D1+
120R
Twisted pair Common line
Figure 43 2-Wire RS-485 Bus
Table 7 2-Wire (Switch 3: Off)
8. When operating in communication mode RS-422, set both switches
3 and 4 to ON position (4-wire wiring is required for RS-422
mode).
9. Connect the power and close the cover.
1102-027
VAISALA ________________________________________________________________________ 63
User's Guide _______________________________________________________________________
1 =
Flat cable connector
2 =
RJ45 connector with
indicator LEDs for
link and activity
LAN Interface
The optional LAN interface enables an Ethernet connection to the
transmitter. The user can establish a virtual terminal session using a
Telnet client program such as PuTTY or by using Modbus TCP protocol.
When the LAN interface is in use, serial communication using the RS232 User Port is disabled.
The LAN interface module must be installed at the factory (when
ordering the transmitter), or by a Vaisala Service Center. Once installed,
the module is automatically used by the transmitter. The physical
connection to the network is made to the RJ45 connector on the LAN
interface module, using a standard twisted pair Ethernet cable
(10/100Base-T). Transmitters with the optional LAN interface are
delivered pre-installed with a suitable cable and cable gland.
The LAN interface can use both static and dynamic network settings. If
the interface is configured to use dynamic settings, the network where the
LAN interface is connected must have a DHCP server that provides the
settings.
CAUTION
The network configuration can be done using the optional display and
keypad, or by using the service port. For instructions, see section LAN
Communication on page 85. The LAN interface also provides a web
configuration interf ace , whi ch you can acc ess b y entering the IP address
of the LAN interface in the address field of a web browser. See section
Web Configuration for LAN and WLAN on page 92.
The LAN interface is designed to be used in trusted network
environments (trusted corporate LAN or VPN-based connection over
internet). Avoid connecting the transmitter directly to a public network
because the device can be attacked by a malicious user through the
network.
64 ___________________________________________________________________ M210704EN-G
0709-003
Figure 44 LAN Interface Module
Chapter 3 ________________________________________________________________ Installation
1 =
Flat cable connector
2 =
Connector for antenna
cable (connected to
transmitter cover)
The WLAN interface is designed to be used in trusted
environments (trusted corporate LAN or VPN
internet). Avoid connecting the transmitter directly to a public network
because the device can be attacked by a malicious user through the
network.
WLAN Interface
The optional WLAN interface enables a wireless Ethernet connection
(IEEE 802.11b) to the transmitter. The user can establish a virtual
terminal session using a Telnet client program such as PuTTY or by
using Modbus TCP protocol. When the WLAN interface is in use, serial
communication using the RS-232 User Port is disabled.
The interface supports Wired Equivalent Privacy (WEP) and Wi-Fi
Protected Access (WPA, WPA2). For WEP, 64 and 128 bit encryption is
supported, with open system or shared key authentication. WPA is used
in the Pre-Shared Key (PSK) mode, with either TKIP or CCMP (also
known as AES) encryption.
Similarly to the LAN interface, the WLAN interface can use both static
and dynamic network settings. If the interface is configured to use
dynamic settings, the network where the WLAN interface is connected
must have a DHCP server that provides the settings.
CAUTION
The WLAN interface also provides a web configuration interface, which
you can access by entering the IP address of the WLAN interface in the
address field of a web browser. See section Web Configuration for LAN
and WLAN on page 92.
0802-103
Figure 45 WLAN Interface Module
network
-based connection over
VAISALA ________________________________________________________________________ 65
User's Guide _______________________________________________________________________
Observation Period
Period for Trend/Max/Min
Calculations (Resolution)
3 hours
90 seconds
1 day
12 minutes
10 days
2 hours
2 months
12 hours
1 year
3 days
4 years
12 days
NOTE
The default country setting for the WLAN interface is United States,
which limits the operation to WLAN channels 1 ... 11. To enable
additional channels (12 ... 14), you can change the country setting using
the web configuration interface.
Attaching the WLAN Antenna
The WLAN interface module must be installed at the factory (when
ordering the transmitter), or by a Vaisala Service Center. Before taking
the transmitter into use, you must attach the antenna of the WLAN
interface into the RP-SMA connector on the transmitter cover. The
location of the antenna is shown in Figure 92 on page 173.
Data Logger Module
The optional data logger module extends the data storage for the
measurement data. When the data logger is present, this storage is
automatically used by the transmitter. The stored data can be browsed
using the optional display module, and accessed through the serial
connections. See sections Graphic History on page 71 and Data
Recording on page 119.
The data logger module contains non-volatile flash memory providing
4 years and 5 months of storage for 4 parameters at a 10-second sampling
interval. When the memory is full, the data recording will not stop.
Instead, the oldest data is overwritten. For each parameter and
observation period, the module stores the minimum and maximum values
during the interval, as well a data trend value that is averaged from
samples taken during the interval (see Table 8 on page 66).
Table 8 Observation Periods and Resolution
The quantities that are logged are the same that have been selected for
measurement using the display/keypad or the serial line. When taking the
transmitter into use, verify that the desired quantities are selected. If you
change the quantities later, the transmitter will start logging the new
quantities, and stop logging the quantities that are no longer selected.
Changing the quantities does not delete any measurement data that is
already in memory. However, the data of any removed quantity cannot be
accessed unless the quantity is re-activated first.
66 ___________________________________________________________________ M210704EN-G
Chapter 3 ________________________________________________________________ Installation
1 =
Flat cable pins
2 =
Battery
The data logger module has a real time clock with a battery back-up. The
clock has been set to the Coordinated Universal Time (UTC) at the
factory, and its time cannot be set by the user. The data that is stored in
the logger's memory is timestamped using the logger's clock.
When date and time are set on the transmitter, they are stored to the
transmitter's memory as an offset from the time on the logger's clock.
When browsing the stored data, the time offset is applied to the
timestamps shown in the graphical history, and data outputted from the
serial port. The timestamps in the data logger's memory remain as they
were originally stored.
You can compensate for the clock drift (less than ±2 min/year) by setting
the time on the transmitter. This updates the time offset used on the
display and the serial port. You can set the time by using the
keypad/display or the serial commands.
0706-068
Figure 46 Data Logger Module
After a reset or a power up, it will usually take at least 10 seconds before
the data logger module is initialized. The instrument will not start up
before the data logger module is ready.
The indicator LED on the module will blink green during normal
operation. If the LED is lit in red color, there is a problem with the
module. The transmitter will also indicate the problem by activating the
"Internal error on add-on module" error. If the module is not operating
correctly, the transmitter must be sent to Vaisala for maintenance.
The data logger module must be installed at the factory (when ordering
the transmitter), or by a Vaisala Service Center. Once installed, the
module is automatically used by the transmitter. When the module
requires a new battery, the transmitter must be sent to Vaisala for
maintenance.
VAISALA ________________________________________________________________________ 67
User's Guide _______________________________________________________________________
Pin
Wire
Serial Signal
Analog Signal
RS-232 (EIA-232)
RS-485 (EIA-485)
1
White
Data out TX
D1+
-
2
Brown
(Serial GND)
(Serial GND)
Signal GND (for
both channels)
3
Green
-
-
Ch 2+
4
Yellow
-
-
Ch 1 +
5
Grey
Supply -
Supply -
Supply -
6
Pink
Supply +
Supply +
Supply +
7
Blue
Data in RX
D0-
- 8 Shield/Red
Cable shield
Cable shield
Cable shield
8-Pin Connector
1104-126
Figure 47 Pinout of the Optional 8-Pin Connector
Table 9 Wiring of the Optional 8-Pin Connector
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Chapter 4 _________________________________________________________________ Operation
CHAPTER 4
OPERATION
This chapter contains information that is needed to operate this product.
Getting Started
Within a few seconds after power-up the LED on the cover of the
transmitter is lit continuously indicating normal operation. When the
transmitter is turned on the first time, the language selection window
opens: Select the language with ▼▲ arrow buttons and press the
SELECT button (the left-hand button).
Pressure has an effect on humidity calculations and accuracy. Therefore,
accurate calculations can be achieved only when the ambient pressure is
taken into consideration. See page 106 for instructions on how to set the
pressure.
Start-up time for DMT340 transmitter is in total about 6 minutes. The
ouputs (serial and analog) are activated 3 seconds after powering up the
DMT340. If the data logger module is installed, the it may take up to 18
seconds for the outputs to be activated.
In addition, 10 seconds after the measurement the outputs will freeze for
about 6 minutes due to the sensor self diagnostics procedure (Sensor
Purge and Autocal). The frozen output value will be the value the
DMT340 transmitter reached during the 10 seconds of measurement.
After the self diagnostics procedure the outputs are operational again.
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User's Guide _______________________________________________________________________
The numbers refer to Figure 48 above:
1 = INFO shorcut button
2 = GRAPH shortcut button changes the display into a curve mode
3 = Selected quantities
From any view,
press on th
display.
Display/Keypad
Basic Display
Display shows you the measurement values of the selected quantities in
the selected units. You can select 1... 4 quantities for the numerical basic
display (see section Changing the Quantities and Units on page 103).
0706-009
Figure 48 Basic Display
NOTE
Press the INFO button (in the basic display) to see the device information
views, see section Device Information on page 111.
even in the absence of an EXIT button, a four-second
e right-hand function button takes you directly to the basic
70 ___________________________________________________________________ M210704EN-G
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Observation Period
Period for Trend/Max/Min
Calculations (Resolution)
3 hours
1,5 minutes
1 day
12 minutes
10 days
2 hours
2 months
12 hours
1 year
3 days
4 year*
12 days
Graphic History
The graphical display shows the data trend or min/max graph of the
selected quantities, one at a time. The graph is updated automatically
while measuring.
0706-01
Figure 49 Graphical Display
Trend graph: Shows you a curve of average values. Each value is a
calculated average over a period. See Table 10.
Max/min graph: Shows you the minimum and maximum values in a
form of curve. Each point shows the absolute minimum and maximum
observed during the time period represented by the data point. See Table
10 on page 71.
Table 10 Periods for Trend and Max/Min Calculations
* Shows the maximum lo gging period of the data logger module (available when data
logger module is installed)
Use the following functions in the graphical display:
- Press the NEXT button to change between the trend graph and
max/min graph for the quantities selected for display.
- Press the EXIT button to return to the basic display.
- Press the ▼▲ arrow buttons to zoom in and out in the graph window.
- Press the ◄► arrow buttons move the cursor (vertical bar) along the
time axis. The cursor mode allows you to observe individual
measuring points. The numerical value at the cursor position is shown
at the left upper corner. The right upper corner shows the time from
the present to the chosen moment (without the logger module), or the
date and time at the cursor position (when the logger module is
installed).
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User's Guide _______________________________________________________________________
Failure Message
Interpretation
Power outage
Power failure (marked also with dashed
vertical line)
No data
Quantity has not been selected for the display
System error
General device or power supply problem
T meas. error
Temperature measurement/sensor failure
RH meas. error
Humidity measurement/sensor failure
Adj. mode active
Adjustment mode active (data recorded in the
adjustment mode is not displayed)
Autocal
Autocal performed (only shown in 3 h graphs)
- If the optional data logger module is installed, you can scroll the
cursor off the screen to move to a new point on the time axis. The new
date will be displayed, and the cursor will be centered at the date
where the cursor scrolled off the screen.
0706-030
Figure 50 Graphical Display with Data Logger
If the data logger module is installed, you can move quickly on the time
axis: zoom out, move the cursor, and zoom back in.
The time that is shown below the graph is adjusted with the current time
offset of the transmitter. If you change the transmitter's date and time
setting, the displayed timestamps in the history graph change
accordingly. For an explanation of the effect of changing the date and
time manually, see section Data Logger Module on page 66.
Table 11 Graph Information Messages
A question mark after time tells you that at least one power failure
(dashed vertical line) has occurred after the chosen moment. In this case,
the actual time difference between the present and the cursor position is
not exactly known. If the data logger module is installed, the time is
known and the question marks are not present.
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Chapter 4 _________________________________________________________________ Operation
Menus and Navigation
You can change settings and select functions in the menus.
1. Open the Main Menu by pressing any of the ▲▼◄► arrow
buttons in the basic (numeric) display mode.
2. Move in the menus by using the ▲▼ arrow buttons.
3. Open a submenu with ► button.
4. Press ◄ to return to the previous level.
5. Function button EXIT returns you back to the basic display.
Adjustment menu is displayed only when ADJ button (on the
motherboard inside the transmitter) is pressed.
0706-011
Figure 51 Main Views
Some menu items, such as Relay outputs in the Interfaces menu, are
only shown if supported by the transmitter and the installed options.
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User's Guide _______________________________________________________________________
Changing the Language
1. Go back to the basic display by keeping the right-hand button
pressed for four seconds.
2. Open the Mai n menu by pressing any of the ▼▲◄► buttons.
3. Scroll to the System menu option, and press the ► button. The
menu option is indicated with the wrench symbol.
4. Scroll to the Language menu option, and press the left-hand
button. The menu option is indicated with the flag symbol.
5. Select the language with the ▼▲ buttons, and confirm the
selection by pressing the left-hand button.
6. Press the right-hand button to exit to the basic display.
Rounding Setting
Round off one decimal by using the Rounding function . The default
setting is rounding on. Rounding has no effect on quantities without
decimals.
1. Open the Main Menu by pressing any of the ▲▼◄► arrow
buttons.
2. Select ►Display and confirm by pressing the ► arrow button.
3. Select Rounding and press ON/OFF button.
4. Press EXIT to return to the basic display.
Display Backlight Setting
As a default the display backlight is always on. In the automatic mode
the backlight stays on for 30 seconds from the last press of the button.
When pressing any button, the light turns on again.
1. Open the Main Menu by pressing any of the ▲▼◄► arrow
buttons
2. Select ►Display, press the ►arrow button.
3. Select Backlight, press the CHANGE button.
4. Select On/Off/ Automatic, press the SELECT button.
5. Press EXIT to return to the basic display.
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where
xxx
=
Contrast value for display. Recommended range -9 ... 9,
default 0. Negative values make screen lighter, positive
values make it darker.
Display Contrast Sett ing
Display contrast is automatically adjusted based on the ambient
temperature. However, depending on the installation location and
viewing direction, it may be necessary to fine-tune the contrast manually.
Using Display/Keypad
1. Open the Main Menu by pressing any of the ▲▼◄► arrow
buttons.
2. Select ►Display, press the ►arrow button.
3. Select Contrast, press the ADJUST button.
4. Adjust the contrast by pressing the ◄► arrow buttons.
5. Press OK and EXIT to return to the basic display.
Using Serial Line
Use the serial line command CON to view or set the display contrast.
CON [xxx]<cr>
Example (view current contrast setting):
>con
Contrast : 0
>
Example (set contrast to 5):
>con 5
Contrast : 5
>
Keypad Lock (Keyguard)
This function locks the keypad and prevents unintentional key presses.
1. Keep pressing the left-hand function button for 4 seconds to lock
the keypad (at any display).
2. To unlock the keypad, press the OPEN button for 4 seconds.
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User's Guide _______________________________________________________________________
You can also disable the keypad completely with serial command
LOCK
114
Menu PIN Lock
You can prevent unauthorized changes of the device settings by
activating the menu PIN lock. When this function is activated, the basic
display, graphical view, and device information displays are available but
access to the menus is locked. The key symbol indicates the activation of
this feature.
1. Open the Main Menu by pressing any of the ▲▼◄► arrow
buttons.
2. Select System, press the ► arrow button.
3. Select Menu PIN, press the ON button.
4. Enter a PIN code by using the ▲▼ arrow buttons. Press OK to
confirm the setting. Now the PIN lock is on and a key symbol is
shown in a display.
5. Press EXIT to return to the basic display. Returning to the menu is
possible only by entering the correct PIN code.
NOTE
When you want to turn off the PIN lock, go to the menu by giving the
PIN code and select System, Menu PIN, press OFF button.
In case you have forgotten the PIN code, open the transmitter cover and
press the ADJ button once. Wait for a few seconds and the adjustment
menu opens. Select Clear menu PIN, press CLEAR.
. See section Locking Menu/Keypad Using Serial Line on page
.
Factory Setting s
Use the display/keypad to restore the factory settings. This operation
does not affect the adjustments. Only settings available in the menus are
restored.
1. Press any of the arrow buttons to open the Main Menu.
2. Select System by pressing the ► arrow button.
3. Select Factory settings and press the REVERT button to confirm
your selection. Press the YES button to reset all settings to the
factory defaults.
See section General Settings on page 103 for a description of the other
menu options.
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Display Alarms
The Display Alarm feature provides two independently configurable
alarms for transmitters with the display/keypad option. Each alarm tracks
a selected quantity, with freely configurable limit values. Each alarm also
has a configurable hysteresis value to prevent unnecessary triggering
when the measurement fluctuates around an alarm limit. The alarms can
be configured for any quantity supported by the transmitter. The
configuration of the Display Alarms can only be done using the
display/keypad option.
You can have the alarm activate inside or outside the specified range by
setting the limits correctly:
- To have the alarm activate when the measured quantity is outside the
specified range, set the Act. above limit higher than the Act. below
limit.
- To have the alarm activate when the measured quantity is inside the
range, set the Act. above limit lower than the Act. below limit.
The alarm limits are shown on the graph display as thicker dotted lines.
When a display alarm is activated, the automatic scaling of the graph
display always keeps the limits in view.
1103-062
Figure 52 Alarm Limits Shown on Graph Screen
When an alarm is activated, an alarm note is displayed on the display,
and the lights of the display will blink. If the data logger module is
installed, the alarm note includes the time and date of the alarm.
1103-063
Figure 53 Display Alarm Active
Multiple alarms can be active at the same time; the alarm that was
triggered first will be shown on the display. The next active alarm is
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User's Guide _______________________________________________________________________
Changes you do on the alarm editing page will take effect immediately,
and may cause an alarm to appear on the screen.
revealed when the currently shown alarm is acknowledged by pressing
the OK button.
Activated alarms are only shown on the screen; there are no alarm
messages output to the serial line. After an alarm has been
acknowledged, you must refer to the data graphs to see when the
measured quantities have exceeded the limits. You may use the optional
relay outputs as alarm outputs by configuring them separately; see
section Setting the Relay Outputs on page 133.
Configuring a Display Alarm
1. Enter the Main Menu by pressing an arrow key on the keypad.
2. Use the arrow keys to select Display, followed by Alarms, to open
the Display Alarms menu. The Display Alarms menu shows the
currently enabled and disabled alarms.
NOTE
0802-069
Figure 54 Display Alarms
3. Use the arrow keys to select an alarm to configure. The alarm
editing page opens.
4. To select a quantity for the alarm, press the Change button and
select the quantity from the list.
5. To modify or remove the alarm limit values, move the selection
over the Act. above or Act. below field and press the Set button.
You will be prompted to Modify or Remove the value.
0802-070
Figure 55 Modifying an Alarm Limit
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Chapter 4 _________________________________________________________________ Operation
where
quantity1
=
Quantity for display alarm 1. You can set any quantity
available on your transmitter; see
Table
select the following:
FAULT
ONLINE
measurement output (for example, sensor purge).
quantity2
=
Quantity for display alarm 2. Options are the same as for
quantity1.
When modifying the value, use the arrow up and down buttons to
change the value under the cursor. Left and right arrow buttons
move the cursor. Select the OK button to accept the modified
value, or Cancel to undo the modification.
6. Set a suitable Hysteresis value to prevent the alarm from being
triggered unnecessarily by small measurement changes that pass
the alarm limit repeatedly.
7. Set or clear the Alarm enable checkbox to enable or disable the
alarm.
8. Press the Exit button to leave the alarm configuration screen and
return to the basic view.
Using Serial Line
Use the serial line command ALSEL to view or set the display alarms.
ALSEL [quantity1 quantity2]<cr>
3 on page 18. In addition to quantities, you can also
– Alarm for device errors
– Alarm for sensor operations that freeze the
Example (view current display alarm settings):
>alsel ?
Al1 Tdf above: 0.00 'C
Al1 Tdf below: Al1 Tdf hyst : 1.00 'C
Al1 Tdf enabl: ON
Al2 T above: 40.00 'C
Al2 T below: Al2 T hyst : 1.00 'C
Al2 T enabl: ON
>
Table 2 on page 18 and
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User's Guide _______________________________________________________________________
Name
Description
above
If specified, the alarm goes off when the quantity value rises above
Cannot be set for fault and online alarms.
below
If specified, the alarm goes off when the quantity value decreases
Cannot be set for fault and online alarms.
hyst
Distance from setpoint amount of extra retractment needed in order
Cannot be set for fault and online alarms.
enabl
Enable (ON) or disable (OFF) the display alarm.
Table 12 ALSEL Parameters
the exact value of this setpoint. However, if above < below, the
alarm goes off at (above + hyst) and (below – hyst) instead.
below the exact value of this setpoint. However, if above < below,
the alarm goes off at (above + hyst) and (below – hyst) instead.
to regenerate alarm on the next crossing of the setpoint.
Example (set H2O and T as display alarm quantities and configure the
alarms as prompted):
>alsel h2o t
Al1 H2O above: 0.00 ppmV ? 6000
Al1 H2O below: - ?
Al1 H2O hyst : 1.00 ppmV ? 500
Al1 H2O enabl: ON ?
Al2 T above: 40.00 'C ? 30
Al2 T below: - ?
Al2 T hyst : 1.00 'C ?
Al2 T enabl: ON ?
>
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For instructions on using the MI70 Link, see the program’s online help.
MI70 Link Program for Data Handling
MI70 Link is a support program that enables you to handle the
measurement data of your Vaisala transmitter using a Windows PC.
Using the MI70 Link you can, for example:
- Monitor the transmitter’s measurement readings directly using the
real-time window function.
- Transfer recorded data from the main transmitter memory in numeric
or graphical format, for further use in a spreadsheet program (such as
Microsoft Excel) or virtually any other application. Note that the
maximum amount of data points that can be downloaded in one
transfer is 65000.
To use the MI70 Link program, you must connect your Windows PC to
the service port of the transmitter with a serial or USB cable. The MI70
Link program, and the optional connection cables, are available from
Vaisala. See section Spare Parts and Accessories on page 170.
NOTE
Follow the steps below to connect your transmitter and start using the
MI70 Link:
1. Connect your PC to the service port of the transmitter. Refer to
section Service Port Connection on page 84.
2. Check that the DMT340 is powered.
3. Start the MI70 Link program.
4. Start using the program. There is usually no need to select a COM
port manually, the MI70 Link software can detect it automatically.
VAISALA ________________________________________________________________________ 81
User's Guide _______________________________________________________________________
The numbers refer to Figure 56 above:
1 = Service port connector
2 = User Port Terminals
Serial Line Communication
Connect the serial interface by using either the user port or the service
port.
For permanent interfacing to host system, use the User Port. You can
change the serial settings and operate in RUN, STOP, POLL, and
Modbus modes.
For temporary connections use the service port. Service port is always
available with fixed serial settings.
0605-039
Figure 56 Service Port Connector and User Port Terminal on the
Motherboard
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Chapter 4 _________________________________________________________________ Operation
Parameter
Value
Bauds
4800
Parity
Even
Data bits
7
Stop bits
1
Flow control
None
RS
(LAN, WLAN, or RS
1 2 3 4 5
6 7 8 9
+
–
RxD
GND
TxD
Ch1+
Ch1–
Ch2+
Ch2–
ANALOG OUTPUTS USER PORT POWER
RS-232 10…36 V=
24 V~
IOIOI
User Port Connection
Use suitable serial cable between the user port RxD, GND and TxD
screw terminals and the PC serial port.
Table 13 Default Serial Communication Settings for the User
Port
VAISALA ________________________________________________________________________ 83
NOTE
0506-033
Figure 57 Connection Example between PC Serial Port and User
Port
Connections to pins 4,6,7 and 8 are required only if your software
requires hardware handshaking.
User Port Operating Modes
When the transmitter is powered up, it will behave according to its
configured operating mode:
- In STOP mode, the transmitter outputs the software version and the
command prompt (if echo is on).
- In RUN mode a measurement output starts immediately.
- In POLL or MODBUS mode, the transmitter does not output anything
after power-up.
For a description of the modes, see section SMODE on page 117.
-232 User Port cannot be used when a communication module
-422/485 interface) has been installed.
User's Guide _______________________________________________________________________
Service Port Connection
Connection Cables
To connect to the service port, you need a suitable cable with an RJ45
connector. Depending on the connections of your PC, you can either use
the Serial Connection Cable (optional accessory 19446ZZ) or the
USB-RJ45 Serial Connection Cable (optional accessory 219685). The
USB cable enables you to connect the transmitter to a PC via a standard
type A USB port. Note that the USB cable does not enable high speed
data transfer, since the bit rate is limited by the serial interface of the
service port.
Installing the Driver f or t he USB Cable
Before taking the USB cable into use, you must install the provided USB
driver on your PC. When installing the driver, you must acknowledge
any security prompts that may appear.
1. Check that the USB cable is not connected. Disconnect the cable if
you have already connected it.
2. Insert the media that came with the cable, or download the latest
driver from www.vaisala.com.
3. Execute the USB driver installation program (setup.exe), and
accept the installation defaults.
4. After the driver has been installed, connect the USB service cable
to a USB port on your PC. Windows will detect the new device,
and use the driver automatically.
5. The installation has reserved a COM port for the cable. Verify the
port number, and the status of the cable, using the Vaisala USB
Instrument Finder program that has been installed in the
Windows Start menu.
Windows will recognize each individual cable as a different device, and
reserve a new COM port. Remember to use the correct port in the
settings of your terminal program.
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Parameter
Value
Bauds
19200
Parity
None
Data bits
8
Stop bits
1
Flow control
None
Using the Service Port
1. Open the screws on the transmitter cover, and open the cover.
2. Connect the desired cable (serial interface cable or USB cable) to
your PC and the service port connector on the transmitter. For
location of the service port, refer to Figure 56 on page 82.
3. Open a terminal program and set the communication settings as
follows:
Table 14 Communication Settings for the Service Port
For a detailed explanation of using a terminal program, see section
Terminal Program Settings on page 93.
4. Power-up the DMT340.
LAN Communication
To enable LAN communication, a LAN or WLAN interface must be
physically connected to the network, and the networking settings must be
suitable for your network. For a description of interfaces, see sections
LAN Interface on page 64 and WLAN Interface on page 65.
The LAN and WLAN interfaces both operate by accessing the serial
interface (User Port) of the transmitter. All commands and protocols that
are available using the serial interface are available through the LAN and
WLAN interfaces; refer to section List of Serial Commands on page 96.
For instructions on how to connect using a terminal program, see section
Terminal Program Settings on page 93.
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User's Guide _______________________________________________________________________
Parameter
Description
Automatic configuration
If enabled, the transmitter will retrieve its
network settings are used instead.
Web configuration
If enabled, the settings of the interface can be
browsing to the IP address of the transmitter.
IP Address
The four part network ID of the transmitter. Must
Example value: 192.168.0.222
Netmask
Used together with the IP address to determine
A common netmask is 255.255.255.0
Gateway
IP address of the server that enables the
Example value: 192.168.0.1
MAC
The MAC address is the unique hardware
be changed.
IP Configuration
The IP settings of the LAN and WLAN interfaces are described in Table
15. The current settings can be viewed on the serial line or using the
device information display; see section Device Informatio n on page 111.
Table 15 IP Settings for the LAN and WLAN Interfaces
(DHCP)
network settings (including the IP Address) from
a server in the network. If disabled, static
changed using a web browser. The
configuration page can be accessed by
be set manually if automatic configuration is not
used.
which network the transmitter is a part of. Must
be set manually if automatic configuration is not
used.
transmitter to access other networks. Must be
set manually if automatic configuration is not
used.
address of the LAN or WLAN interface. Cannot
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Using Display/Keypad
You can configure the IP settings of the LAN and WLAN interfaces
using the display/keypad as follows:
1. Press any of the arrow buttons to open the Main Menu.
2. Press the ► arrow button to select Interfaces.
3. Press ► arrow button to select Network settings. There will be a
delay as the transmitter refreshes the network information.
4. You are now in the Network Interface menu. Selecting the IP
configuration option opens the IP configuration menu.
1102-015
Figure 58 Network Interface Menu
The Network Interface menu also allows you to configure the
Communication Protocol, enable or disable the Web
configuration option, or Disconnect all users that are currently
accessing the LAN or WLAN interface.
5. In the IP configuration menu, select Automatic configuration
(DHCP), or enter the IP address, Netmask and Gateway
manually. If automatic configuration is enabled, manual
configuration cannot be done.
0709-004
Figure 59 IP Configuration Menu
To enter a value manually, use the ▲▼ arrow buttons to select the
parameter to change, and press Change. A cursor will appear in the
first digit. Move the cursor using the ◄► arrow buttons, and
change the value under the cursor using the ▲▼ arrow buttons.
Confirm the selection by pressing OK.
6. After configuring the desired parameters, press EXIT to apply the
changes and return to the basic display.
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User's Guide _______________________________________________________________________
where
REFRESH
=
Updates the network information and displays it
DISCONNECT
=
Disconnects all current sessions
DHCP
=
ON or OFF. Enables or disables the automatic IP
configuration.
WEB
=
ON or OFF. Enables or disables the Web
Configuration page.
IP = The four part network ID of the transmitter. Must
be set manually if automatic configuration is not
used.
SUBNET
=
Used together with the IP address to determine
which network the transmitter is a part of. Must be
set manually if automatic configuration is not
used.
GATEWAY
=
IP address of the server that enables the transmitter
to access other networks. Must be set manually if
automatic configuration is not used.
Using Serial Line
Use the serial line command NET to view or set the network settings for
the LAN and WLAN interfaces. You can also refresh the network
information or disconnect all active connections.
NET [REFRESH] [DISCONNECT] [DHCP WEB] [DHCP IP SUBNET
GATEWAY WEB]<cr>
Examples:
>net refresh
OK
DHCP : OFF
IP address : 192.168.0.101
Subnet mask : 255.255.255.0
Default gateway: 192.168.0.1
Web config. : OFF
MAC address : 00:40:9d:2c:d2:05
Status : Not connected
>
>net on off
DHCP : ON
IP address : 192.168.0.104
Subnet mask : 255.255.255.0
Default gateway: 192.168.0.1
Web config. : OFF
MAC address : 00:40:9d:2c:d2:05
Status : Connected
OK
>
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Parameter
Description
SSID
The service set identifier (that is, network
… 32 characters.
Security ty pe
The security type of the wireless network. The
security key; see below.
Security key
The encryption key or passphrase that is used
with an encrypted network.
>net off 192.168.0.101 255.255.255.0 192.168.0.1 off
DHCP : OFF
IP address : 192.168.0.101
Subnet mask : 255.255.255.0
Default gateway: 192.168.0.1
Web config. : OFF
MAC address : 00:40:9d:2c:d2:05
Status : Connected
OK
>
Wireless LAN Co nfiguration
The settings of the WLAN interface are described in Table 16. The
current settings can be viewed on the serial line or using the device
information display; see section Device Informati on on page 111.
- CCMP encryption is called AES in some networking products.
- The WLAN interface supports both WPA and WPA2 (also known as
802.11i) security when either WPA-PSK mode is selected.
- If your WLAN network is using some other security method than
listed below, you must set up a temporary WLAN network with any of
these settings and then use the web configuration to set WLAN
security settings for the actual network. See section Web
Configuration for LAN and WLAN on page 92.
Table 16 Wireless LAN Settings
name) of the wireless network to connect to. 1
options are:
OPEN
OPEN/WEP
WPA-PSK/TKIP
WPA-PSK/CCMP
All other choices except OPEN require a
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Using Display/Keypad
You can configure the Wireless LAN settings using the display/keypad
as follows:
1. Press any of the arrow buttons to open the Main Menu.
2. Press the ► arrow button to select Interfaces.
3. Press the ► arrow button to select Network settings. There will be
a delay as the transmitter refreshes the network information.
4. Press the ► arrow button to select Wireless LAN settings.
0802-111
Figure 60 Wireless LAN Settings
5. The Name entry on the page shows the SSID of the currently
selected wireless network. To change the SSID, press the SET
button. Use the ▲▼ arrow buttons to change the character under
the cursor, and ◄► arrow buttons to more the cursor. Press the
OK button when done.
0802-110
Figure 61 Entering Network SSID
6. To change the currently selected Network type, select the Type
entry and press the Change button. Select the new type from the
list and press the Select button.
0802-112
Figure 62 Selecting the Wireless Network Type
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Chapter 4 _________________________________________________________________ Operation
where
SSID
=
Network name in 1 … 32 characters
TYPE
=
Security type of the wireless network. The options
are:
OPEN
OPEN/WEP
WPA
WPA-PSK/CCMP
7. If you have selected an encrypted network type (WEP or WPA),
you must enter the security key to be used. Select the
Key/passphrase entry and press the Set button. Enter the key in
the same way as the SSID, and press the OK button. With the WEP
encryption you must enter the encryption key in hexadecimal (10
hexdecimals for 64-bit encryption or 26 hexadecimals for 128-bit
encryption). A WPA key must be 8 … 63 ASCII characters.
8. After setting the wireless network parameters, press the Exit button
in the Wireless LAN Settings menu. You will be asked to confirm
the new settings. Note that when new settings are saved, all
currently active WLAN connections are disconnected.
Using Serial Line
Use the serial line command WLAN to view or set the wireless network
settings. If you set an encrypted network type, you will be asked to enter
the security key. With the WEP encryption you must enter the encryption
key in hexadecimal (10 hexdecimals for 64-bit encryption or 26
hexadecimals for 128-bit encryption) or with plain ASCII characters (5
characters for 64-bit encryption or 13 characters for 128-bit encryption).
A WPA key must be 8 … 63 ASCII characters.
WLAN [SSID TYPE]<cr>
-PSK/TKIP
Examples:
>wlan ?
Network SSID : WLAN-AP
Type : OPEN
>
>wlan accesspoint wpa-psk/tkip
Network SSID : accesspoint
Type : WPA-PSK/TKIP
WPA-PSK phrase ? thequickbrownfox
Save changes (Y/N) ? y
OK
>
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Communication Protocol
When a Telnet connection is established via the LAN or WLAN
interface, the session has the same communication mode, run interval,
poll address and echo settings as the serial port (user port) session would
have.
These settings can be changed using the display/keypad, using the serial
line (user port or service port), or on-the-fly during the Telnet session.
The display menu path to the Communication Protocol settings is:
Main Menu ► Interfaces ► Network Interface ► Communication
Protocol.
The commands for changing the settings are SMODE, INTV, ADDR,
and ECHO.
Web Configuration for LAN and WLAN
The LAN and WLAN interfaces both have a web configuration page that
is accessible using a browser. If you have not disabled the page from the
network settings, you can access it with a web browser at the IP address
of the interface. You can check the currently assigned IP address of the
interface from the device information screens (see Device Information on
page 111), or from the serial line by issuing the net ? command.
When accessing the web configuration page, you must first log in.
Username: user
Password: vaisala
The web configuration page provides similar network configuration
options as the serial line and the display/keypad. It also has additional
options for advanced users. For example, there are more options for
securing the wireless network.
If these additional options are used, they will appear as custom
configurations when viewed from the serial line or the display/keypad.
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PuTTY cannot be used to access the transmitter through the User Port if
the transmitter is configured to use the
can always use PuTTY to access the transmitter through the
1102-017
Figure 63 Web Configuration Interface for WLAN
Terminal Program Settings
NOTE
The instructions below describe how to connect to the DMT340 using the
PuTTY terminal application for Windows. Perform the necessary cabling
and configuration of the transmitter before following the instructions.
PuTTY is available for download at www.vaisala.com.
Modbus protocol. However, you
Service Port.
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Opening a Serial/USB Connection
1. Power up the DMT340 and start the PuTTY application.
2. Select the Serial & USB settings category, and check that the
correct COM port is selected in the Serial or USB line to connect
to field. Change the port if necessary.
If you are using a Vaisala USB cable, you can check the port that it
uses by clicking the USB Finder... button. This opens the Vaisala
USB Instrument Finder program that has been installed along with
the USB drivers.
3. Check that the other serial/USB line settings are correct for your
connection, and change if necessary. The default settings (shown in
Figure 64 below) are used by the Service Port of the DMT340.
0810-070
Figure 64 Opening a Serial Connection
4. Click the Open button to open the connection window and start
using the serial line.
If PuTTY is unable to open the serial port you selected, it will show
you an error message instead. If this happens, restart PuTTY and
check the settings.
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The instructions below assume that the LAN/WLAN interface on the
transmitter is correctly configured and the network connection is already
done.
Opening a Telnet Session (L AN/WLAN)
NOTE
1. Power up the instrument and start the PuTTY application. If your
transmitter acquires a network address using DHCP, wait for a
minute for this to complete, then verify the address from the
transmitter.
2. In the Session window, select the Telnet connection type.
3. Enter the IP address of your transmitter in the Host Name (or IP
address) field. Use the default Telnet port 23.
0810-071
Figure 65 Opening a Telnet Connection
4. Click the Open button to open the connection window and start
using the Telnet session.
If PuTTY is unable to connect the IP address you entered, it will
show you an error message instead. If this happens, check the
IP address and the connections, restart PuTTY, and try again.
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Command
Description
R
Start the continuous outputting
S
Stop the continuous outputting
INTV [0 ... 255 S/MIN/H]
Set the continuous output Interval (for RUN
mode)
SEND [0 ... 255]
Output the reading once
DSEND
Output the reading once from all connected
transmitters (in STOP or POLL mode)
SMODE
[STOP/RUN/POLL/MODBUS]
Set the serial interface mode
SDELAY
View or set User Port (RS232 or RS485)
answer minimum delay
SERI [baud p d s]
User Port settings (Default: 4800 E 7 1)
ADDR [0 ... 255]
Set the transmitter address (for POLL and
MODBUS modes)
NET
View or set networking parameters for LAN
and WLAN interfaces
WLAN
View or set wireless network parameters for
WLAN interface
OPEN [0 ... 255]
Open a temporarily connection to a POLL
mode device
CLOSE
Close the temporary connection (back to
POLL Mode)
Command
Description
FORM
Set the output format of SEND and R
commands
FST
Add the state of Autocal, purge and sensor
commands
SCOM
Assign a new command name that works like
the SEND command
FDATE
Add date to R and SEND outputs
FTIME
Add time to output to SEND and R outputs
List of Serial Commands
All commands can be issued either in uppercase or lowercase. In the
command examples, the keyboard input by the 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.
In the tables below, the bold text in the brackets is the default setting.
Table 17 Measurement Commands
Table 18 Formatting Commands
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warming in connection with SEND and R
Chapter 4 _________________________________________________________________ Operation
Command
Description
DIR
Lists trend log files
PLAY [0 ... 24]
Output recorded data file. Start and end times can only
yyyy-mm-dd hh:mm:ss
DSEL
Select data recording and display quantities
(1 ... 4).
DELETE
Delete all data files, including the memory of the
optional data logger module
UNDELETE
Recover the deleted files that have not been overwritten
Command
Description
PUR
Purge settings
PURGE
Start manual purge
Command
Description
AUTO
Autocal settings
AUTOCAL
Start manual autocal
Command
Description
FCRH
RH two-point adjustment
IKØ
Td/f one-point-adjustment
CT
T one or two-point adjustment
ACAL
Perform analog output adjustment
Command
Description
ASEL
Configure analog output quantities and scales
ITEST
Test analog outputs
AMODE
Display analog output mode
AERR
Change the error output
ASCL
Analog output scaling
AOVER [ON/OFF]
Extend analog output range by 10%
Command
Description
RSEL
Configure relay settings
RTEST
Test relays
Table 19 Data Recording Commands
[START END]
be specified if the data logger module is installed. The
times must be given in the following format:
Table 20 Purge Commands
Table 21 Autocalibration Commands
Table 22 Calibration and Adjustment Commands
Table 23 Setting and Testing the Analog Outputs
Table 24 Setting and Testing the Relays
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Command
Description
?
Output the information about the device
??
Output the information about the device in POLL-state
ALSEL
Set display alarms
CON
Set display contrast
CDATE
Adjust the output date/set date when adjustment
enabled
CODE
Display the order configuration code of the transmitter
CTEXT
Display the adjustment information text/set information
text when adjustment enabled
DATE
Set date.
DSEND
Output the reading, also in poll mode.
ECHO
Turn the serial interface echo ON/OFF
ERRS
Display transmitter error messages
FIND
All devices in POLL mode send their addresses
HELP
List the currently available commands
LIGHT
Set the display backlight mode
LOCK
Lock the menu or disable the keypad
MODBUS
View Modbus diagnostic counters
MODS
View information about connected modules
MOL/MOLI
View/set molecular weight par ameter
PRES
Set the value for pressure compensation
RESET
Reset the device
TEST
Self-diagnostics information
TIME
Set time.
UNIT
Display output units
VERS
Display the software version information
XPRES
Set pressure (temporarily)
Table 25 Other Commands
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