Vaisala DMT346 User Manual

USER'S GUIDE

Vaisala DRYCAP® Dewpo int Transmitters

DMT345 and DMT346

M210762EN-G

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]

P.O. Box 26 Fax: [phone]
FI-00421 Helsinki
Finland

Visit our Internet pages at www.vaisala.com.

© Vaisala 2014
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 .......................................................................... 13

About This Manual ................................................................. 13

Contents of This Manual ..................................................... 13

Version Information ............................................................. 14

Related Manuals ................................................................. 14

Documentation Conventions ............................................... 14

Safety ....................................................................................... 15

ESD Protection .................................................................... 15

Recycling ................................................................................ 16

Regulatory Compliances ....................................................... 16

EU Declaration of Conformity .............................................. 16

Transmitters with LAN or WLAN Interface .......................... 16

Transmitters with WLAN Interface ...................................... 17

Patent Notice .......................................................................... 17

Trademarks ............................................................................. 17

Software License .................................................................... 18

Warranty .................................................................................. 18

CHAPTER 2

PRODUCT OVERVIEW ................................................................................ 19

Introduction to DMT345 and DMT346 ................................... 19

Basic Features and Options ................................................ 21

Operating Principle .............................................................. 21

Structure of the Transmitter ................................................ 22

Probes and Cooling Set ...................................................... 24

CHAPTER 3

INSTALLATION ............................................................................................ 25

Selecting Location ................................................................. 25

Mounting the Housing ........................................................... 25

Standard Mounting without Moun t ing Pla te ........................ 25

Wall Mounting with Wall Mounting Kit ................................. 26

Mounting with DIN Rail Installation Ki t ................................ 29

Pole Installation with Installation Kit for Pole or Pipeline .... 30

Mounting Rain Shield with Installation Kit ........................... 31

Panel Mounting Frame ........................................................ 31

DMT345 Probe Mounting ....................................................... 33

Installation with Flange ........................................................ 33

DMT346 Probe and Cooling Set Mounting........................... 34

Description of the Cooling Set ............................................. 35

Parts of the Cooling Set ................................................. 36

General Probe and Cooling Set Mount ing Inst ruc ti ons ....... 37

Probe and Cooling Set Mounting with Process Shut

Down .............................................................................. 39

VAISALA _________________________________________________________________________ 3

User's Guide _______________________________________________________________________

Probe and Cooling Set Mounting with Process

Running .......................................................................... 39

Removing the Transmitter for Maintenance ................... 39

Wiring ....................................................................................... 40

Cable Bushings ................................................................... 40

Cable Grounding ................................................................. 41

Transmitter Housing Grounding .......................................... 42

Signal and Power Supply W iring ......................................... 42

Connections to a 24 VAC Power Supply ............................. 44

Optional Modules.................................................................... 45

Power Supply Module.......................................................... 45

Installation ...................................................................... 46

Warnings ........................................................................ 47

Galvanic Isolation of Power Supply ..................................... 50

Third Analog Output ............................................................ 50

Installation and Wiring .................................................... 51

Alarm Relays ....................................................................... 52

Installation and Wiring .................................................... 52

Selecting Relay Activatio n Stat e .................................... 52

RS-422/485 Interface .......................................................... 53

Installation and Wiring .................................................... 54

LAN Interface ....................................................................... 58

WLAN Interface ................................................................... 59

Attaching the WLAN Antenna......................................... 60

Data Logger Module ............................................................ 60

8-Pin Connector ................................................................... 62

CHAPTER 4

OPERATION ................................................................................................. 63

Getting Started ........................................................................ 63

Display/Keypad ....................................................................... 64

Basic Display ....................................................................... 64

Graphic History .................................................................... 65

Menus and Navigation ......................................................... 67

Changing the Language ................................................. 68

Rounding Setting ............................................................ 68

Display Backlight Setting ................................................ 68

Display Contrast Setting ................................................. 69

Using Display/Keypad ............................................... 69

Using Serial Line ....................................................... 69

Keypad Lock (Keyguard) ................................................ 69

Menu PIN Lock ............................................................... 70

Factory Settings ................................................................... 70

Display Alarms ..................................................................... 71

Configuring a Display Alarm ........................................... 72

Using Serial Line ............................................................ 73

MI70 Link Program for Data Handling .................................. 75

Serial Line Communication ................................................... 76

User Port Connection .......................................................... 77

User Port Operating Modes ............................................ 77

Service Port Connection ...................................................... 78

Connection Cables ......................................................... 78

Installing the Driver for the USB Cable .......................... 78

Using the Service Port .................................................... 79

LAN Communication .............................................................. 80

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IP Configuration .................................................................. 80

Using Display/Keypad .................................................... 81

Using Serial Line ............................................................ 82

Wireless LAN Configuration ................................................ 83

Using Display/Keypad .................................................... 84

Using Serial Line ............................................................ 85

Communication Protoco l ..................................................... 86

Web Configuration for LAN and WLAN ............................... 86

Terminal Program Settings ................................................. 87

Opening a Serial/USB Connectio n ................................. 88

Opening a Telnet Session (LAN/WLAN) ........................ 89

List of Serial Commands ..................................................... 90

Getting Measurement Message from Serial Line ................ 93

Starting Continuous Outputting ...................................... 93

R ................................................................................ 93

Stopping Continuous Outputting .................................... 93

S ................................................................................ 93

Outputting Reading Once .............................................. 94

Assign an Alias for the SEND Command ...................... 94

Outputting Reading Once From All Transmitters ........... 95

Communicating with a Transmitter in POLL Mode ............. 95

OPEN ............................................................................. 95

CLOSE ........................................................................... 95

Formatting Serial Line Mess age ......................................... 96

FTIME and FDATE......................................................... 96

FST................................................................................. 96

General Settings ..................................................................... 97

Changing Quantities and Units ........................................... 97

Using Display/Keypad .................................................... 97

Using Serial Line ............................................................ 98

FORM ............................................................................. 98

UNIT ............................................................................. 100

Pressure Compensation Setting ....................................... 100

Using Display/Keypad .................................................. 101

Using Buttons on Motherboard .................................... 101

Using Serial Line .......................................................... 102

XPRES and PRES .................................................. 102

Date and Time ................................................................... 103

Using Display/Keypad .................................................. 103

Using Serial Line .......................................................... 103

Data Filtering ..................................................................... 104

FILT .............................................................................. 105

Device Information ............................................................ 106

? ................................................................................... 106

LIGHT ........................................................................... 107

HELP ............................................................................ 108

ERRS ........................................................................... 108

MODS .......................................................................... 108

VERS ........................................................................... 109

Resetting the Device ......................................................... 109

Locking Menu/Keypad Using Serial Line .......................... 109

LOCK ........................................................................... 109

Serial Output Settings .......................................................... 110

Using Display/Keypad ....................................................... 110

Using Serial Line ............................................................... 111

SERI ............................................................................. 111

SMODE ........................................................................ 112

VAISALA _________________________________________________________________________ 5

User's Guide _______________________________________________________________________

ADDR ........................................................................... 112

INTV ............................................................................. 113

SDELAY ....................................................................... 113

ECHO ........................................................................... 113

Data Recording ..................................................................... 114

Selecting Data Recording Quantities ................................ 114

DSEL ............................................................................ 114

View Recorded Data .......................................................... 115

DIR ............................................................................... 115

PLAY ............................................................................ 116

Deleting Recorded Files .................................................... 117

UNDELETE .................................................................. 117

Analog Output Settings ....................................................... 118

Changing Output Mode and Range ................................... 118

Analog Output Quantities .................................................. 119

AMODE/ASEL .............................................................. 120

Analog Output Tests .......................................................... 121

ITEST ........................................................................... 121

Analog Output Fault Indication Setting .............................. 122

AERR ............................................................................ 122

Extend Analog Output Range ............................................ 123

Operation of Relays .............................................................. 123

Quantity for Relay Output .................................................. 123

Measurement-Based Relay Output Modes ....................... 123

Relay Setpoints ............................................................ 123

Hysteresis ..................................................................... 125

Relay Indicating Transmitter Error Status ......................... 125

Enabling/Disabling Re lays ................................................. 127

Indication Led Operation ................................................... 127

Setting Relay Outputs........................................................ 127

RSEL ............................................................................ 128

Testing Operation of Relays .............................................. 130

RTEST .......................................................................... 130

Sensor Functions ................................................................. 131

AutoCal .............................................................................. 131

Automatic AutoCal ........................................................ 131

Manual AutoCal ............................................................ 131

Sensor Purge ..................................................................... 132

Starting and Configuring Sensor Purge............................. 133

Using Display/Keypad (Optional) ................................. 133

Using Serial Line .......................................................... 134

PURGE .................................................................... 134

PUR ......................................................................... 134

Sensor Warming ................................................................ 135

CHAPTER 5

MODBUS .................................................................................................... 137

Overview of Modbus Protocol Support .............................. 137

Taking Modbus into Use .................................................... 138

Enabling Serial Modbus ....................................................... 139

Using Display/Keypad (Optional) ...................................... 139

Using Serial Line ............................................................... 139

Enabling Ethernet Modbus .................................................. 140

Using Display/Keypad (Optional) ...................................... 140

Using Serial Line ............................................................... 142

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Diagnostic Modbus Counters ............................................. 143

Viewing Counters Using Display/Keypad .......................... 143

Viewing Counters Using Service Port ............................... 143

Disabling Modbus ................................................................ 144

CHAPTER 6

MAINTENANCE ......................................................................................... 145

Periodic Maintenance .......................................................... 145

Cleaning ............................................................................ 145

Changing the Cooling Set Filter ........................................ 145

Error States ....................................................................... 146

Technical Support ................................................................ 148

Product Returns ................................................................... 148

CHAPTER 7

CALIBRATION AN D ADJU STMENT ......................................................... 149

Calibration ............................................................................. 149

User Calibration and Adjustment ...................................... 149

Opening and Closing Adjustment Mode ........................... 150

Adjustment Information ..................................................... 151

CTEXT and CDATE ..................................................... 151

Two-Point Relative Humidity Adjustment .......................... 152

Using Display/Keypad ....................................................... 152

Using Serial Line ............................................................... 153

FCRH ........................................................................... 153

One-Point Dewpoint Adjustment ........................................ 155

One-Point Dewpoint Adjustment Using Display/Keypad .. 155

One-point Dewpoint Adjustment Using Serial Line ........... 156

Adjusting Temperature ........................................................ 157

Adjusting Temperature Using Display/Keypad ................. 157

Adjusting Temperature Using Serial Line ......................... 158

CT................................................................................. 158

Adjusting Analog Outputs ................................................... 159

Adjusting Analog Outputs Using Display/Keypad ............. 159

Adjusting Analog Outputs Us ing Seri al Line ..................... 160

ACAL ............................................................................ 160

CHAPTER 8

TECHNICAL DATA .................................................................................... 161

Specifications ....................................................................... 161

Performance ...................................................................... 161

Technical Specifications of Optional Modules .................. 166

Power Supply Module .................................................. 166

Analog Output Module ................................................. 166

Relay Module ............................................................... 166

RS-485 Module ............................................................ 167

LAN Interface Module .................................................. 167

WLAN Interface Module ............................................... 167

Data Logger Module..................................................... 167

Spare Parts and Accessories .............................................. 168

Dimensions (mm/inch) ......................................................... 169

VAISALA _________________________________________________________________________ 7

User's Guide _______________________________________________________________________

APPENDIX A

EXAMPLE INSTALLATION OF DMT346 .................................................. 171

APPENDIX B

CALCULATION FORMULAS ..................................................................... 173

APPENDIX C

MODBUS REFERENCE ............................................................................. 177

Function Codes..................................................................... 177

Register Map ......................................................................... 178

Data Encoding ................................................................... 178

32-Bit Floating Point Format ......................................... 178

16-Bit Integer Format ................................................... 179

Measurement Data (Read-Only) ....................................... 180

Status Registers (Read-Only) ........................................... 181

Configuration Registers ..................................................... 181

Exception Status Outputs .................................................... 182

Diagnostic Sub-Functions ................................................... 183

Device Identification Objects .............................................. 184

Exception Responses .......................................................... 184

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List of Figures

Figure 1 Transmitter Body ...................................................................... 22

Figure 2 Inside the Transmitter ............................................................... 23

Figure 3 Probes, Cooling Set ................................................................. 24

Figure 4 Standard Mounting ................................................................... 25

Figure 5 Mounting with Wall Mounting Kit .............................................. 26

Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch) ............... 26

Figure 7 Mounting with Metal Wall Mounting Plate ................................ 27

Figure 8 Dimensions of the Metal Mounting Plate (in mm) .................... 28

Figure 9 Mounting with DIN Rail Installation Ki t ..................................... 29

Figure 10 Vertical Pole Installation ........................................................... 30

Figure 11 Horizontal Pole Installation ....................................................... 30

Figure 12 Mounting the Rain Shield with Installation Kit .......................... 31

Figure 13 Panel Mounting Frame ............................................................. 32

Figure 14 Panel Mounting Dimensions (mm/inch) ................................... 32

Figure 15 DMT345 Probe Dimensions (mm/inch) .................................... 33

Figure 16 Flange Installation Kit ............................................................... 33

Figure 17 DMT346 Probe Dimensions (in mm) ........................................ 34

Figure 18 Cooling Set Dimensions (in mm) .............................................. 35

Figure 19 Measurement Ranges with and without the C oo ling F in s ........ 36

Figure 20 Parts of the Cooling Set (Dimensions in mm) .......................... 36

Figure 21 Mounting Flange Dimensions (in mm) ..................................... 37

Figure 22 Installing the Probe through Process Wall ............................... 38

Figure 23 Installing Probe through Thick Walls ........................................ 38

Figure 24 Cable Bushings ........................................................................ 40

Figure 25 Grounding the Screen of Electrical Cable ................................ 41

Figure 26 Screw Terminal Block on the Motherboard .............................. 42

Figure 27 Connections to 24 VAC Power Supply ..................................... 44

Figure 28 Power Supply Module .............................................................. 45

Figure 29 Galvanic Isolation Module ........................................................ 50

Figure 30 Third Analog Output ................................................................. 50

Figure 31 Third Analog Output Selection ................................................. 51

Figure 32 Relay Module ........................................................................... 53

Figure 33 RS-422/485 Module ................................................................. 54

Figure 34 4-Wire RS-485 Bus Conn e c tions, Par t A ................................. 56

Figure 35 2-Wire RS-485 Bus .................................................................. 57

Figure 36 LAN Interface Module ............................................................... 58

Figure 37 WLAN Interface Module ........................................................... 59

Figure 38 Data Logger Module ................................................................. 61

Figure 39 Pinout of the Optional 8-Pin Connector .................................... 62

Figure 40 Basic Display ............................................................................ 64

Figure 41 Graphical Display ..................................................................... 65

Figure 42 Graphical Display with Data Logger ......................................... 66

Figure 43 Main Views ............................................................................... 67

Figure 44 Alarm Limit Shown on Graph Screen ....................................... 71

Figure 45 Display Alarm Active ................................................................ 71

Figure 46 Display Alarms ......................................................................... 72

Figure 47 Modifying an Alarm Limit .......................................................... 73

Figure 48 Service Port Connector and User Port Terminal on the

Motherboard ............................................................................. 76

Figure 49 Connection Example between PC Serial Port and User Port .. 77

Figure 50 Network Interface Menu ........................................................... 81

Figure 51 IP Configuration Menu .............................................................. 81

Figure 52 Wireless LAN Settings .............................................................. 84

Figure 53 Entering Network SSID ............................................................ 84

Figure 54 Selecting the Wireless Network Type ...................................... 84

VAISALA _________________________________________________________________________ 9

User's Guide _______________________________________________________________________

Figure 55

Web Configuration Interface for WLAN .................................... 87

Figure 56 Opening a Serial Connection .................................................... 88

Figure 57 Opening a Telnet Connection ................................................... 89

Figure 58 Pressure Set Buttons on Motherboard ................................... 101

Figure 59 Device Information on Display ................................................ 106

Figure 60 Current/Voltage Switches of Output Modules ........................ 118

Figure 61 Measurement-Based Relay Output Modes ............................ 124

Figure 62 FAULT/ONLINE STATUS Relay Output Modes ..................... 126

Figure 63 Relay Availa b i lity..................................................................... 128

Figure 64 Following AutoCal on the Display ........................................... 132

Figure 65 Sensor Purge Settings ............................................................ 133

Figure 66 Performing Sensor Purge ....................................................... 133

Figure 67 Serial Interface Settings ......................................................... 139

Figure 68 IP Configuration ...................................................................... 141

Figure 69 Wireless LAN Settings ............................................................ 141

Figure 70 Communication Protoco l ........................................................ 141

Figure 71 Modbus Counters ................................................................... 143

Figure 72 Error Indicator and Error Message ......................................... 146

Figure 73 Inserting the Sensor in Reference Humidity 1 ........................ 152

Figure 74 Waiting for Readings to Stabilize ............................................ 152

Figure 75 Following Stabilizatio n ............................................................ 155

Figure 76 Proceeding with T
Figure 77 Completing T

Adjustment ............................................ 155

d/f

Adjustment .................................................... 156

d/f

Figure 78 Dewpoint Measurement Accuracy Graph DMT345 ................ 161

Figure 79 Dewpoint Measurement Accuracy Graph DMT 346 ................ 163

Figure 80 DMT345/346 Transmitter Body Dimensions .......................... 169

Figure 81 WLAN Antenna Dimensions ................................................... 170

Figure 82 Cooling Set Installation ........................................................... 171

Figure 83 Insulation with Mineral W ool ................................................... 172

10 ___________________________________________________________________ M210762EN-G

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List of Tables

Table 1 Manual Revisions ..................................................................... 14

Table 2 Related Manuals ...................................................................... 14

Table 3 Output Quantities for DMT345 ................................................. 20

Table 4 Optional Output Quantities and for DMT345 ............................ 20

Table 5 Output Quantities for DMT346 ................................................. 20

Table 6 Connecting Twisted Pair Wires to Screw Terminals ............... 55

Table 7 4-Wire (Switch 3: On) ............................................................... 56

Table 8 2-Wire (Switch 3: Off) ............................................................... 57

Table 9 Observation Periods and Res olut io n ........................................ 60

Table 10 Wiring of the Optional 8-Pin Connector .................................... 62

Table 11 Periods for Trend and Max/Min Calculations ........................... 65

Table 12 Graph Information Messages ................................................... 66

Table 13 ALSEL Parameters ................................................................... 74

Table 14 Default Serial Communication Settings for User Port .............. 77

Table 15 Communication Settings for the Service Port .......................... 79

Table 16 IP Settings for the LAN and WLAN Interfaces ......................... 80

Table 17 Wireless LAN Settings .............................................................. 83

Table 18 Measurement Commands ........................................................ 90

Table 19 Formatting Commands ............................................................. 90

Table 20 Data Recording Commands ..................................................... 91

Table 21 Purge Commands .................................................................... 91

Table 22 Autocalibration Commands ...................................................... 91

Table 23 Calibration and Adjustment Commands ................................... 91

Table 24 Setting and Testing the Analog Outputs .................................. 91

Table 25 Setting and Testing the Relays ................................................ 91

Table 26 Other Commands ..................................................................... 92

Table 27 FORM Command Modifiers...................................................... 99

Table 28 Conversion Factors for Pressure Units .................................. 102

Table 29 Filtering Levels ....................................................................... 104

Table 30 Selection of Output Modes ..................................................... 112

Table 31 Relay State Examples ............................................................ 127

Table 32 Supported Modbus Variants ................................................... 137

Table 33 Error Messages ...................................................................... 147

Table 34 Indicator Led Functions .......................................................... 150

Table 35 Dewpoint Specifications DMT345 .......................................... 161

Table 36 Temperature Specifications DMT345 ..................................... 162

Table 37 Relative Humidity Specifications DMT345 ............................. 162

Table 38 Mixing Ratio Specifications DMT345 ..................................... 162

Table 39 Dewpoint Specifications DMT346 .......................................... 162

Table 40 Mixing Ratio Specifications DMT346 ..................................... 163

Table 41 Operating Environment Specifications (Both Models) ........... 163

Table 42 Inputs and Outputs Specifications (Both Models) .................. 164

Table 43 Mechanics Specifications (Both Models) ............................... 165

Table 44 Standard Probe Cable Lengths and Approximate Transmitter

Weight (in kg/lb) ..................................................................... 165

Table 45 Spare Parts and Accessories ................................................. 168

Table 46 Supported Function Codes..................................................... 177

Table 47 DMT345/346 Modbus Register Blocks ................................... 178

Table 48 Measurement Data Registers................................................. 180

Table 49 Status Registers ..................................................................... 181

Table 50 Configuration Parameter Registers ........................................ 181

Table 51 Configuration Flag Registers .................................................. 182

Table 52 Exception Status Outputs ....................................................... 182

VAISALA ________________________________________________________________________ 11

User's Guide _______________________________________________________________________

Table 53

Table 54 Modbus Device Identification .................................................. 184

Table 55 Modbus Exception Responses ............................................... 184

Modbus Diagnostics ............................................................... 183

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Chapter 1 _________________________________________________________ General Information

CHAPTER 1

GENERAL INFORM ATION

This chapter provides general notes for the manual and the product.

About This Manual

This manual provides information for installing, operating, and
maintaining Vaisala DRYCAP® Dewpoint Transmitters DMT345 and
DMT346.

Contents of This Manual

This manual consists of the following chapters:

- Chapter 1, General Information, provides general notes for the manual

and the product.

- Chapter 2, Product Overview, introduces the features and advantages

of the Vaisala DRYCAP® Dewpoint Transmitters DMT345 and

DMT346.

- Chapter 3, Installation, provides you with information that is intended

to help you install this product.

- Chapter 4, Operation, contains information that is needed to operate

this product.

- Chapter 5, Modbus, contains information that is needed when

operating the transmitter using the Modbus protocol.

- Chapter 6, Maintenance, provides information that is needed in basic

maintenance of the product. Possible error states and situations, their

probable causes and remedies are described in this chapter. This

chapter also contains contact information for Vaisala Technical

Support.

- Chapter 7, Calibration and Adjustment, provides you with instructions

on how to calibrate and adjust Vaisala DRYCAP® Dewpoint

Transmitters DMT345 and DMT346.

- Chapter 8, Technical Data, provides the technical data of the product.

- Appendix A, Example Installation of DMT346, illustrates an example

installation of DMT346 transmitter into a process.

VAISALA ________________________________________________________________________ 13

User's Guide _______________________________________________________________________

Manual Code

Description

M210726EN-G

June 2014. This manual. Added Sensor Saturation

completing T

d/f

adjustment, small corrections.

M210726EN-F

December 2013. Previous vers io n. Added new

small corrections.

M210726EN-E

Applicable from transmitter software version 5.10

temperature range.

Manual Code

Manual Name

M010091EN

Vaisala DRYCA P® Hand-Held Dewpoint Meter
DM70 User's Guide

M210185EN

Humidity Calibrator HMK15 User's Guide

Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury
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
important data could be lost.

- Appendix B, Calculation Formulas, contains the formulas used for the
calculated output quantities.

- Appendix C, Modbus Reference, describes the Modbus functions and
data of the transmitter.

Version Information

Table 1 Manual Revisions

Rate (SSR) and Sensor Temperature (Ts) to the list
of Modbus registers, corrected the screenshot in

command descriptions: ALSEL, AOVER, CON,
DSEND, and MODS. Updated FILT command
description. Updated technical specification. Various

onward. Added Modbus protocol. Updated serial
line command descriptions. Updated storage

WARNING

CAUTION

Related Manuals

Table 2 Related Manuals

Documentation Conventions

Throughout the manual, important safety considerations are highlighted
as follows:

or even

14 ___________________________________________________________________ M210762EN-G

Chapter 1 _________________________________________________________ General Information

Note highlights important information on using the

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 with applicable
legislation.

NOTE

Safety

WARNING

CAUTION

product.

The DMT345/346 Dewpoint and Temperature Transmitter delivered to
you has been tested for safety and approved as shipped from the factory.
Note the following precautions:

ESD Protection

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 ________________________________________________________________________ 15

User's Guide _______________________________________________________________________

Recycle all applicable material.

Dispose of the unit according to statutory regulations. Do not dispose of
with regular household refuse.

Recycling

Regulatory Compliances

EU Declaration of Confo rmity

Vaisala DRYCAP® Humidity and Temperature Transmitters DMT345
and DMT346 are 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 Interfa ce

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

16 ___________________________________________________________________ M210762EN-G

Chapter 1 _________________________________________________________ General Information

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.

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

Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are
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.

VAISALA ________________________________________________________________________ 17

User's Guide _______________________________________________________________________

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.

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.

18 ___________________________________________________________________ M210762EN-G

Chapter 2 ___________________________________________________________ Product Overview

CHAPTER 2

PRODUCT OVERVIE W

This chapter introduces the features and advantages of the Vaisala
DRYCAP® Dewpoint Transmitters DMT345 and DMT346.

Introduction to DMT345 and DMT346

The DMT345 and DMT346 transmitters incorporate the advanced
Vaisala DRYCAP® technology, which enables reliable and accurate
dewpoint measurement. Both transmitters also feature the AutoCal
function which provides excellent long term stability of the
measurement.

The DMT345 is designed for measurement of relative humidity in
temperatures up to 180 °C. The transmitter outputs dewpoint/frostpoint
(Td/f), mixing ratio (x), volume concentration (ppm), relative humidity
(RH), and temperature (T).

The DMT346 is a high-performance instrument for measurement of
dewpoint and mixing ratio in temperatures up to 350 °C.

DMT346 also outputs sensor saturation rate (SSR) and temperature
(TS = T
sensor is cooled, these values do not represent true process conditions,
hence they cannot be used for process control. Nevertheless, they provide
a valuable aid for calibration and for checking the cooling effect.

For quantities measured by DMT345, see Table 3 on page 20. For the
optional calculated quantities measured by DMT345, see Table 4 on page

20.

For quantities measured and calculated by DMT36, see Table 5 on page

20.

) of the cooled Vaisala DRYCAP® sensor. Because the

Sensor

VAISALA ________________________________________________________________________ 19

User's Guide _______________________________________________________________________

Quantity

Abbreviation

Metric Unit

Non-Metric Unit

Dewpoint/frost point temperature (T

d/f

)

TDF

ºC

ºF

Mixing ratio (x)

X

g/kg

gr/lb

Relative humidity RH

RH

%RH

%RH

Temperature T

T

ºC

ºF

Quantity

Abbreviation

Metric Unit

Non-Metric Unit

Parts per million

H2O

ppmv/ ppmw

ppmv/ ppmw

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

Quantity

Abbreviation

Metric Unit

Non-Metric Unit

Dewpoint temperature (T

d/f

)

TDF

ºC

ºF

Mixing ratio (x)

X

g/kg

gr/lb

Sensor saturation rate

SSR

% - Sensor temperature

TS

ºC

ºF

Table 3 Output Quantities for DMT345

Table 4 Optional Output Quantities and for DMT345

Table 5 Output Quantities for DMT346

20 ___________________________________________________________________ M210762EN-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, optional third analog output

- Installation accessories

- DMT345: mounting flange

- DMT346: cooling set for high temperature applications.

- User friendly display and keypad interface (optional)

- Different 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

Operating Principle

The DMT345/346 transmitter incorporates the Vaisala DRYCAP®
sensor together with a combined temperature measurement with a PT100
resistive temperature sensor. The operating principle of the DRYCAP®
sensor is based on the changes in capacitance as its thin polymer film
absorbs water molecules.

The DMT345/346 transmitter measures water vapor directly and gives
thus accurate results of moisture in the process. In DMT346, the sensor is
cooled down with a cooling set which makes it possible to use a polymer
sensor in very high temperatures, for example, +100 ... +350 °C. With
this technique, no complicated sampling systems are needed. The cooling
set is thermally isolated from the process itself. The temperature of the
sensor is cooled down which increases the sensor saturation rate.

Sensor saturation rate and temperature are then measured, and the
transmitter calculates the dewpoint and the mixing ratio on the basis of
those readings.

Note that for DMT346, SSR and temperature values do not represent the
process itself as they are measured after cooling. Dewpoint and mixing
ratio, however, are independent of temperature and remain unchanged.

The dewpoint measurement range is -25 ... +100 °C.

VAISALA ________________________________________________________________________ 21

User's Guide _______________________________________________________________________

The following 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

22 ___________________________________________________________________ M210762EN-G

Chapter 2 ___________________________________________________________ Product Overview

The following 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 and Manual AutoCal buttons with indicator
LED and pressure set buttons.

0604-006

Figure 2 Inside the Transmitter

VAISALA ________________________________________________________________________ 23

User's Guide _______________________________________________________________________

*) = Optional mounting flange for DMT345 probe

Probes and Cooling Set

0604-007

Figure 3 Probes, Cooling Set

Figure 3 above shows from left to right: DMT345 probe, DMT346 probe
and the cooling set. For probe cable lengths, see Table 44 on page 165.

24 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

CHAPTER 3

INSTALLATION

This chapter provides you with information that is intended to help you
install this product.

Selecting Location

Finding a suitable site for the dewpoint measurement probe is important
for getting representative process or environmental measurements. The
location of the probe should provide a good representation of the area of
interest. Also select a location that is as clean as possible. Air should
circulate freely around the sensor.

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 ________________________________________________________________________ 25

User's Guide _______________________________________________________________________

The following 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 the transmitter 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.

0604-009

Figure 5 Mounting with Wall Mounting Kit

Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch)

26 ___________________________________________________________________ M210762EN-G

0804-065

Chapter 3 ________________________________________________________________ Installation

The following numbers refer to Figure 7 above:

1 = Mount the plate to wall with 4 screws M8 (not provided)

2 = Fasten the transmitter 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.

Metal mounting plate is included in rain shield with installation kit and
installation kit for pole or pipeline.

0604-011

Figure 7 Mounting with Metal Wall Mounting Plate

VAISALA ________________________________________________________________________ 27

User's Guide _______________________________________________________________________

0604-012

Figure 8 Dimensions of the Metal Mounting Plate (in mm)

28 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

Mounting with DIN Rail Installation Kit

DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners and
2 screws M4 × 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 the transmitter 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.

0604-013

Figure 9 Mounting with DIN Rail Installation Kit

VAISALA ________________________________________________________________________ 29

User's Guide _______________________________________________________________________

The following numbers refer to Figure 10 above:

1 = U-bolts (2 pcs) M8 (provided) for 30 ... 102 mm poles.

2 = Mounting nuts M8 (4 pcs)

The following numbers refer 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 27.

0604-014

Figure 10 Vertical Pole Installation

0604-015

Figure 11 Horizontal Pole Installation

30 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

The following 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 transmitter to the mounting plate with 4 fixing screws
(provided)

Mounting Rain Shield with Inst a lla t ion Kit

The rain shield is highly recommended for outdoor installations,
especially for transmitters with the display/keypad option.

0604-016

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.

4. Remove the paper protecting the adhesive tape on the frame, and

attach the frame around the transmitter. Refer to Figure 13 on page

32.

VAISALA ________________________________________________________________________ 31

User's Guide _______________________________________________________________________

The following numbers refer to Figure 13 above:

1 = Panel (not included)

2 = Panel mounting frame

0704-002

Figure 13 Panel Mounting Frame

0804-083

Figure 14 Panel Mounting Dimensions (mm/inch)

32 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

The following numbers refer to Figure 16 above:

1 = Process or duct wall

2 = Flange

3 = Sealing ring

4 = Probe

DMT345 Probe Mounting

0604-018

Figure 15 DMT345 Probe Dimensions (mm/inch)

Installation with Flange

The DMT345 is a small size (d = 12 mm) general purpose probe suitable
for installation through process or duct walls with the flange installation
kit available from Vaisala.

The duct installation kit includes a flange, a sealing ring and screws for
attaching the flange to the process or duct wall (Vaisala order code:

210696).

0604-019

Figure 16 Flange Installation Kit

VAISALA ________________________________________________________________________ 33

User's Guide _______________________________________________________________________

When the temperature difference between the process or duct and the
surroundings is large, the probe must be
or duct as possible. This prevents errors caused by heat conduction in the
probe cable.

When the DMT345/346 is installed in a process with a pressure
differing from the selected operating pressure at the time of orde
please enter the pressure value of the process into the transmitter
memory.

-

-

-

­Se

using

The following numbers refer to Figure 17 above:

1 = Stainless steel grid

2 = Cable (length 2 m, 5 m or 10 m)

22.5

ø1

334.5

ø13.5

357

1 2

NOTE

installed as deep in the process

NOTE

ring,

You can enter the value in the following ways:

using the display/keypad option
using the buttons on the motherboard
using the serial line
using the Modbus protocol

e section Pressure Compensation Setting on page 100. If you are

Modbus, see section Configuration Registers on page 181.

DMT346 Probe and Cooling Set Mounting

0604-020

Figure 17 DMT346 Probe Dimensions (in mm)

34 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

Make sure that the upper limit of the dewpoint measurement range is not
exceeded in low temperatur

304

164

112.5

15

8

27.5

ø20

125

ø105

ø118

ø28

120

40.6

mounting
flange

sintered
filter

ø88.9

(fixed on top of
the cooling set)

cooling element

cooling fins

Description of the Cooling Set

Figure 18 Cooling Set Dimensions (in mm)

The cooling set consists of a cooling element and removable cooling fins.
The cooling fins are meant to be installed in applications where the
process temperature and dewpoint are continuously in the range indicated
in Figure 19 on page 36 (Measurement Ranges with and without the
Cooling Fins). However, if there is a possibility that the dewpoint is
above this range, the measurements have to be taken without the cooling
fins in order to avoid condensation.

The flow rate and ambient temperature have an effect on the cooling rate.
In Figure 19 on page 36, it is assumed that ambient temperature is
+25 °C. When ambient temperature is raised by +10 °C, the measurement
ranges with and without cooling fins rise approximately +6 °C.
Correspondingly, every -10 °C change in ambient temperature changes
the ranges by approximately -6 °C. It is recommended that after installing
the transmitter without the cooling fins, the transmitter is allowed to
stabilize and then the SSR reading is checked either from the local
display or with a terminal connected to an RS line. If the SSR reading is
below 20 %, it is recommended that the cooling fins are installed.

NOTE

es as this would lead to condensation.

VAISALA ________________________________________________________________________ 35

User's Guide _______________________________________________________________________

flange

flange

15° 22 172

A

A

SECTION

A-A

cooling
bush

screen
tube

104.5

cooling
profile

M6×60 DIN912
(AISI 316)

15

ø76

cooling
bar

ø28

ø118

ø105

NOTE

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.

0604-022

Figure 19 Measurement Ranges with and without the Cooling

Parts of the Cooling Set

0604-023

Figure 20 Parts of the Cooling Set (Dimensions in mm)

Fins

36 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

lengthening
piece (pipe)

max. 50 125 8

2

ø105

ø88.9

ø84.9

ø118

welding mounting

pipe

M6×16 DIN912
(AISI 316)

0605-023

Figure 21 Mounting Flange Dimensions (in mm)

General Probe and Cooling Set Mounting Instructions

NOTE

Follow these general mounting instructions to make the installation. Note
the additional instructions in the following sections regarding specific
situations (mounting with process shut down, mounting with process
running, removing the transmitter for maintenance).

Appendix A, Example Installation of DMT346 on page 171 provides
photographs of installating DMT346 transmitter through a process wall.

The probe should be installed horizontally whenever possible in order to
ensure the best possible performance of the cooling set. Install the probe
according to the following instructions (see also Figure 22 on page 38):

1. Make a round 89.5 + 0.5 mm hole on the process wall.

2. Weld the tube of the mounting flange tightly on the inner metal

plate of the process wall. If the process wall is more than 125 mm
thick, a lengthening piece (max. 50 mm) can be welded on the
mounting tube (for walls thicker than 175 mm, see Figure 23 on
page 38).

3. The cooling set is mounted in a vertical position. Tighten the

screws properly in order to ensure a thermal contact.

4. Unfasten the locking screws on the cooling bar so that you can

push the probe into the bar.

Push the probe deep enough: make sure that the marking hole meets the
end of the bar.

VAISALA ________________________________________________________________________ 37

User's Guide _______________________________________________________________________

120

cooling bar

sealing material
(for example,
mineral wool)

PROCESS
(t

max

= 350 °C)

mounting flange

to be
welded

cooling
sleeve

ø89.5 + 0.5

DRYCAP

®

sensor

O-ring FPM

protective
tube

channel with
mineral wool

125

(max. 175 mm)

PROBE

cooling
fins

locking screws
of the probe
M4×6 DIN 916
(AISI 316)

marking
hole

8

40.6

to be welded

ø89.5 + 0.5

lengthening
piece

inner plate of the
process wall

wall thickness

< 160

plate ring plate pipe

the flange is fixed
with screws or by
spot welding

cooling
profile

~45º

ø118

NOTE:
Make sure that
the cooling profile
does not cover the
locking screws

5. Lock the probe in place by tightening the locking screws on the
bar.

38 ___________________________________________________________________ M210762EN-G

0604-024

Figure 22 Installing the Probe through Process Wall

0604-025

Figure 23 Installing Probe through Thick Walls

Chapter 3 ________________________________________________________________ Installation

Probe and Cooling Set Mounti ng w ith Process Shut Down

Complete the entire mounting process as instructed on page 37.

Probe and Cooling Set Mounti ng w ith Process Running

Follow this procedure to reduce the amount of condensation that builds
up in the installation hole.

1. First mount the cooling element (and fins) to warm it up; tightly

plug the hole for the probe in the cooling element for the duration
of the warmup period.

2. After a few hours, complete the installation by installing the probe.

Removing the Transmitter f or Mai ntena nc e

If you remove the transmitter from the process to send it to service etc.,
leaving the cooling set in its place, make sure you plug tightly the hole
for the probe in the cooling element. This will lessen the amount of
condensation that builds up in the hole.

VAISALA ________________________________________________________________________ 39

User's Guide _______________________________________________________________________

The following numbers refer to Figure 24 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
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

0605-026

Figure 24 Cable Bushings

environment it is recommended to use

40 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

Cable Grounding

Ground the screen of the electrical cable properly to achieve the best
possible EMC performance.

0605-027

Figure 25 Grounding the Screen of Electrical Cable

Refer to Figure 25 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 (items 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

(items 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. Install the domed cap nut (item 1) onto the lower part (item 5).

VAISALA ________________________________________________________________________ 41

User's Guide _______________________________________________________________________

The following numbers refer to Figure 26 above:

1 = Supply terminals POWER 10 ... 35 VDC = 24 V~

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 22. 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, DMT345/346 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 62.

0605-028

Figure 26 Screw Terminal Block on the Motherboard

WARNING

42 ___________________________________________________________________ M210762EN-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 77.

4. When wiring the optional modules, see the corresponding section

for instructions:

- Installation and Wiring of RS-422/485 Interface on page 54

- Installation and Wiring of Alarm Relays on page 52

- Third Analog Output on page 50

- LAN Interface on page 58

- WLAN Interface on page 59

5. Connect the power supply wires to the connectors:

POWER 10 ... 35 V = 24 V∼ (+) and (–) terminals. ( If using AC
voltage, always connect phase (~) to power supply (+) and 0 to
power supply (–) ). When wiring the power supply module, see
section Power Supply Module on page 45.

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 ________________________________________________________________________ 43

User's Guide _______________________________________________________________________

24

To prevent fire and/or damage, if either 24
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 27 on page 44). 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 27).

CAUTION

VAC POWER SUPPLY USE

VAC wire is grounded or

-", "0", or "GND" terminal of any other device, you

-" terminal also on this instrument.

Figure 27 Connections to 24 VAC Power Supply

44 ___________________________________________________________________ M210762EN-G

0703-041

Chapter 3 ________________________________________________________________ Installation

The following numbers refer to Figure 28 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

terminals 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.

0605-030

Figure 28 Power Supply Module

POWER 10 ... 35V 24V

VAISALA ________________________________________________________________________ 45

User's Guide _______________________________________________________________________

Do not detach the power supply module from the transmitter when the
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 of the power module in Figure 2 on page 23.

4. Connect the wires from the terminals of the power supply module
marked with + and – to the terminals POWER 10 ... 35V = 24 V~
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

46 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

Warnings

Dieses Produkt entspricht der Niederspannungsrichtlinie (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 i st.

- Verbinden Sie das Netzmodul nur mit der Spannungsquelle, wenn es im Messwertgeber

DMT345/346 montiert ist.

- Das Erdungskabel muss zum Schutz immer angeschloss en sein.

Ce produit est conforme à la Directive relative à la Basse Tension (2006/95/EEC).

- Seul un électricien compétent est habilité à racco rder le module d’alimentation au secteur.

- Ne pas détacher le module d’alimentation du tran smetteur lorsqu’il est en service.

- Ne pas raccorder le secteur au module d’alimentation lorsque celui-ci n’est pas i nstallé dans le

transmetteur DMT345/346.

- 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

DMT345/346 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 DMT345/346-

mätaren

- Anslut alltid en skyddande jordningsplint.

Questo prodotto è conforme alla Direttiva sul basso voltaggio (2006/95/CEE).

- La conduttura elettrica può essere collegat a 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 modu lo di alimentazione elettrica se non è installato nel

trasmettitore DMT345/346.

- Collegare sempre il morsetto protettivo a terra!

VAISALA ________________________________________________________________________ 47

User's Guide _______________________________________________________________________

Dette produkt er i overensstemmelse med dire ktivet 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

DMT345/346- 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 modul e van de transmitter los te koppelen wanneer de

stroom aan is.

- Het is niet toegestaan de stroom aan de stroomtoevoer module aan te sluiten als deze niet in

een DMT345/346-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 d e alimentación cuando no esté instalado en

el transmisor DMT345/346.

- Conecte siempre el terminal de protección de con exi ón 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 DMT345/346-tüüpi

saatjasse paigaldatud.

- Ühendage alati kaitsev maandusklemm!

Ez a termék megfelel a Kisfeszültségű villamos termékek irányelvnek
(2006/95/EGK).

- A hálózati feszültséget csak feljogosított elektrotechnikus csatlakoztathatja a

tápegységmodulra.

- A bekapcsolt távadóról ne csatolja le a tápegységmodult.

- Ne csatlakoztassa a háló zati feszültséget a tápegységmodulhoz, ha az nincs beépítve a

DMT345/346 távadóba.

- Feltétlenül csatlakoztasson földelő védőkapcsot!

48 ___________________________________________________________________ M210762EN-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 DMT345/346 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 DMT345/346 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 DMT345/346.

- 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

DMT345/346.

- Vždy zapojte ochrannou zemnící svorku!

VAISALA ________________________________________________________________________ 49

User's Guide _______________________________________________________________________

Galvanic
supply module. Note also that these two modules are physically
incompatible
installed, there is no room to close the transmitter cover completely.

The following numbers refer to Figure 30 above:

1 = Flat cable pins

2 = Screw terminals for signal line

3 = DIP switches to select the output mode and range

Galvanic Isolation of Power Supply

If galvanic isolation of the power supply line from the output signals is
needed, DMT345/346 can be ordered with optional galvanic isolation
module. This module prevents harmful grounding loops.

NOTE

isolation module is not needed when using the AC power

to be installed at the same time. If both modules are

0605-031

Figure 29 Galvanic Isolation Module

Third Analog Output

0503-030

Figure 30 Third Analog Output

50 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

Installation and Wiring

1. Disconnect the power. In case the analog output module is installed

in the factory, continue with the step 4.

2. Open the transmitter cover and and fasten the analog output module

to the position for MODULE 2 with four screws. Refer to Figure 2
on page 23.

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

Only one of the switches 1 … 2 can be ON at a time.
Only one of the switches 3 ... 7 can be ON at a time.

0508-029

Figure 31 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 119.
For testing the analog output, see Section Analog Output Tests on
page 121. For fault indication setting, see section Analog Output
Fault Indication Setting on page 122.

VAISALA ________________________________________________________________________ 51

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 is 50 V.

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

DMT345/346 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

166.

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 23.

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.

CAUTION

5. Take out the protective plug from the cable gland and thread the
relay wires.

6. Connect the wires to the screw terminals: NO, C, and NC.

Selecting Relay Activation State

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 123.

52 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

The following numbers refer to Figure 32 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
relay terminals.

RS
connected when RS
normally.

WARNING

WARNING

0605-032

Figure 32 Relay Module

both the transmitter and the voltage connected to the

Do not connect the mains power to relay unit without grounding the
transmitter.

RS-422/485 Interf ace

The RS-422/485 interface enables communication between an RS-485
network and the DMT345/346 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

VAISALA ________________________________________________________________________ 53

-232 User Port on DMT345/346 main board cannot be used and

-485 module is connected. Service port operates

User's Guide _______________________________________________________________________

The following numbers refer to Figure 33 above:

1 = Flat cable pins

2 = Selection switches

3 = Screw terminals for wiring

1

2

3

1102-023

Figure 33 RS-422/485 Module

NOTE

The data lines on earlier versions of the RS-422/485 module are marked
A and B instead of D1+ and D0-. When the line is idle, D1+ has positive
voltage compared to D0-.

When connecting the module, be prepared to swap the D1+ and D0­wires if you have a communication problem.

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 6:

54 ___________________________________________________________________ M210762EN-G

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.

Table 6 Connecting Twisted Pair Wires to Screw

Terminals

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 transmitter to a

master computer, enable the internal termination of DMT345/346
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).

NOTE

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 DMT345/346
through terminals Rx D1+ and Rx D0- and receives data from
DMT345/364 through terminals Tx D1+ and Tx D0-.

VAISALA ________________________________________________________________________ 55

User's Guide _______________________________________________________________________

RS-485 master

Data

DMT345/346

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
Te rm o ff
Te rm o ff
2/4 wire on
RS422 off

Tx D0­Tx D1+
Common
Rx D0­Rx D1+

Switch
Te rm o ff
Te rm o ff
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 34 4-Wire RS-485 Bus Connections, Part A
Table 7 4-Wire (Switch 3: On)

56 ___________________________________________________________________ M210762EN-G

Chapter 3 ________________________________________________________________ Installation

RS-485 master

Data

DMT345/346

D1+

↔

D1+

D0- ↔ D0-

Termination

Termination

Junction

box

Junction

box

Junction

box

120R
D0­D1+
Common

Switch
Te rm o ff
Te rm o ff
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
Te rm o ff
Te rm o ff
2/4 wire off
RS422 off

Common
D0­D1+

120R

Twisted pair Common line

Figure 35 2-Wire RS-485 Bus
Table 8 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 ________________________________________________________________________ 57

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 80. 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 86.

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.

58 ___________________________________________________________________ M210762EN-G

0709-003

Figure 36 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
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 86.

0802-103

Figure 37 WLAN Interface Module

in trusted network

-based connection over

VAISALA ________________________________________________________________________ 59

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 81 on page 170.

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 65 and Data
Recording on page 114.

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 9 below).

Table 9 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.

60 ___________________________________________________________________ M210762EN-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 38 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 ________________________________________________________________________ 61

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 39 Pinout of the Optional 8-Pin Connector

Table 10 Wiring of the Optional 8-Pin Connector

62 ___________________________________________________________________ M210762EN-G

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 section Pressure Compensation Setting on
page 100 for instructions on how to set the pressure.

Start-up time for DMT345/346 transmitter is in total about 6 minutes.
The outputs (serial and analog) are activated 3 seconds after powering up
the transmitter. 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
transmitter reached during the 10 seconds of measurement. After the self
diagnostics procedure the outputs are operational again.

VAISALA ________________________________________________________________________ 63

User's Guide _______________________________________________________________________

The numbers refer to Figure 40 above:

1 = INFO shortcut button

2 = GRAPH shortcut button changes the display into a curve
mode

3 = Selected quantities

From any view, even in the absence of an
press on the right
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 Quantities and Units on page 97).

0605-036

Figure 40 Basic Display

NOTE

Press the INFO button (in the basic display) to see the device information
views, see section Device Information on page 106.

EXIT button, a four-second

-hand function button takes you directly to the basic

64 ___________________________________________________________________ M210762EN-G

Chapter 4 _________________________________________________________________ Operation

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.

0706-028

Figure 41 Graphical Display
Trend graph: Shows you a curve of average values. Each value is a

calculated average over a period. See Table 11 below.
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
11 below.

Table 11 Periods for Trend and Max/Min Calculations

* Shows the maximum logging 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).

VAISALA ________________________________________________________________________ 65

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 42 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 60.

Table 12 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.

66 ___________________________________________________________________ M210762EN-G

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 the ► 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 43 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.

VAISALA ________________________________________________________________________ 67

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 Main 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 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 com

LOCK

109

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.

mand

. See section Locking Menu/Keypad Using Serial Line on page

.

Factory Settings

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. Open the Main Menu by pressing any of the ▲▼◄► arrow

buttons.

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 97 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 44 Alarm Limit 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 45 Display Alarm Active

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Changes you do on the alarm editing page will take effect immediately,
and may cause an alarm to appear on

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
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 Relay Outputs on page 127.

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 46 Display Alarms

3. Use the arrow keys to select an alarm to configure. The alarm
editing page opens.

the screen.

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.

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where

quantity1

=

Quantity for display alarm 1. You can set any quantity
available on your transmitter; see
quantities, you can also select the following:

FAULT
ONLINE
measurement output (for example, sensor purge).

quantity2

=

Quantity for display alarm 2. Options are the same as for
quantity1.

0802-070

Figure 47 Modifying an Alarm Limit

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>

page 20. In addition to

– Alarm for device errors

– Alarm for sensor operations that freeze the

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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.

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 13 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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F

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 168.

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 78.

2. Check that the transmitter 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.

or instructions on using the MI70 Link, see the program’s online help.

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User's Guide _______________________________________________________________________

The following numbers refer to Figure 48 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 48 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

User port cannot be used when the RS

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 14 Default Serial Communication Settings for User Port

NOTE

NOTE

VAISALA ________________________________________________________________________ 77

0506-033

Figure 49 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.

-485 module is connected.

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 112.

-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 USB­RJ45 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 Cabl e

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 48 on page 76.

3. Open a terminal program and set the communication settings as

follows:

Table 15 Communication Settings for the Service Port

For a detailed explanation of using a terminal program, see section
Terminal Program Settings on page 87.

4. Power-up the transmitter.

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Parameter

Description

Automatic configuration

If enabled, the transmitter will retrieve its network

used instead.

Web configuration

If enabled, the settings of the interface can be

of the transmitter.

IP Address

The four part network ID of the transmitter. Must be

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 transmitter

Example value: 192.168.0.1

MAC

The MAC address is the unique hardware address of
the LAN or WLAN interface. Cannot be changed.

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 58 and WLAN Interface on page 59.

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 90.
For instructions on how to connect using a terminal program, see section
Terminal Program Settings on page 87.

IP Configuration

The IP settings of the LAN and WLAN interfaces are described in Table

16. The current settings can be viewed on the serial line or using the

device information display; see section Device Informatio n on page 106.

Table 16 IP Settings for the LAN and WLAN Interfaces

(DHCP)

settings (including the IP Address) from a server in
the network. If disabled, static network settings are

changed using a web browser. The configuration
page can be accessed by browsing to the IP address

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.

to access other networks. Must be set manually if
automatic configuration is not used.

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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 50 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 51 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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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
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
GATEWA Y WE B]<cr>

manually if automatic configuration is not

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 type

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 17. The
current settings can be viewed on the serial line or using the device
information display; see section Device Information on page 106.

- 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 86.

Table 17 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 s ettin gs.

0802-111

Figure 52 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 53 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 54 Selecting the Wireless Network Type

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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 In for mat io n on
page 106), 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 Service

1102-017

Figure 55 Web Configuration Interface for WLAN

NOTE

Terminal Program Settings

The instructions below describe how to connect to the transmitter 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

Port.

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Opening a Serial/USB Connection

1. Power up the transmitter 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 56 below) are used by the Service Port of the transmitter.

0810-070

Figure 56 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 (LAN/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 57 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
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 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 18 Measurement Commands

Table 19 Formatting Commands

warming in connection with SEND and R

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Command

Description

DIR

Lists trend log files

PLAY [0 ... 24] [START END]

Output recorded data file. Start and end

yyyy-mm-dd hh:mm:ss

DSEL

Select logged (and displayed) 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

AØ1

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 20 Data Recording Commands

times can only be specified if the data
logger module is installed. The times must
be given in the following format:

Table 21 Purge Commands

Table 22 Autocalibration Commands

Table 23 Calibration and Adjustment Commands

Table 24 Setting and Testing the Analog Outputs

Table 25 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

Display the output date/set date whe n
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

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)

MOL/MOLI

View/set mole weight parameter

Table 26 Other Commands

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Chapter 4 _________________________________________________________________ Operation

Getting Measurement Message from Serial Line

Starting Continuous Out put t ing

R

Enter the R command to start the continuous output of measurements.
Example:

>r
Tdf=-20.6 'C H2O= 958 ppmV x= 0.6 g/kg

>r
Tdf=-20.7 'C H2O= 958 ppmV T= 23.8 'C RH= 3.3 %RH
>

If a value is too long to fit to the allocated space in the output, or if there
is an error in outputting the quantity, the value is displayed with stars '*'.

You can change the format of the output with the following commands:

- Outputting interval can be changed with the INTV command.

- Output message format can be changed with the FORM command.

Stopping Continuous Outputt ing

S

Use the S command to end the RUN mode. After this command all other
commands can be used. You can also press the Esc button or reset the
transmitter to stop the outputting.

See command SMODE to change the default (power-up) operation
mode.

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Outputting Reading Once

Use the SEND command to output the reading once in STOP mode. The
output format depends on which parameters the transmitter can output.

SEND<cr>
Examples:

>send
Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg

>send
Tdf= -5.9 'C Td= -6.6 'C Tdfa= -5.9 'C Tda= -6.6 'C H2O=
3696 ppmV x= 2.3 g/kg RH= 13.9 %RH a= 2.7 g/m3 aNTP=

3.0 g/m3 T= 22.2 'C dT= 28.1 'C

Assign an Alias for the SEND Command

Use the SCOM command to assign a new command that works like the
SEND command. The standard SEND command of the transmitter will

always function normally whatever the SCOM definition may be.
Command names are case-insensitive.

SCOM<cr>
Example (assigning the command MEASURE as an alias for the SEND

command):

>scom
Send command : ? measure
>measure
Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg

>
You can remove the SCOM definition by pressing Esc when entering the

command name:

>scom
Send command : measure ? <esc>

>

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Chapter 4 _________________________________________________________________ Operation

The total execution time of the
of the serial port connection. At slow speeds, i
amount of time for devices with large address number to respond. The
delay will be the same even if there are no other devices at all.

where

aa = Address of the transmitter (0 ... 255)

Outputting Reading Once Fr om All Trans m it t e rs

Use the DSEND command to output the reading once from all connected
transmitters that are in STOP or POLL modes. In order to avoid data
collisions, the transmitters will send their response after a suitable delay.
The response includes the transmitters’s address, followed by their
measurement message.

NOTE

DSEND<cr>
Example (transmitters with addresses 3 and 25 responding):

>dsend
3 Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg
25 Tdf= -1.1 'C H2O= 5549 ppmV x= 3.5 g/kg
>

DSEND command depends on the bit rate

t will take a considerable

Communicating with a Transmitter in POLL Mode

OPEN

When all transmitters on the RS-485 bus are in POLL mode the OPEN
command sets one transmitter temporarily to STOP mode so that other
commands can be entered.

OPEN [aa]<cr>

CLOSE

The CLOSE command switches the transmitter back to the POLL mode.
Example:

>OPEN 2 (opens the line to transmitter 2, other
transmitters stay in POLL mode)

>CRH (for example, calibration performed)
...
>CLOSE (line closed)

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User's Guide _______________________________________________________________________

where

x = ON or OFF

where

x = ON or OFF (default)

Formatting Serial Line Message

NOTE

Instead of using the FTIME, FDATE and FST commands described in
this section, you can use the FORM command with modifiers TIME,
DATE, and STAT. See section FORM on page 98.

FTIME and FDATE

FTIME and FDATE commands will enable/disable output of time and
date to the serial line. To add time to R and SEND outputs enter:

FTIME [x]<cr>
To add date to R and SEND outputs enter:
FDATE [x]<cr>

Example:

>send
RH= 16.2 %RH T= 22.0 'C
>ftime on
Form. time : ON
>send
00:03:56 RH= 16.2 %RH T= 22.0 'C
>fdate on
Form. date : ON
>send
2000-01-01 00:04:08 RH= 16.2 %RH T= 22.0 'C
>

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FST

Use the FST command to include the status of purge, sensor warming
and AutoCal in output from the SEND and R commands.

FST [x]<cr>

Chapter 4 _________________________________________________________________ Operation

where the state of the probe is indicated by the following letters
and

w...xxx

=

Sensor warming

where xxx

=

Sensor heat power
(0 when not warming)

H...xxx

=

Purge

where xxx

=

Sensor temperature (ºC)

S...xxx

=

Sensor cooling
after purge

where xxx

=

Sensor temperature (ºC)
A...xxx

=

AutoCal

where xxx

=

Sensor temperature (ºC)

Only the
an output quantity.

Example:

>fst on
Form. status : ON
>send
w 0 Tdf= 0.6 'C x= 4.0 g/kg SSR= 22.5 % Ts= 23.2
'C
>

values:

General Settings

NOTE

Changing Quantities and Units

To change quantities and units use serial commands or the optional
display/keypad. See Table 5 on page 20 for available quantities.

quantities selected when ordering the device can be selected as

Using Display/Keypad

Use display/keypad to select the display output quantities.

1. Open the Main Menu by pressing any of the ▲▼◄► arrow

buttons.

2. Press the ► arrow button to select Display.

3. Press ► arrow button to select Quantities.

4. Select the quantity by using the ▲▼ arrow buttons. Confirm the

selection by pressing SELECT. You can select 1 ... 4 display
quantities at a time.

5. Press EXIT to return to the basic display.
To select display units:

1. Open the Main Menu by pressing any of the ▲▼◄► arrow

buttons.

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Changing the units by using the
serial output units.

where

x = Formatter string

2. Press the ► arrow button to select Display.

3. Use the ▲▼arrow buttons to select Units. Confirm the selection
by pressing the right-hand arrow button.

4. Use the ▲▼ arrow buttons to select display units. Confirm the
selection by pressing CHANGE. The unit changes from metric to
non-metric or the other way round.

5. Press EXIT to return to the basic display.

NOTE

display/keypad has no effect on the

Using Serial Line

Use the serial line command FORM to change the format, and the
command UNIT to select metric or non-metric output units.

FORM

Use the serial line command FORM to change the format or select a
certain quantities for the output commands SEND and R.

FORM [x]<cr>

Formatter string consists of quantities and modifiers. If no formatter
string is entered, the command will display the currently active formatter
string. Note that the hash symbol "#" is shown as a backslash "\" when
viewing the current formatter string.

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When selecting the quantity, use the abbreviations of the quantities
presented in Table 5 on page 20 when issuing the command. The
modifiers are presented in Table 27 on page 99.

Chapter 4 _________________________________________________________________ Operation

Modifier

Description

x.y

Length modifier (number of digits and decimal places)

#t

Tabulator

#r

Carriage-return

#n

Line feed

""

String constant

#xxx

Special character, code "xxx" (decimal), for example #027
for ESC

U5

Unit field and length (length optional)

ADDR

Transmitter address [00...255]

ERR

Error flags for P, T, Ta, RH [0000 ... 1111], 0 = no error

STAT

Transmitter status in 7 character field, for example:

X 95.0 sensor heating active, temperature 95 ºC

SN

Transmitter serial number

TIME

Time [hh:mm:ss]

DATE

Date [yyyy-mm-dd]

OK

Pressure stability indicator, two characters [OK or " "]

CS2

Modulus-256 checksum of message sent so far, ASCII
encoded hexadecimal notation

CS4

Modulus-65536 checksum of message sent so far, ASCII
encoded hexadecimal notation

CSX

NMEA xor-checksum of message sent so far, ASCII
encoded hexadecimal notation

Table 27 FORM Command Modifiers

N 0 no heating
h 115 probe heating active, power 115/255
H 159.0 purge heating active, temperature 159 ºC
S 115.0 purge cooling active, temperature 115 ºC

Example:

>form "SSR=" 4.2 ssr U5 #t "Ts=" ts U3 #r #n
OK
>send
SSR= 22.51% Ts= 23.14'C

Command 'FORM /' will return the default output format. The default
output format depends on the device configuration.

>form /
OK
>send
Tdf= 0.5 'C x= 4.0 g/kg SSR= 22.4 % Ts= 23.1 'C

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where

x = Unit system to be used. Options are:
M (metric units)
N (non-metric units)

where

y = Unit to be used for H20. Options are:
PPMV (parts per million by
PPMW (parts per million by weight)

UNIT

Use the UNIT command to select metric or non-metric output units, and
change the unit for the H2O quantity:

UNIT [x]<cr>

UNIT H2O [y]<cr>

volume)

NOTE

This command changes both the serial output and display units to either
metric or non-metric units. When you want to output both metric and
non-metric units simultaneously on the display, select the display units
by using the display/keypad.

Examples:

>unit m
Output units : metric
>

>unit h2o ppmv
H2O units : ppmV
>

Use the MOL/MOLI command to view/set mole weight parameter that
will be used in calculating H2O ppmw.

Pressure Compensation Setting

The pressure has an effect on humidity calculations and accuracy.
Therefore, accurate calculations can be achieved only when the process
pressure is taken into consideration. If you are using mixing ratio as an
output quantity, it is recommended that you make the pressure
compensation setting.

Note that conversions from mmHg and inHg are defined at 0°C and for
mmH2O and inH2O at 4°C.

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