Vaisala HUMICAP HMT330 Series User Manual

USER'S GUIDE

Vaisala HUMICAP®Humidity and

Temperature Transmitter Series

HMT330

M210566EN-D

PUBLISHED BY

Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland

Visit our Internet pages at http://www.vaisala.com/

© Vaisala 2006

No part of this manual may be reproduced in any form or by any means, electronic or
mechanical (including photocopying), nor may its contents be communicated to a third
party without prior written permission of the copyright holder.

The contents are subject to change without prior notice.

Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or Conditions of
Sale.

_________________________________________________________________________________

Table of Contents

CHAPTER 1

GENERAL INFORMATION ............................................................................ 9

About This Manual ................................................................... 9

Contents of This Manual ....................................................... 9

General Safety Considerations ........................................... 10

Feedback............................................................................. 10

Product Related Safety Precautions .................................... 11

ESD Protection .......................................................................11

Recycling ................................................................................ 12

Trademarks ............................................................................. 12

License Agreement ................................................................ 12

Warranty .................................................................................. 13

CHAPTER 2

PRODUCT OVERVIEW ................................................................................ 15

Introduction to HMT330 ......................................................... 15

Basic Features and Options................................................ 16

Probe Options ..................................................................... 19

Warmed Probe HMT337 ..................................................... 20

CHAPTER 3

INSTALLATION............................................................................................ 21

Mounting the Housing ........................................................... 21

Standard Mounting without Mounting Plate ........................21

Wall Mounting with Wall Mounting Kit ................................. 22

Mounting with DIN Rail Installation Kit ................................ 23

Pole Installation with Installation Kit for Pole or Pipeline .... 24

Mounting Rain Shield with Installation Kit ........................... 26

Panel Mounting Frame ........................................................ 27

Wiring ......................................................................................28

Cable Bushings ................................................................... 28

Grounding the Cables ......................................................... 29

Grounding the Transmitter Housing .................................... 30

Signal and Power Supply Wiring......................................... 31

Connections to 24 VAC Power Supply ............................... 32

Probe Mounting ...................................................................... 34

General Instructions for Probes with Cable ........................ 35

HMT333 for Ducts and Tight Spaces .................................. 37

HMT334 for High Pressure and Vacuum Applications........ 37

HMT335 for High Temperatures ......................................... 40

HMT337 for High Humidity Applications ............................. 40

Temperature Probe (Optional) ............................................ 40

HMT338 for Pressurized Pipelines...................................... 41

Tightening the Clasp Nut..................................................... 42

VAISALA _____________________________________________________________________ 1

User's Guide _______________________________________________________________________

Optional Modules....................................................................

44

Power Supply Module..........................................................44

Installation ......................................................................45

Warnings ........................................................................46

Galvanic Isolation for Output ...............................................48

Third Analog Output ............................................................48

Installation and Wiring .................................................... 49

Relays..................................................................................50

Installation and Wiring .................................................... 50

Selecting the Activation State of the Relay .................... 50

RS-422/485 Interface ..........................................................52

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

8-Pin Connector...................................................................55

CHAPTER 4

OPERATION .................................................................................................57

Getting Started........................................................................57

Display/Keypad (Optional) ..................................................... 57

Basic Display .......................................................................57

Graphic History .................................................................... 58

Menus and Navigation......................................................... 59

Language Setting ...........................................................60

Rounding Setting ............................................................61

Display Backlight Setting ................................................ 61

Display Contrast Setting ................................................. 61

Keypad Lock (Key guard) ............................................... 62

Menu PIN Lock ...............................................................62

Factory Settings .............................................................63

MI70 Link Program for Data Handling ..................................63

Serial Line Communication ...................................................63

User Port Connection ..........................................................64

Service Port Connection......................................................65

Terminal Program Settings.................................................. 66

List of Serial Commands .....................................................68

Getting Measurement Message from Serial Line................ 70

Stopping Continuous Outputting ....................................70

S ................................................................................70

Outputting Reading Once ............................................... 70

SEND ........................................................................70

SEND D.....................................................................71

Formatting Serial Line Message..........................................72

TIME and DATE .............................................................72

FTIME and FDATE .........................................................72

FST.................................................................................73

General Settings .....................................................................74

Changing Quantities and Units............................................ 74

Using Display/Keypad ....................................................74

Using Serial Line ............................................................75

FORM........................................................................75

UNIT ..........................................................................76

2 _________________________________________________________________ M210566EN-D

_________________________________________________________________________________

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

Using Display/Keypad .................................................... 77

Using Serial Line ............................................................ 77

PRES and XPRES .................................................... 77

User Port Serial Settings..................................................... 78

Using Display/Keypad .................................................... 78

Using Serial Line ............................................................ 79

SERI ............................................................................... 79

SMODE .......................................................................... 80

INTV ............................................................................... 80

ECHO............................................................................. 81

Data Filtering ....................................................................... 81

FILT................................................................................ 82

Device Information .............................................................. 82

? .....................................................................................83

HELP.............................................................................. 83

ERRS .............................................................................84

VERS ............................................................................. 84

Resetting Transmitter by Using Serial Line......................... 85

RESET ...........................................................................85

Locking Menu/Keypad by Using Serial Line ....................... 85

LOCK ............................................................................. 85

Data Recording....................................................................... 87

Selecting Data Recording Quantities .................................. 87

DSEL.............................................................................. 87

View Recorded Data ........................................................... 88

DIR ................................................................................. 88

PLAY .............................................................................. 89

Deleting the Recorded Files................................................ 90

DELETE/UNDELETE ..................................................... 90

Analog Output Settings ......................................................... 91

Changing Output Mode and Range .................................... 91

Analog Output Quantities .................................................... 93

AMODE/ASEL................................................................ 93

Analog Output Tests ........................................................... 95

ITEST ............................................................................. 95

Analog Output Fault Indication Setting ............................... 96

AERR .............................................................................96

Operation of Relays ............................................................... 97

Quantity for Relay Output.................................................... 97

Measurement-Based Relay Output Modes ......................... 97

Relay Setpoints .............................................................. 97

Hysteresis ...................................................................... 98

Relay Indicating Transmitter Error Status ........................... 98

Enabling/Disabling Relays ................................................ 100

Setting Relay Outputs ....................................................... 100

RSEL............................................................................ 101

Testing Operation of Relays.............................................. 103

RTEST ......................................................................... 103

77

VAISALA _____________________________________________________________________ 3

User's Guide _______________________________________________________________________

Operation of RS-485 Module ...............................................

104

Networking Commands .....................................................104

SERI .............................................................................104

ECHO ...........................................................................105

SMODE ........................................................................105

INTV .............................................................................106

ADDR ...........................................................................106

SEND............................................................................107

OPEN ...........................................................................107

CLOSE .........................................................................107

Sensor Functions .................................................................108

Chemical Purge (Optional) ................................................108

Automatic Chemical Purge (Interval Purge) ................. 109

Manual Chemical Purge ...............................................109

Chemical Purge in Power Up ....................................... 109

Starting and Configuring Chemical Purge .........................110

Using Buttons on Motherboard.....................................110

Using Display/Keypad (Optional) .................................110

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

PURGE....................................................................111

PUR.........................................................................112

Sensor Heating .................................................................. 113

Setting Humidity Sensor Heating .................................113

XHEAT ....................................................................113

CHAPTER 5

MAINTENANCE..........................................................................................115

Periodic Maintenance...........................................................115

Cleaning ............................................................................115

Changing the Probe Filter .................................................115

Changing the Sensor ...........................................................116

Error States .......................................................................117

CHAPTER 6

CALIBRATION AND ADJUSTMENT ......................................................... 119

Opening and Closing the Adjustment Mode......................119

Relative Humidity Adjustment............................................. 121

Using Push-Buttons........................................................... 121

Using Display/Keypad .......................................................122

Using Serial Line ...............................................................123

CRH..............................................................................123

Relative Humidity Adjustment after Sensor Change ........124

Using Display/Keypad .......................................................124

Using Serial Line ...............................................................124

FCRH............................................................................124

Temperature Adjustment .....................................................125

Using Display/Keypad .......................................................125

Using Serial Line ...............................................................125

CT.................................................................................126

CTA ..............................................................................126

4 _________________________________________________________________ M210566EN-D

_________________________________________________________________________________

Analog Output Adjustment..................................................

127

Using Display/Keypad ....................................................... 127

Using Serial Line ............................................................... 127

ACAL............................................................................ 127

Feeding Adjustment Information........................................ 128

Using Display/Keypad ....................................................... 128

Using Serial Line ............................................................... 128

CTEXT ......................................................................... 128

CDATE ......................................................................... 128

CHAPTER 7

TECHNICAL DATA ....................................................................................129

Specifications ....................................................................... 129

Performance...................................................................... 129

Relative Humidity .........................................................129

Temperature (+ Operating Pressure Ranges) ............. 130

Optional Temperature Probe ....................................... 130

Calculated Variables .................................................... 131

Accuracies of Calculated Variables .................................. 131

Accuracy of Dewpoint Temperature °C ....................... 131

Accuracy of Mixing Ratio g/kg (Ambient Pressure 1013

mbar)............................................................................

132

Accuracy of Wet Bulb Temperature °C ........................ 132

Accuracy of Absolute Humidity g/m³ ............................ 132

Dewpoint Temperature (HMT337 Warmed Probe

Option)...............................................................................

133

Operating Environment ................................................ 133

Inputs and Outputs....................................................... 134

Mechanics .................................................................... 134

Transmitter Weights ..................................................... 135

Technical Specifications of Optional Modules .................. 135

Power Supply Module .................................................. 135

Analog Output Module ................................................. 135

Relay Module ............................................................... 136

RS-485 Module ............................................................136

Options and Accessories ............................................. 136

Dimensions (in mm) ............................................................. 139

HMT331............................................................................. 140

HMT333............................................................................. 140

HMT334............................................................................. 141

HMT335............................................................................. 141

HMT337............................................................................. 142

HMT338............................................................................. 142

Temperature Probe ........................................................... 142

Technical Support ................................................................ 143

Return Instructions ..............................................................143

Vaisala Service Centers....................................................... 144

VAISALA _____________________________________________________________________ 5

User's Guide _______________________________________________________________________

APPENDIX A

PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES .........145

Duct Installation Kits (for HMT333/337/335)....................... 145

Duct Installation Kit for Temperature Probe (for HMT337)146
Pressure Tight Swagelok Installation Kits (for HMT337)..147

RH Probe Installation.........................................................147

Temperature Probe Installation .........................................147

Examples of Vapor Tight Installations with Cable Gland.148

RH-Probe Installations (for HMT333/337) .........................148

T- Probe Installations (HMT337) .......................................149

Example of Climate Chamber Installation .........................150

Example of Installation Through Roof ...............................151

Ball Valve Installation Kit for HMT338 ................................152

Meteorological Installation Kit (for HMT337) .....................154

APPENDIX B

CALCULATION FORMULAS.....................................................................155

List of Figures

Figure 1 Transmitter Body ......................................................................17

Figure 2 Inside of Open Transmitter .......................................................18

Figure 3 Probe Options...........................................................................19

Figure 4 Standard Mounting ...................................................................21

Figure 5 Mounting with Wall Mounting Kit ..............................................22

Figure 6 Dimensions of Plastic Mounting Plate ......................................22

Figure 7 Mounting with DIN Rail Installation Kit ..................................... 23

Figure 8 Vertical Pole.............................................................................. 24

Figure 9 Horizontal Pole .........................................................................24

Figure 10 Mounting with Metal Wall Mounting Plate ................................25

Figure 11 Dimensions of Metal Mounting Plate (mm) ..............................25

Figure 12 Mounting Rain Shield with Installation Kit ................................26

Figure 13 Panel Mounting with Frame ...................................................... 27

Figure 14 Panel Mounting Dimensions.....................................................27

Figure 15 Cable Bushings......................................................................... 28

Figure 16 Grounding the Screen of Electrical Cable ................................29

Figure 17 Screw Terminal Block on Motherboard ....................................31

Figure 18 Connections to 24 VAC Power Supply .....................................33

Figure 19 Measurement Error at 100 %RH ..............................................34

Figure 20 Horizontal Mounting of Sensor Head........................................ 35

Figure 21 Vertical Mounting of Sensor Head............................................36

Figure 22 HMT344 Probe .........................................................................38

Figure 23 Tightening the Nut ....................................................................38

Figure 24 Cleaning of Tightening Cone ....................................................39

Figure 25 HMT338 Probe .........................................................................41

Figure 26 Sealing of Fitting Body into Process......................................... 42

Figure 27 Tightening the Clasp Nut ..........................................................42

Figure 28 Power Supply Module...............................................................44

Figure 29 Galvanic Output Isolation Module............................................. 48

Figure 30 Third Analog Output ................................................................. 48

Figure 31 Relay Module............................................................................51

Figure 32 RS-485 Module.........................................................................52

6 _________________________________________________________________ M210566EN-D

_________________________________________________________________________________

Figure 33

Figure 34 Wiring of Optional 8-Pin Connector.......................................... 55

Figure 35 Basic Display ............................................................................ 58

Figure 36 Graphical Display ..................................................................... 58

Figure 37 Main Menus .............................................................................. 60

Figure 38 Service Port Connector and User Port Terminal on Mother

Figure 39 Connection Example Between PC Serial Port and User Port.. 64

Figure 40 Starting Hyper Terminal Connection ........................................ 66

Figure 41 Connecting to Hyper Terminal ................................................. 67

Figure 42 Hyper Terminal Serial Port Settings ......................................... 67

Figure 43 Device Information on Display ................................................ 82

Figure 44 Current/Voltage Switches of Output Modules ..........................91

Figure 45 Measurement-Based Relay Output Modes .............................. 97

Figure 46 FAULT/ONLINE STATUS Relay Output Modes ...................... 99

Figure 47 Relay Indicators on Display.................................................... 100

Figure 48 Decrease of Sensor Gain ....................................................... 108

Figure 49 Purge Buttons on Motherboard .............................................. 110

Figure 50 Chemical Purge Settings........................................................ 110

Figure 51 Performing Chemical Purge ................................................... 111

Figure 52 Changing the Sensor.............................................................. 116

Figure 53 Error Indicator and Error Message......................................... 117

Figure 54 Adjustment and Purge Buttons .............................................. 120

Figure 55 Adjustment Menu ................................................................... 120

Figure 56 Selecting Point 1 Reference Type.......................................... 122

Figure 57 Accuracy over Temperature Range ....................................... 130

Figure 58 Accuracy in Dewpoint Measurement...................................... 133

Figure 59 Transmitter Body Dimensions ................................................ 139

Figure 60 HMT331 Probe Dimensions ................................................... 140

Figure 61 HMT333 Probe Dimensions ................................................... 140

Figure 62 HMT334 Probe Dimensions ................................................... 141

Figure 63 HMT335 Probe Dimensions ................................................... 141

Figure 64 HMT337 Probe Dimensions ................................................... 142

Figure 65 HMT338 Probe Dimensions ................................................... 142

Figure 66 Optional Temperature Probe Dimensions.............................. 142

Figure 67 Duct Mounting Installation Kit................................................. 145

Figure 68 Duct Mounting Installation Kit for T-Probe ............................. 146

Figure 69 Swagelok Installation Kit for RH-probe .................................. 147

Figure 70 Swagelok Installation Kit for T-Probe ..................................... 147

Figure 71 Cable Installation with Cable Gland ....................................... 148

Figure 72 Probe Head Installation with Cable Gland ............................. 148

Figure 73 Vapor Tight Installation........................................................... 149

Figure 74 Wall Mounting Installation ...................................................... 149

Figure 75 Climate Chamber Installation (not Available from Vaisala) .... 150

Figure 76 Example of Installation through Roof ..................................... 151

Figure 77 Installing Sensor Head through Ball Valve Assembly ............ 152

Figure 78 Meteorological Installation Kit for Outdoor Installation........... 154

4-Wire RS-485 Bus .................................................................. 53

Board ........................................................................................

64

VAISALA _____________________________________________________________________ 7

User's Guide _______________________________________________________________________

List of Tables

Table 1 Quantities Measured by HMT330.............................................15

Table 2 Optional Quantities Measured by HMT330 ..............................16

Table 3 HMT338 Probe Dimensions .....................................................41

Table 4 Connecting the Twisted Pair Wires to the Screw Terminals ....52

Table 5 4-Wire (Switch 3: On) ...............................................................53

Table 6 2-Wire (Switch 3: Off) ...............................................................54

Table 7 Wiring of 8-Pin Connector ........................................................ 55

Table 8 Periods for Trend and Max/Min Calculations ...........................59

Table 9 Graph Information Messages in Cursor Mode .........................59

Table 10 Default Serial Communication Settings for the User Port ........64

Table 11 Fixed Communication Settings for Service Port .......................65

Table 12 FORM Command Modifiers ......................................................75

Table 13 Multiplication Factors ................................................................ 78

Table 14 Selection of Output Modes .......................................................80

Table 15 Filtering Levels..........................................................................81

Table 16 Error Messages ......................................................................118

Table 17 Indicator Led Functions ..........................................................120

Table 18 Calculated Variables (Typical Ranges) ..................................131

Table 19 Transmitter Weights (in kg/lb).................................................135

8 _________________________________________________________________ M210566EN-D

Chapter 1 _________________________________________________________ General Information

CHAPTER 1

GENERAL INFORMATION

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

About This Manual

This manual provides information for installing, operating, and
maintaining Vaisala HUMICAP® Humidity and Temperature
Transmitter Series HMT330.

Contents of This Manual

This manual consists of the following chapters:

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

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

­and the product nomenclature of HMT330.

-

Chapter 3, Installation, provides you with information that is
intended to help you install the product.

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

- Chapter 5, Maintenance, contains information that is needed in
basic maintenance of the product.

- Chapter 6, Calibration and Adjustment, provides information and
instructions concerning calibration and adjustment of HMT330.

- Chapter 7, Technical Data, provides the technical data of the
product.

VAISALA _____________________________________________________________________ 9

User's Guide _______________________________________________________________________

- Appendix A, Probe Installation Kits and Installation Examples,
presents the installation kits available for HMT330 and provides
some installation examples.

- Appendix B, Calculation Formulas, presents the equations used in
HMT330 to calculate values of dewpoint, mixing ratio, absolute
humidity and enthalpy in normal pressure.

General Safety Considerations

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

WARNING

CAUTION

NOTE

Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or
even death.

Caution warns you of a potential hazard. If you do not read and
follow instructions carefully at this point, the product could be
damaged or important data could be lost.

Note highlights important information on using the product.

Feedback

Vaisala Customer Documentation Team welcomes your comments
and suggestions on the quality and usefulness of this publication. If
you find errors or have other suggestions for improvement, please
indicate the chapter, section, and page number. You can send
comments to us by e-mail:

[e-mail]

10 ________________________________________________________________ M210566EN-D

Chapter 1 _________________________________________________________ General Information

Product Related Safety Precautions

The Vaisala HUMICAP® Humidity and Temperature Transmitter
Series HMT330 delivered to you has been tested for safety and
approved as shipped from the factory. Note the following precautions:

WARNING

CAUTION

Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.

Do not modify the unit. Improper modification can damage the
product or lead to malfunction.

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 ____________________________________________________________________ 11

User's Guide _______________________________________________________________________

Recycling

Recycle all applicable material.

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

Trademarks

HUMICAP® is a registered trademark of Vaisala. Microsoft®,
Windows®, Windows NT®, Windows® 2000 and Windows® XP are
registered trademarks of Microsoft Corporation in the United States
and/or other countries.

License Agreement

All rights to any software are held by Vaisala or third parties. The
customer is allowed to use the software only to the extent that is
provided by the applicable supply contract or Software License
Agreement.

12 ________________________________________________________________ M210566EN-D

Chapter 1 _________________________________________________________ General Information

Warranty

Vaisala hereby represents and warrants all Products
manufactured by Vaisala and sold hereunder to be
free from defects in workmanship or material
during a period of twelve (12) months from the date
of delivery save for products for which a special
warranty is given. If any Product proves however to
be defective in workmanship or material within the
period herein provided Vaisala undertakes to the
exclusion of any other remedy to repair or at its
own option replace the defective Product or part
thereof free of charge and otherwise on the same
conditions as for the original Product or part
without extension to original warranty time.
Defective parts replaced in accordance with this
clause shall be placed at the disposal of Vaisala.

Vaisala also warrants the quality of all repair and
service works performed by its employees to
products sold by it. In case the repair or service
works should appear inadequate or faulty and
should this cause malfunction or nonfunction of the
product to which the service was performed Vaisala
shall at its free option either repair or have repaired
or replace the product in question. The working
hours used by employees of Vaisala for such repair
or replacement shall be free of charge to the client.
This service warranty shall be valid for a period of
six (6) months from the date the service measures
were completed.

This warranty does not however apply when the
defect has been caused through

a) normal wear and tear or accident;

b) misuse or other unsuitable or unauthorized use

of the Product or negligence or error in storing,
maintaining or in handling the Product or any
equipment thereof;

c) wrong installation or assembly or failure to

service the Product or otherwise follow
Vaisala's service instructions including any
repairs or installation or assembly or service
made by unauthorized personnel not approved
by Vaisala or replacements with parts not
manufactured or supplied by Vaisala;

d) modifications or changes of the Product as well

as any adding to it without Vaisala's prior
authorization;

e) other factors depending on the Customer or a

third party.

Notwithstanding the aforesaid Vaisala's liability
under this clause shall not apply to any defects
arising out of materials, designs or instructions
provided by the Customer.

This warranty is however subject to following
conditions:

a) A substantiated written claim as to any alleged

defects shall have been received by Vaisala
within thirty (30) days after the defect or fault
became known or occurred, and

b) The allegedly defective Product or part shall,

should Vaisala so require, be sent to the works
of Vaisala or to such other place as Vaisala may
indicate in writing, freight and insurance
prepaid and properly packed and labelled,
unless Vaisala agrees to inspect and repair the
Product or replace it on site.

This warranty is expressly in lieu of and excludes
all other conditions, warranties and liabilities,
express or implied, whether under law, statute or
otherwise, including without limitation any implied
warranties of merchantability or fitness for a
particular purpose and all other obligations and
liabilities of Vaisala or its representatives with
respect to any defect or deficiency applicable to or
resulting directly or indirectly from the Products
supplied hereunder, which obligations and
liabilities are hereby expressly cancelled and
waived. Vaisala's liability shall under no
circumstances exceed the invoice price of any
Product for which a warranty claim is made, nor
shall Vaisala in any circumstances be liable for lost
profits or other consequential loss whether direct or
indirect or for special damages.

VAISALA ____________________________________________________________________ 13

User's Guide _______________________________________________________________________

This page intentionally left blank.

14 ___________________________________________________________________ M210566EN-D

Chapter 2 ___________________________________________________________ Product Overview

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features, advantages, and the product
nomenclature of HMT330.

Introduction to HMT330

Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT330 provides reliable humidity measurement in wide range of
applications. Analog outputs can be chosen between current and
voltage signals. Alternatively, digital outputs RS-232 (standard) or
RS-422/485 (optional) can be selected. The quantities measured and
calculated by HMT330 are presented in Table 1 below. The quantities
available as an option are presented in Table 2 below.

Table 1 Quantities Measured by HMT330

Quantity Abbreviati

Relative humidity (RH) RH %RH %RH
Temperature (T) T ºC ºF

on

Metric Unit Non Metric

Unit

VAISALA________________________________________________________________________ 15

User's Guide _______________________________________________________________________

Table 2 Optional Quantities Measured by HMT330

Quantity Abbreviati

on

Dewpoint / Frostpoint
Temperature (T
Dewpoint Temperature (Td) TD ºC ºF
Absolute humidity (a) A g/m3 gr/ft3
Mixing ratio (x) X g/kg gr/lb
Wetbulb temperature (Tw) TW ºC ºF
Humid air volume/ dry air
volume
(by volume or by weight) (H
Water vapor pressure (Pw) PW hPa lb/in2
Water vapor saturation
pressure (P
Enthalpy (h) H kJ/kg Btu/lb
Difference of T and T

)

d/f

)

ws

(∆T) DT ºC ºF

d/f

TDF ºC ºF

H2O ppmv/ppm

O)

2

PWS hPa lb/in

Metric Unit Non Metric

Unit

ppmv/ppmw

w

2

Basic Features and Options

- Several probes for various applications

- User friendly display

- Calculated output quantities available

- Different probe mounting kits, sensor protection options and probe
cable lengths

- Transmitter mounting kits for multiple installation purposes

- Chemical purge for applications where interfering chemicals in the
measuring environment pose a risk

- Warmed probe and sensor heating for high humidity conditions
(HMT337)

- Optional modules: isolated power supply, power supply module,
RS-422/485-module, additional analog output module and relay
module

- Additional temperature sensor (HMT337)

16 ___________________________________________________________________ M210566EN-D

Chapter 2 ___________________________________________________________ Product Overview

0503-001

Figure 1 Transmitter Body

The following The following numbers refer to Figure 1 above:
1 = Signal + powering cable gland

2 = Cable gland for optional module
3 = Cable gland for optional module
4 = Cover screw (4 pcs)
5 = Display with keypad (optional)
6 = Cover LED

VAISALA________________________________________________________________________ 17

User's Guide _______________________________________________________________________

0508-010

Figure 2 Inside of Open Transmitter

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/RS-422/485 module (optional)
5 = Grounding connector
6 = Power supply module (optional)
7 = Analog output relay module (optional)
8 = Humidity probe cable
9 = Temperature probe cable (optional)
10 = Output isolation module (optional)
11 = Adjustment buttons (chemical purge buttons) with indicator

led

18 ___________________________________________________________________ M210566EN-D

Chapter 2 ___________________________________________________________ Product Overview

Probe Options

0507-033

Figure 3 Probe Options

The following numbers refer to Figure 3 above:
1 = HMT331 for demanding wall-mounted applications

2 = HMT333 for ducts and tight spaces
3 = HMT334 for high pressure and vacuum applications

(up to 100 bars)

4 = HMT335 for high temperatures (up to 180 ºC, vapor tight)

*) Flange available as an option

5 = HMT337 for high humidity applications (optional warmed

and vapor tight probe head)

6 = HMT338 for pressurized pipelines (up to 40 bar)

Probe cable lengths are 2 m, 5 m and 10 m.

VAISALA________________________________________________________________________ 19

User's Guide _______________________________________________________________________

Warmed Probe HMT337

Temperature difference between the probe head and external
environment can cause a risk of condensation on the sensor. A wet
probe cannot observe the actual humidity in the ambient air. If the
condensed water is contaminated, the life span of the probe may
shorten and calibration may change.

HMT337 probe shall be used in applications where condensation can
occur due to high humidity and rapid humidity changes. The warmed
probe head is heated continuously so that its temperature is always
higher than in environment. This prevents condensation on the probe.
The power consumption of the warmed probe is slightly higher than
other probes.

20 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

CHAPTER 3

INSTALLATION

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

Mounting the Housing

The housing can be mounted either without the mounting plate or with
optional mounting plates.

Standard Mounting without Mounting Plate

Mount the housing by fastening the transmitter to the wall with 4
screws, for example M6 (not provided).

96

169

7
Ø

0508-019

Figure 4 Standard Mounting

VAISALA________________________________________________________________________ 21

User's Guide _______________________________________________________________________

Wall Mounting with Wall Mounting Kit

When mounting with wall mounting kit the mounting plate (Vaisala
order code 214829) can be installed directly on wall or onto a standard
wall box (also US junction box). When wiring through back wall,
remove the plastic plug from the wiring hole in the transmitter before
mounting.

0503-004

Figure 5 Mounting with Wall Mounting Kit

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 = The arched side up
4 = Fasten HMT330 to the mounting plate with 4 fixing screws

M3 (provided)

5 = Holes for wall/junction box mounting

0503-040

Figure 6 Dimensions of Plastic Mounting Plate

22 ___________________________________________________________________ M210566EN-D

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 HMT330 to the plastic mounting plate with 4 screws
provided for that purpose.

3. Press the transmitter onto the DIN rail so that the clip-fasteners
snap into the rail.

0503-002

Figure 7 Mounting with DIN Rail Installation Kit

VAISALA________________________________________________________________________ 23

User's Guide _______________________________________________________________________

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 upwards; see Figure 10 on page 25 below.

Figure 8 Vertical Pole

The following numbers refer to Figure 8 above:
1 = Fixing brackets (2 pcs) M8 (provided) for 30 ... 102 mm

poles.

2 = Mounting nuts M8 (4 pcs)

0503-007

Figure 9 Horizontal Pole

The following number refers to Figure 9 above:

0503-006

1 = Mounting nuts M8 (4 pcs)

24 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

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

0503-041

Figure 10 Mounting with Metal Wall Mounting Plate

The following numbers refer to Figure 10 above:
1 = Mount the plate to wall with 4 screws M8 (not provided)

2 = Fasten HMT330 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.

0508-023

Figure 11 Dimensions of Metal Mounting Plate (mm)

VAISALA________________________________________________________________________ 25

User's Guide _______________________________________________________________________

Mounting Rain Shield with Installation Kit

0503-008

Figure 12 Mounting Rain Shield with Installation Kit

The following numbers refer to Figure 12 above:
1 = Fasten the rain shield with 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 HMT330 to the mounting plate with 4 fixing screws

(provided).

26 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

Panel Mounting Frame

A panel mounting frame with adhesive tape is available as an option
(Vaisala order code: 216038). After the HMT330 has been installed
through the panel, a frame can be used to finish off the sawed surface
of the panel.

1. Mount the HMT330 to the panel.

2. The frame is attached to the panel with an adhesive tape
attached to the frame. Remove the paper protecting the tape
before attaching.

3. Attach the frame to the panel around the HMT330 to finish off
the panel mounting as illustrated, see Figure 13 below.

Figure 13 Panel Mounting with Frame

0503-025

Figure 14 Panel Mounting Dimensions

0503-024

VAISALA________________________________________________________________________ 27

User's Guide _______________________________________________________________________

Wiring

Cable Bushings

A single electrical cable with screen and three to ten wires is
recommended for power and analog/serial connections. The cable
diameter should be 8 ... 11 mm. The number of cable bushings
depends on the transmitter options. See the following
recommendations for the cable bushings:

NOTE

0503-010

Figure 15 Cable Bushings

The following numbers refer to Figure 15 above:
1 = Cable for signal/powering Ø8 ... 11 mm

2 = Cable for optional module Ø8 ... 11 mm
3 = Cable for optional power supply module Ø8 ... 11 mm

When there is high electric noise level (for example, near powerful
electric motor) in the operating environment it is recommended to use
shielded cable or take care that the signal cables are separated from
other cables.

28 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

Grounding the Cables

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

0504-049

Figure 16 Grounding the Screen of Electrical Cable

VAISALA________________________________________________________________________ 29

User's Guide _______________________________________________________________________

1. Cut back outer sheath to desired length.

2. Cut back screen braiding or screen foil to dimension X (see
figure 3).

3. Push the domed cap nut (item 1) and the seal insert with contact
socket of the gland (item 2+3) onto the cable as shown in the
diagram.

4. Bend over the screen braiding or screen foil by about 90º (item

4).

5. Push the seal insert with the contact socket of the gland (item
2+3) up to the screen braiding or screen foil.

6. Mount lower part (item 5) on the housing.

7. Push the seal with the contact socket of the gland and (item 2+3)
flush into the lower part (item 5).

8. Screw the domed cap nut (item 1) onto the lower part (item 5).

Grounding the Transmitter Housing

In case you need to ground the transmitter housing, the grounding
connector is found inside the housing, see Figure 2 on page 18. Note
anyhow that the probe head 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, HMT330 can be ordered with optional output
isolation module. This module prevents harmful grounding loops.

30 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

Signal and Power Supply Wiring

When connecting transmitter with 8-pin connector, see section 8-Pin
Connector on page 55. When wiring the power supply module, see
section Power Supply Module on page 44.

WARNING

0506-028

Figure 17 Screw Terminal Block on Motherboard

The following numbers refer to Figure 17 above:
1 = Power supply terminals 10 ... 35 VDC, 24 VAC

2 = User port (RS-232 terminals)
3 = Analog signal terminals

Make sure that you connect only de-energized wires.

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. For more information about the RS-232
connection refer to section Serial Line Communication on page

63.

VAISALA________________________________________________________________________ 31

User's Guide _______________________________________________________________________

4. When wiring RS-485 module, relay module or additional analog
output module, see section RS-422/485 Interface on page 52,
section Relays on page 50, and section Third Analog Output on
page 48.

5. Connect the power supply wires to the connectors: POWER
10 ... 35V+ 24V~ (+) and (-) terminals. If you are using 24 VAC
power supply, see the note below before connecting the supply
wires.

6. Turn on the power. The indicator led on the cover lit
continuously during normal operation.

7. Close the cover and replace the cover screws. The transmitter is
ready for use.

Connections to 24 VAC Power Supply

CAUTION

Separate floating supply for each transmitter is recommended (see
upper part of Figure 18 on page 33). If you have to connect several
transmitters or other instruments to one AC supply, the phase (~) must
always be connected to (+) connector of each transmitter (see lower
part of Figure 18).

24 VAC POWER SUPPLY USE

To prevent fire and/or damage, if either 24 VAC wire is grounded or
connected to a "-", "0", or "GND" terminal of any other device,

you must connect the same wire on the "-" terminal also on this
instrument.

32 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

0507-020

Figure 18 Connections to 24 VAC Power Supply

VAISALA________________________________________________________________________ 33

User's Guide _______________________________________________________________________

Probe Mounting

In humidity measurement and especially in calibration it is essential
that temperature of the probe and measuring environment is the same.
Even a small difference in temperature between the environment and
the probe causes an error. As the curve below shows, if the
temperature is +20 °C and the relative humidity 100 %RH, a
difference of ±1 °C between the environment and the probe causes an
error of ±6 %RH.

The graph below illustrates the measurement error at 100 %RH when
the difference between the ambient and sensor temperature is 1 °C.

Figure 19 Measurement Error at 100 %RH

0507-023

34 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

General Instructions for Probes with Cable

Mount the probes with a cable with the sensor head horizontally; this
way, any water condensing on the tube cannot flow onto the sensor.

0507-024

Figure 20 Horizontal Mounting of Sensor Head

The following numbers refer to Figure 20 above:
1 = To be sealed.

2 = To be insulated.
3 = Insulate the cable.
4 = Let the cable hang loosely. This prevents condensed water

running to the sensor along the cable.

VAISALA________________________________________________________________________ 35

User's Guide _______________________________________________________________________

When there is no alternative but to install the sensor head in the
process vertically, the point of entry must be carefully insulated. The
cable must also be allowed to hang loosely as this prevents any
condensed water from running onto the sensor head along the cable.

0507-022

NOTE

Figure 21 Vertical Mounting of Sensor Head

The following numbers refer to Figure 21 above:
1 = To be sealed.

2 = Insulate the cable.
3 = To be insulated.
4 = Let the cable hang loosely. This prevents condensed water

running to the sensor along the cable.

Please do not attach a heated probe (HMT337) to metal structures to
avoid condensation problems caused by heat conduction along the
metal.

If the process temperature is much higher than that of the
environment, the whole sensor head and preferably plenty of cable
must be inside the process. This prevents measuring inaccuracy
caused by heat conduction along the cable.

When mounted on the side of a duct or channel, the sensor head must
be inserted from the side of the duct. If this is not possible and the
sensor head must be inserted from the top, the point of entry must be
carefully insulated.

For Vaisala probe installation kits and some installation examples see
Appendix A on page 145.

36 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

HMT333 for Ducts and Tight Spaces

The HMT333 is a small size (ø = 12mm) general-purpose probe
suitable for ducts and channels with the installation kit available from
Vaisala.

The HMT333 provides for two measuring range options. The first
probe version is equipped with a flexible cable and can be used when
measuring in environments up to 80 ºC. The second version is suitable
for measuring in environments up to 120 ºC.

See Appendix A on page 145 for the following probe installation kits
for HMT333 and installation examples.

- Duct mounting kit

- Cable gland.

HMT334 for High Pressure and Vacuum Applications

The HMT334 probe is for the dewpoint measurements in pressurized
rooms and industrial processes. The probe is provided with a nut, a
fitting screw and a sealing washer. Keep the fitting screw and the nut
in place on the body of the sensor head during handling to prevent
damage to the highly polished surface of the probe. Follow the
instructions below to achieve a leak-tight assembly:

1. Unscrew the fitting screw from the nut and the sensor head.

2. Fasten the fitting screw to the chamber wall with a sealing

washer. Tighten the fitting screw into the threaded sleeve with a
torque spanner. The tightening torque is 150 ± 10 Nm (110 ± 7
ft-lbs).

3. Insert the body of the sensor head into the fitting screw and

screw the nut manually to the fitting screw until the connection
feels tight.

4. Mark both the fitting screw and the nut hex.

VAISALA________________________________________________________________________ 37

User's Guide _______________________________________________________________________

0506-029

Figure 22 HMT344 Probe

The following numbers refer to Figure 22 above:
1 = Tightening cone

2 = Nut
3 = Fitting screw, M22x1.5 or NPT 1/2"
4 = Sealing washer
5 = Sensor head; Ø12 mm.

5. Tighten the nut a further 30º (1/12) turn or if you have a torque
spanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).

0503-034

Figure 23 Tightening the Nut

NOTE

When re-tightening the nut after detachment the nut must be
tightened without increased effort.

6. Clean and grease the tightening cone of the fitting screw after
every tenth detachment. Change the sealing washer every time
the fitting screw is detached. Use high-vacuum grease (for
example Dow Corning) or similar grease.

38 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

0503-033

Figure 24 Cleaning of Tightening Cone

The following numbers refer to Figure 24 above:
1 = Fitting screw

2 = Sealing washer
3 = Tightening cone
4 = Clean cotton stick

CAUTION

NOTE

In pressurized processes it is essential to tighten the supporting nuts
and screws very carefully to prevent loosening of the probe by the
action of pressure.

When the HMT330 is installed in a process with a pressure differing
from normal atmospheric pressure, please enter the pressure value of
the process (in hPa or mbar) into the transmitter memory, see
command PRES and XPRES on page 77 or use display/keypad.

VAISALA________________________________________________________________________ 39

User's Guide _______________________________________________________________________

HMT335 for High Temperatures

HMT335 is installed similarly than the HMT333 probe but without the
supporting bar. Refer to Appendix A on page 145 for more
information on the duct installation kit for HMT335.

To avoid incorrect humidity readings, the temperature differences
between inside and outside of the duct must not be remarkable.

HMT337 for High Humidity Applications

The HMT337 is for environment where relative humidity is very high,
near saturation. The warmed probe head prevents the saturation of the
sensor. An additional temperature probe is also available.

See Appendix A on page 145 for a presentation of the following probe
installation kits for HMT337 with installation examples:

- Duct mounting kit

- Cable gland

- Pressure tight Swagelok connector

- Vaisala's Meteorological Installation kit

The installation kits are available for both humidity and temperature
probe.

Temperature Probe (Optional)

An external temperature probe for HMT337 is needed for the
measurement of the ambient temperature in case you have a
transmitter with a warmed probe. This allows you to measure other
humidity quantities apart from dewpoint and mixing ratio.

The temperature probe is connected always in factory.

40 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

HMT338 for Pressurized Pipelines

Due to the sliding fit the HMT338 is easy to install into and remove
from the pressurized process. The probe is especially suitable for the
measurements in pipelines. See section Ball Valve Installation Kit for
HMT338 on page 152.

0508-077

Figure 25 HMT338 Probe

The following numbers refer to Figure 25 above:
1 = Clasp nut, 24 mm hex nut

2 = Fitting body, 27 mm hex head

The following two fitting body options are available:

- Fitting Body ISO1/2 solid structure

- Fitting Body NPT1/2 solid structure

Table 3 HMT338 Probe Dimensions
Probe type Probe Dimension Adjustment Range

Standard 178 mm 120 mm
Optional 400 mm 340 mm

VAISALA________________________________________________________________________ 41

User's Guide _______________________________________________________________________

0507-025

Figure 26 Sealing of Fitting Body into Process

Tightening the Clasp Nut

1. Adjust the probe to a suitable depth according to the type of
installation.

2. Tighten the clasp nut first manually.

3. Mark the fitting screw and the clasp nut.

4. Tighten the nut a further 50 -60º (ca. 1/6 turn) with a wrench. If
you have suitable torque spanner, tighten the nut to max 45 ± 5
Nm (33 ± 4 ft-lbs).

0503-032

Figure 27 Tightening the Clasp Nut

The following numbers refer to Figure 27 above:
1 = Probe

2 = Clasp nut
3 = Pen
4 = Fitting screw

42 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

NOTE

CAUTION

CAUTION

NOTE

Take care not to over tighten the clasp nut to avoid difficulties when
opening it.

Take care not to damage the probe body. A damaged body makes the
probe head less tight and may prevent it from going through the clasp
nut.

In pressurized processes it is essential to tighten the supporting nuts
and screws very carefully to prevent loosening of the probe by the
action of pressure.

When installed in a process with a pressure differing from normal
atmospheric pressure, please enter the pressure value of the process
(in hPa or mbar) into the transmitter memory via the serial line (see
command PRES and XPRES on page 77) or by using
display/keypad.

VAISALA________________________________________________________________________ 43

User's Guide _______________________________________________________________________

Optional Modules

Power Supply Module

The AC (mains) power connection may be connected to the power
supply module only by an authorized electrician. A readily accessible
disconnect device shall be incorporated in the fixed wiring.

0506-027

Figure 28 Power Supply Module

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 POWER 10 ... 36V 24V

terminals of the mother board.
4 = +
5 = -

44 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

Installation

1. Disconnect the power and open the transmitter cover.

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 fasten the power module to the bottom of
the housing with four screws. See the position Figure 2 on page

18.

4. Connect the wires from the terminals of the power supply
module marked with + and - to the terminals POWER 10 ... 35
V 24V on the motherboard of the transmitter.

5. Connect the AC mains voltage wires to the power supply
module terminals marked with N and L.

6. Attach the grounding wire to the grounding terminal on the
right-hand side of the transmitter.

WARNING

WARNING

WARNING

7. Connect the power. The LED on the cover of the transmitter is
lit continuously during normal operation.

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.

VAISALA________________________________________________________________________ 45

User's Guide _______________________________________________________________________

Warnings

Questo prodotto é conforme alla Direttiva sul basso voltaggio (73/23 CEE).

- La conduttura elettrica puó essere collegata al modulo di alimentazione elettrica soltanto
da un elettricista autorizzato.

- Non staccare l´alimentazione elettrica dal trasmettitore quando é acceso.

- Non collegare la corrente elettrica al modulo di alimentazione elettrica se non é installato
nel trasmettitore HMT330.

- Collegare sempre il morsetto protettivo a terra!

Dette produkt er i overensstemmelse med direktivet om lavspænding (73/23
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 HMT330­senderen

- Forbind altid den beskyttende jordklemme!

Dit product voldoet aan de eisen van de richtlijn 73/23 EEG
(Laagspanningsrichtlijn).

- De stroom kan aan de stroomtoevoer module aangesloten worden alleen door een
bevoegde monteur.

- Het is niet toegestaan de stroomtoevoer module 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 HMT330-transmitter is gemonteerd.

- Altijd beschermend aardcontact aansluiten!

Este producto cumple con la directiva de bajo voltaje (72/23 EEC).

- La conexión de la alimentación principal al módulo de alimentación sólo puede realizarla
un electricista autorizado.

- No desenchufe el módulo de alimentación del transmisor cuando esté encendido.

- No conecte la alimentación principal al módulo de alimentación cuando no esté instalado
en el transmisor HMT330.

- Conecte siempre el terminal de protección de conexión a tierra.

See toode vastab madalpinge direktiivile (73/23 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 HMT330-tüüpi
saatjasse paigaldatud.

- Ühendage alati kaitsev maandusklemm!

46 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

Ez a termék megfelel a Kisfeszültségű villamos termékek irányelvnek
(73/23/EGK).

- A hálózati feszültséget csak feljogosított elektrotechnikus csatlakoztathatja a
tápegységmodulra.

- A bekapcsolt távadóról ne csatolja le a tápegységmodult.

- Ne csatlakoztassa a hálózati feszültséget a tápegységmodulhoz, ha az nincs beépítve a
HMT330 távadóba.

- Feltétlenül csatlakoztasson földelő védőkapcsot!

Šis produktas atitinka direktyvą dėl žemos įtampos prietaisų (73/23/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 HMT330 siųstuve, nejunkite jo į elektros
tinklą.

- Visada prijunkite prie apsauginės įžeminimo jungties!

Šis produkts atbilst Zemsprieguma direktīvai (73/23 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 HMT330 raidītājā

- Vienmēr pievienot aizsargājošu iezemētu terminālu !

Ten produkt spełnia wymogi Dyrektywy niskonapięciowej (73/23 EEC).

- Napięcie zasilające powinno zostać podłączone do modułu zasilacza tylko przez
wykwalifikowanego 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 HMT330.

- Zawsze należy podłączać zabezpieczający zacisk uziemiający!

Tento výrobek vyhovuje Směrnici pro nízké napětí (73/23 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
HMT330.

- Vždy zapojte ochrannou zemnící svorku!

VAISALA________________________________________________________________________ 47

User's Guide _______________________________________________________________________

Galvanic Isolation for Output

If galvanic isolation of the power supply line from the output signals
is needed, HMT330 can be ordered with optional output isolation
module. This module prevents harmful grounding loops.

NOTE

Output isolation module is not needed when using the power supply
module.

0506-030

Figure 29 Galvanic Output Isolation Module

The following number refers to Figure 29 above:
1 = Output isolation module

Third Analog Output

0503-030

Figure 30 Third Analog Output

The following numbers refer to Figure 29 above:
1 = Flat cable pins

2 = Screw terminals for signal line
3 = DIP switches to select the output mode and range

48 ___________________________________________________________________ M210566EN-D

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. To attach the module, open the transmitter cover and fasten the

analog output module to the bottom of the housing with four
screws. See the position from the picture on page 11.

3. Connect the flat cable between the analog output module and the

motherboard's pins 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 and 2 can be ON at a time.

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

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

93. For testing the analog output, see Section Analog Output
Tests on page 95. For fault indication setting, see section Analog
Output Fault Indication Setting on page 96.

VAISALA________________________________________________________________________ 49

User's Guide _______________________________________________________________________

Relays

HMT330 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 135.

Installation and Wiring

1. Disconnect the power and open the transmitter cover. In case the
relay-module is installed in the factory, continue with step 5.

2. To attach the module fasten the relay module to the bottom of
the housing with four screws. See the position in
page 18.

3. When the mains power is in use attach the grounding wire to the
grounding terminal.

Figure 2 on

4. Connect the flat cable between the relay module and the
MODULE 1 or MODULE 2 pins of the motherboard.

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, NC.

Selecting the Activation State of the Relay

The middlemost C terminal and either one of the terminals NO/NC
must be connected. The polarity can be freely selected.

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.
Connect the power and close the cover.

NOTE

50 ___________________________________________________________________ M210566EN-D

For instructions on how to operate the relay (for example, select
quantity for the relay output and set the relay setpoints) see section
Operation of Relays on page 97.

Chapter 3 ________________________________________________________________ Installation

WARNING

WARNING

0503-037

Figure 31 Relay Module

The following numbers refer to

Figure 31 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 opening the
transmitter you must switch off both the transmitter and the voltage
connected to the relay terminals.

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

VAISALA________________________________________________________________________ 51

User's Guide _______________________________________________________________________

RS-422/485 Interface

0503-029

Figure 32 RS-485 Module

The following numbers refer to Figure 32 above:
1 = Flat cable pins

2 = Selection switches
3 = Screw terminals for wiring

Installation and Wiring

1. Disconnect the power. In case the RS-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-485 module to the bottom of the housing with four screws.

3. Connect the flat cable between the RS-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 4 below:

Table 4 Connecting the Twisted Pair Wires to the Screw

Terminals

Screw terminal Data line

(2-wire RS-485)

1 (not connected) RxB
2 (not connected) RxA
3 Data pair shield Data pair shield
4 B TxB
5 A TxA

Data line
(4-wire RS-485/422)

52 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

6. If you use RS-485 (or RS-422) to connect just one HMT330 to a

master computer, enable the internal termination of HMT330 by
switching switches 1 and 2 ON. Make sure that the master's end
of the line is also terminated (by using master's internal
termination or with a separate terminator).

If you are connecting many transmitters to the same RS-485 bus,
make sure that switches 1 and 2 are OFF and terminate the bus
with separate terminators at both ends. This allows removing
any transmitter without blocking the bus operation.

NOTE

If you use the internal termination of the transmitter at the end of the
RS-485 bus (instead of using separate terminators) removing that
transmitter will block the bus operation.

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 HMT330
through terminals RxA and RxB and receives data from
HMT330 through terminals TxA and TxB.

Figure 33 4-Wire RS-485 Bus

Table 5 4-Wire (Switch 3: On)

RS-485 master Data HMT330

TxA → RxA
TxB → RxB
RxA ← TxA
RxB ← TxB

VAISALA________________________________________________________________________ 53

User's Guide _______________________________________________________________________

Table 6 2-Wire (Switch 3: Off)

RS-485 master Data HMT330

A ↔ A
B ↔ B

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.

54 ___________________________________________________________________ M210566EN-D

Chapter 3 ________________________________________________________________ Installation

8-Pin Connector

0503-026

Figure 34 Wiring of Optional 8-Pin Connector

Table 7 Wiring of 8-Pin Connector

PIN/Terminal Wire Serial Signal Analog Signal

1 White Data out TX A - ­2 Brown (serial GND) (serial GND) Signal GND (for

3 Green - - Ch 2+
4 Yellow - - Ch 1 +
5 Grey Supply - Supply - Supply ­6 Pink Supply + Supply + Supply +
7 Blue Data in RX B - -
8 Shield/Red Cable shield Cable shield Cable shield

RS-232 (EIA-232) RS-485 (EIA-485)

both channels)

VAISALA________________________________________________________________________ 55

User's Guide _______________________________________________________________________

This page intentionally left blank.

56 ___________________________________________________________________ M210566EN-D

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
using the optional display and turning the transmitter on the first time,
the language selection menu window opens. Select the language with

arrow buttons and press the SELECT button.

The pressure has an effect on humidity calculations and accuracy.
Therefore, accurate calculations can be achieved only when the
ambient pressure is taken into consideration. For instructions on how
to set the pressure, see section Pressure Compensation Setting on page

77.

Display/Keypad (Optional)

Basic Display

Display shows you the measurement values of the selected quantities
in the selected units. You can select 1 ... 3 quantities for the numerical
basic display (see section Changing Quantities and Units on page 74.)

VAISALA________________________________________________________________________ 57

User's Guide _______________________________________________________________________

NOTE

0507-002

Figure 35 Basic Display

The following numbers refer to Figure 35 above:
1 = The Info shortcut button, see section Device Information on

page 82 below

2 = The Graph shortcut button, see section Graphic History on

page 58 below

3 = Quantities selected for display

From any view, a four-second press on the right-hand function button
takes you directly to the basic display.

Graphic History

The graphical display shows the data trend of the selected quantities,
one at a time. The graph is updated automatically while measuring.
Use the following functions in the graphical display:

- Press the NEXT button to have the trend graph and max/min graph

in turns and browse through the quantities selected for display.

- Press the EXIT button to get back the basic display.

0507-001

Figure 36 Graphical Display

Trend graph: Shows you a curve of average values. Each value is a

calculated average over a period. See Table 8 on page 59 below.

58 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Max/min graph: Shows you the minimum and maximum values in a
form of curve. Each value is max/min over a time period. See Table 8
below.

Table 8 Periods for Trend and Max/Min Calculations

Observation Period Period for Trend/Max/Min

Calculations (Resolution)

20 minutes 10 seconds
3 hours 90 seconds
1 day 12 minutes
10 days 2 hours
2 months 12 hours
1 year 3 days

- Press the arrow buttons to zoom in and out the time in the graph

window.

- Press the arrow buttons to have the cursor mode where you can

observe individual measuring points. Press an arrow button to
move the cursor (vertical bar) along the time axis. The numerical
value at the cursor position is shown at the left upper corner. Time
from the present to the chosen moment is shown at the right upper
corner.

Table 9 Graph Information Messages in Cursor Mode

Message Interpretation

Power outage Power failure (marked also with dashed

vertical line)
No data Quantity has not been selected for the display
Device failure General device failure
T meas. failure Temperature measurement/sensor failure
RH meas. failure Humidity measurement/sensor failure
Adj. mode active Adjustment mode active (data recorded in the

adjustment mode is not displayed)

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 exact time difference between the present and the cursor
position is not exactly known.

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.

VAISALA________________________________________________________________________ 59

User's Guide _______________________________________________________________________

3. Open a submenu with button.

4. Press to return to the previous level.

5. Function button EXIT returns you back to the basic display.

0507-003

Figure 37 Main Menus

Language Setting

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. Select System (the lowest row), press button.

4. Select Language: ... (the third row marked with a flag icon),
press SELECT button (left-hand button).

5. Select the menu language with buttons and press SELECT
button (left-hand button).

6. Press EXIT to return to the basic display.

60 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

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 any 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.

Display Contrast Setting

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.

VAISALA________________________________________________________________________ 61

User's Guide _______________________________________________________________________

Keypad Lock (Key guard)

This function locks the keypad and prevents unintentional key presses.

1. Keep pressing the left-hand function button for 4 seconds to
lock the keypad (at any display).

2. To unlock the keypad, press the OPEN button for 4 seconds.

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 and graphical view 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.

NOTE

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.

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.

You can also disable the keypad completely with serial command
LOCK.

62 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

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. Press any of the arrow buttons to open the MAIN MENU.

2. Select System by pressing the ► arrow button.

3. Select Factory settings and press the REVERT button to

confirm your selection. Press the YES button to reset all settings
to the factory defaults.

See section General Settings on page 74 for a description of the other
menu options.

MI70 Link Program for Data Handling

The recorded data can be transferred to a PC by using MI70 Link
program. You can examine the recorded data easily in Windows
environment and transfer it further to a spreadsheet program (such as
Microsoft Excel) or virtually to any Windows program in numeric or
graphical format. MI70 Link program allows you also to monitor
transmitter readings directly with a PC (real-time window function).

MI70 Link program is available from Vaisala, see list of accessories in
section Options and Accessories on page 136.

1. Connect the connection cable between the serial port of your PC

and the Service Port of HMT330; see Figure 38 on page 64
below.

2. Check that the HMT330 is powered and start using the MI70

Link program.

Use a MI70 Link version 1.07, or a newer one, to be able to utilize all
the functions of HMT330.

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 and POLL
modes.

VAISALA________________________________________________________________________ 63

User's Guide _______________________________________________________________________

For temporary RS-232 connections use the service port. Service port
is always available with fixed serial settings.

0507-026

Figure 38 Service Port Connector and User Port Terminal on

Mother Board

The following numbers refer to Figure 38 above:
1 = Service port connector

2 = User port terminals

User Port Connection

Use suitable serial cable between the user port RxD, GND and TxD
screw terminals and the PC serial port, see Figure 39 on page 64
below.

Table 10 Default Serial Communication Settings for the User

Port

Parameter Value

Bauds 4800
Parity Even
Data bits 7
Stop bits 1
Flow control None

+

24 V~

–

RxD

GND

RS-232 10…36 V=

TxD

Ch1+

Ch1–

Ch2+

Ch2–

ANA LOG OUTPUTS USERPORT POWER

1 2 3 4 5

6 7 8 9

IOIOI

0506-033

Figure 39 Connection Example Between PC Serial Port and

User Port

64 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Connections to pins 4, 6, 7 and 8 on PC serial port are required only if
you are using software requiring hardware handshaking.

After power-up the transmitter (in STOP-mode) outputs the software
version and the command prompt.

HMT330/2.02
>

In RUN mode a measurement output starts immediately after power­up.

In POLL mode, the transmitter does not output anything after power­up (see section SMODE on page 105).

NOTE

User port cannot be used when RS-485 module is connected.

Service Port Connection

1. Connect the serial interface cable (optional accessory, order

code: 19446ZZ) between the serial port of your PC and the
service port connector on the motherboard, see Figure 38 on
page 64.

Table 11 Fixed Communication Settings for Service

Port

Parameter Value

Bauds 19200
Parity No
Data bits 8
Stop bits 1
Flow control None

2. Open a terminal program and set the communication settings

(see the following section for more detailed instructions).

3. Power-up the HMT330.

VAISALA________________________________________________________________________ 65

User's Guide _______________________________________________________________________

Terminal Program Settings

The following instructions show a connection example with
HyperTerminal program (included in the Microsoft Windows).

Follow the instructions below to open a HyperTerminal program:

1. Start HyperTerminal. To get help for starting HyperTerminal,
click "Start", select "Help" to open Windows help, and search
for "HyperTerminal".

0507-027

Figure 40 Starting Hyper Terminal Connection

2. In the "New Connection" window of the HyperTerminal, define
a name for HMT330 serial connection, for example "HMT330".
Click OK.

3. In the "Connect using" pull down menu, select the PC
communications port where the serial cable is connected. (If
your computer has only one COM port, it is called "COM1").
Click OK.

66 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

0507-028

Figure 41 Connecting to Hyper Terminal

4. Set the port settings in the "Properties" window to match the

settings of your HMT330 user port/service port. For HMT330,
"Flow control" must always be set to "None". Finally click OK
to start using the serial connection.

0503-015

Figure 42 Hyper Terminal Serial Port Settings

5. Select "File" Æ "Save" in the HyperTerminal main window to

save the serial port settings. To use the saved settings later, start
HyperTerminal, click cancel in the "New Connection" window,
and select "File" Æ "Open".

VAISALA________________________________________________________________________ 67

User's Guide _______________________________________________________________________

List of Serial Commands

The bold text in the brackets is the default setting. Commands are
entered by typing them on your computer and pressing the Enter key.

Measurement commands
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…99] Output the reading once
SEND D Outputting the reading with the

raw data

SMODE [STOP/RUN/POLL] Set the serial interface
SERI [baud p d s] User port settings (default: 4800 E

7 1) baud: 300…115200

ADDR [0…99] Set the transmitter address (for

POLL mode)

OPEN [0…99] Open temporarily connection to

the POLL-mode device

CLOSE Close the connection (back to

POLL mode)

Formatting commands
FORM Set the output format of SEND and

R commands

TIME Set the time
DATE Set the date
FTIME [ON/OFF] Add time to output to SEND and R

outputs

FDATE [ON/OFF] Add date to R and SEND outputs
FST [ON/OFF] Add the state of probe heating and

chemical purge in connection with
SEND and R commands

UNIT Select the metric or non-metric

output units

Data recording commands
DSEL Select data recording and display

quantities.

PLAY [0 ... 17] Output recorded data file
DIR Display recorded files
DELETE Delete the graph files
UNDELETE Recovers the deleted files

Chemical purge commands
PUR Set the automatic chemical purge
PURGE Start the manual chemical purge

68 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Calibration and adjustment commands
CRH Relative humidity calibration
CT Temperature calibration
CTA Additional temperature probe

calibration

FCRH Relative humidity calibration after

sensor change

CTEXT Give the text to calibration

information field

CDATE Set the calibration date
ACAL Analog output calibration

Setting and testing the analog outputs
AMODE View the analog output modes
ASEL Select the parameters for the

analog outputs

ITEST Test the analog outputs
AERR Change the analog error output

values

Setting and testing the relays
RSEL Set and view the relays
RTEST Test the relays

Other commands
? Output the information about the

device

?? Output the information about the

device in POLL-state

ECHO [ON/OFF] Turn the serial interface echo

ON/OFF

FIND All devices in POLL mode are sent

their addresses

HELP List the most common commands
PRES [hPa] Set the value for pressure

compensations

XPRES [hPa] Set the value for pressure

compensations, temporarily

ERRS List present transmitter errors
FILT Set the result filtering
VERS Display the software version

information

XHEAT Sensor heating
LOCK Lock the menu/disable keypad

VAISALA________________________________________________________________________ 69

User's Guide _______________________________________________________________________

Getting Measurement Message from Serial Line

Enter the R command to start output of measurements. Enter the S
command, press the Esc button or reset the transmitter to stop
outputting. See command SMODE to change the default (power-up)
operation mode.

Format the output by using the following commands:

- Outputting interval can be changed with the INTV command.

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

- Status of chemical purge and probe heating can be added with a

command FST.

- Date and time information can be added with commands FDATE

and FTIME

Examples:

>r
RH= 11.3 %RH T= 28.8 'C
>

>r
RH= 11.3 %RH T= 28.8 'C Tdf= -3.7 'C Td= -4.2 'C a= 3.2
g/m3 x= 2.8 g/kg T
w= 13.0 'C ppm= 4440 pw= 4.48 hPa pws= 39.53 hPa h=

36.1 kJ/kg dT= 32.5 'C

>

Stopping Continuous Outputting

S

Use the S command to end the RUN mode. After this command all
other commands can be used.

Outputting Reading Once

SEND

Use the SEND command to output the reading once in STOP mode:

The output format depends on which parameters the transmitter can
output.

70 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Examples:

RH= 98.4 %RH T= 31.1 'C

RH= 98.4 %RH T= 31.1 'C Td= 36.0 'C Tdf= 36.0 'C a= 42.4
g/m3 x= 38.8 g/kg Tw= 30.8 'C ppm= 62414 pw= 59.53
hPa pws= 60.52 hPa h= 130.7 kJ/kg

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 ‘*’.

Example:

RH=***.* %RH T= 31.0 'C

The output mode can be changed with the commands: FORM, FST,
FDATE, and TIME.

Outputting Reading with Raw Data

SEND D

Example:

>send d

24.1720 15.0399 -3.5743 189.2324 15.0709 15.0399

23.9765

Where the readings (from the left) are:

24.1720 = Temperature of the humidity probe ( ºC)

15.0399 = RH (%RH)

-3.5743 = Tdf (C)

189.2324 = Capacitance (pF)

15.0709 = RH raw: calculated from scaled capacitance (%RH)

15.0399 = Enhancement factor corrected RH (%RH)

23.9765 = Temperature of the additional temperature probe

(optional) (ºC)

VAISALA________________________________________________________________________ 71

User's Guide _______________________________________________________________________

Formatting Serial Line Message

TIME and DATE

To set time enter the TIME command. To set date enter the DATE
command.

TIME
DATE
These time and date settings are shown on the timestamps of PLAY

command. When you want to include time and date in the R and

SEND commands, use the FTIME and FDATE commands.

Example:

>TIME
Current time is 04:12:39
Enter new time (hh:mm:ss) ? 12:24:00
>DATE
Current date is 2000-01-01
Enter new date (yyyy-mm-dd) ? 2004-07-05
>

NOTE

Time and date are cleared to 2000-01-01 00:00:00 at reset or at power
failure.

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]
To add date to R and SEND outputs enter:

FDATE [x]
where
x = ON or OFF

72 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

N

Example:

>send
RH= 98.4 %RH T= 31.0 'C
>ftime on
Form. time : ON
>send
03:47:59 RH= 98.4 %RH T= 31.0 'C
>fdate on
Form. date : ON
>send
2004-07-05 03:48:03 RH= 98.4 %RH T= 31.0 'C
>

FST

To output the state of optional probe heating and chemical purge in
connection with SEND and R commands enter:

FST [x]

Where
x = ON or OFF (default)

Example:

>fst on
Form. status : ON
>send
N 0 RH= 40.1 %RH T= 24.0 'C Td= 9.7 'C Tdf= 9.7 'C
a= 8.7 g/m3 x= 7.5
g/kg Tw= 15.6 'C ppm= 11980 pw= 12.00 hPa pws= 29.91
hPa h= 43.2 kJ/kg
>purge
Purge started, press any key to abort.
>send
S 134 RH= 40.2 %RH T= 24.1 'C Td= 9.8 'C Tdf= 9.8 'C
a= 8.8 g/m3 x= 7.5
g/kg Tw= 15.7 'C ppm= 12084 pw= 12.10 hPa pws= 30.11
hPa h= 43.5 kJ/kg
>

For more information on chemical purge, see section Chemical Purge
(Optional) on page 108.

Where the state of the probe is indicated by the following letters and values:

... xxx = Normal operation where h xxx = Probe heat power
X ... xxx = Sensor heating where xxx = Sensor temperature (ºC)
H ... xxx = Chemical purge where xxx = Sensor temperature (ºC)
S ... xxx = Sensor cooling

where xxx = Sensor temperature (ºC)

after purge

VAISALA________________________________________________________________________ 73

User's Guide _______________________________________________________________________

General Settings

Changing Quantities and Units

To change quantities and units use serial commands or the optional
display/keypad. See Table 1 on page 15 for available quantities and
Table 2 on page 16 for optional quantities.

NOTE

Only the quantities selected when ordering the device can be selected
as a display output quantity.

Using Display/Keypad

Use display/keypad to select the display output quantities.

1. Press any of the arrow buttons to open the MAIN MENU.

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 ... 3 display
quantities at a time.

5. Press EXIT to return to the basic display.

To select display units:

1. Press any of the arrow buttons to open the MAIN MENU.

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

74 ___________________________________________________________________ M210566EN-D

Changing the display quantities/units (by using the display/keypad)
has no effect on the serial output data.

Chapter 4 _________________________________________________________________ Operation

Using Serial Line

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

where
x = Formatter string

Formatter string consists of quantities and modifiers.

When entering the command, use the abbreviations of the quantities.
For more information on quantities, see Table 1 and Table 2 on page

15.

The modifiers are presented in Table 12 below.

Table 12 FORM Command Modifiers

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
ADDR Transmitter address with two characters [00...99]
ERR Error flags for P, T, Ta, RH [0000 ... 1111], 0 = no error
STAT Transmitter status in 7 character field, for example:

N 0 no heating

h 115 probe heating active, power 115/255

H 159.0 purge heating active, temperature 159ºC

S 115.0 purge cooling active, temperature 115ºC

X 95.0 sensor heating active, temperature 95ºC
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

VAISALA________________________________________________________________________ 75

User's Guide _______________________________________________________________________

Modifier Description

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

A3H Pressure tendency [* or 0...8]

Example:

>form "RH=" 4.2 rh U5 #t "T=" t U3 #r #n
RH= 14.98%RH T= 74.68'F

>send
RH= 16.03%RH T= 74.66'F

>form "Tfrost=" tdf U3 #t "Temp=" t U3 #r#n
Tfrost= 36.0'C Temp= 31.0'C
>

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

NOTE

>form /
>send
RH= 98.4 %RH T= 31.1 'C
>

UNIT

Use the UNIT command to select metric or non-metric output units:

UNIT [x]

where
x = M or N

where
M = Metric units

N = Non-metric units

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 later by using the display/keypad.

76 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

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.

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

NOTE

Pressure compensation is intended to be used in normal air only.
When measuring in other gases, please contact Vaisala for further
information.

Using Display/Keypad

Use display/keypad to set the pressure compensation. To select the
pressure unit using display/keypad, see section Changing Quantities
and Units on page 74.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select Measuring and press the ►arrow button to confirm your

selection.

3. Select Pressure compensation and press the ►arrow button to
confirm you selection.

4. Press SET and enter the pressure value in the chosen unit by
using the arrow buttons.

5. Press OK and EXIT to return to the basic display.

Using Serial Line

PRES and XPRES

Command XPRES should be used if the value is changed frequently.
Its value is not retained at reset, and when set to 0; last value set with

PRES is used instead. Use the serial line and do the following:
PRES [aaaa.a]

XPRES [aaaa.a]

where
aaaa.a = Absolute process pressure (hPa)

VAISALA________________________________________________________________________ 77

User's Guide _______________________________________________________________________

Example:

>pres
Pressure : 1013.00 hPa ?
>pres 2000
Pressure : 2000.00 hPa
>

Table 13 Multiplication Factors

From To: hPa

mbar 1
Pa N/m2 0.01
mmHg torr 1.333224
inHg 33.86388
mmH2O 0.09806650
inH2O 2.490889
atm 1013.25
at 980.665
bar 1000
psia 1) 68.94757

1) psia = psi absolute.

Example:

29.9213 inHg = 29.9213 × 33.86388 = 1013.25 hPa

User Port Serial Settings

Using Display/Keypad

The communication settings for the user port can be changed via the
serial line or by using the optional display/keypad. The
communication settings for the service port are fixed and not
changeable.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select Interfaces and press the ►arrow button to confirm your

selection.

3. Select Serial interface and press the ►arrow button to confirm

your selection.

4. Select Bit rate/Serial format/Comm. mode by pressing the
CHANGE button. Use the ▲▼ arrow buttons to select and
press SELECT to confirm your selection.

5. If you selected RUN communication mode, select RUN interval
for and press SET to confirm your selection.

78 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

6. Use the arrow buttons to set the measuring interval and the unit.

Press OK to confirm your settings.

7. If you selected POLL communication mode, select POLL

address and press SET to confirm your selection.

8. Use the arrow buttons to set the transmitter address. Press OK to

confirm the setting.

9. Use the arrow buttons to select ECHO. Press ON to turn to it

on. Press OFF to turn it off.

10. Press EXIT to return to the basic display.
The new user port settings set using the display/keypad are effective

immediately.

Using Serial Line

SERI

Use the serial line command SERI [b p d s] to set communication
settings for the user port.

SERI [b p d s]
where
b = Bit rate (110, 150, 300, 600, 1200, 2400, 4800, 9600,19200,

38400, 57600, 115200)
p = Parity (n = none, e = even, o = odd)
d = Data bits (7 or 8)
s = Stop bits (1 or 2)

Example:

>SERI 600 N 8 1
600 N 8 1
>

You need to reset the transmitter to activate the new communication
settings set with command SERI.

The settings can be changed one parameter at a time or all parameters
at once:

>SERI O changing parity only
4800 O 7 1

>SERI 600 N 8 1
600 N 8 1
>

VAISALA________________________________________________________________________ 79

changing all parameters

User's Guide _______________________________________________________________________

SMODE

Use the command SMODE to set the user port start-up operating
mode.

SMODE [xxxx]

where
xxx = STOP, RUN or POLL

Table 14 Selection of Output Modes

Mode Output Available Commands

STOP
RUN Automatic output Only command S
POLL

Selected output mode will be activated after power outages.

Only with the SEND command

Only with the SEND [addr]
command

All (default mode)

Use with RS-485 buses, see
Operation of RS-485 Module on

104.

page

INTV

Use the command INTV to set the outputting interval for the RUN
mode.

INTV [xxx yyy]

where
xxx = Output interval (0 ... 255). 0: the fastest possible output rate.

yyy = Unit (s, min or h)

Example:

>INTV 10 min
Output intrv. : 10 min
>

80 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

ECHO

Use the command ECHO to set the user port echo. The command
either enables or disables echo of characters received.

ECHO [x]

where
x = ON (default) or

= OFF

NOTE

You can use the SERI, SMODE, INTV and ECHO commands to
change/view the user port settings even if you are currently connected
to the service port.

Data Filtering

The averaging data filter calculates an average over a certain period of
time. The lowest measurement noise is achieved with the extended
filtering. There are three filtering levels available.

Table 15 Filtering Levels

Setting Filtering level

OFF No filtering
ON (default) Standard = short filtering (approximately 15 s moving

average)

EXTENDED Extended filtering (default: approximately 1 min

average)

Use display/keypad to set the filtering level.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select Measuring by pressing the ► arrow button.

3. Select Filtering and press CHANGE to confirm your selection.

4. Select Off/Standard/Extended and press SELECT to confirm

your selection.

5. Press EXIT to return to the basic display.

VAISALA________________________________________________________________________ 81

User's Guide _______________________________________________________________________

FILT

Use the serial line command FILT [xxx] to set the filtering level.

FILT [xxx]

where
xxx = OFF, ON or EXT (default = ON)

Device Information

Use the display/keypad or the serial line to display the device
information.

Press the INFO button in the basic display to see the following
information:

- Current sensor operation (for example, chemical purge), if any, in
progress

- Present or past unacknowledged errors, if any

- Device information

- Adjustment information fed by the user

- Measuring settings

- Information on chemical purge settings (when applicable)

- Serial interface information

- Analog output information

- Relay output information (when applicable)

0507-030

Figure 43 Device Information on Display

Proceed in the information views by pressing the MORE button as
many times as you get the desired information. You can browse
through the information displays also with arrow buttons. Press OK to
return to the basic display.

82 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

?

Use the serial line command ? to check the current transmitter
configuration. Command ?? is similar but can also be used if the
transmitter is in POLL mode.

Example:

>?
HMT330 / 2.02
Serial number : Z4140007
Batch number : Z4020017
Adjust. date : 2005-06-20
Adjust. info : VAISALA/HEL
Date : 2000-02-12
Time : 22:58:25
Serial mode : STOP
Baud P D S : 4800 E 7 1
Output interval: 0 s
Address : 0
Echo : ON
Pressure : 1013.25 hPa
Filter : OFF
Ch1 output : 4...20mA
Ch2 output : 4...20mA
Ch1 RH low : 0.00 %RH
Ch1 RH high : 100.00 %RH
Ch2 T low : -40.00 'C
Ch2 T high : 60.00 'C
Module 1 : not installed
Module 2 : not installed
>

HELP

Use the command HELP to list the commands.

Example:

>help
? ACAL ADDR AERR ASCL
ASEL CDATE CLOSE CODE CRH
CT CTA CTEXT DATE DELETE
DIR DSEL DSEND ECHO ERRS
FCRH FDATE FILT FORM FST
FTIME HELP INTV ITEST MODS
OPEN PLAY PRES R RESET
SEND SERI SMODE TEST TIME
UNDELETE UNIT VERS XPRES
>

VAISALA________________________________________________________________________ 83

User's Guide _______________________________________________________________________

ERRS

Use the command ERRS to display transmitter error messages, see
Table 16 on page 118.

Example:

>ERRS
NO ERRORS
>

Example:

>ERRS
FAIL
Error: Temperature measurement malfunction
Error: Humidity sensor open circuit
>

VERS

Use the command VERS to display software version information.
Example:

>vers
HMT330 / 2.02
>

84 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Resetting Transmitter by Using Serial Line

RESET

This command resets the device. The user port switches to start-up
output mode selected with command SMODE.

Locking Menu/Keypad by Using Serial Line

LOCK

Use the LOCK command to turn on the menu lock with 4-digit PIN
code, for example 4444.

LOCK [x yyyy]

where
x = 1 (Menu locked)

yyyy = 4-digit PIN code

Example:

>lock 1 4444
Keyboard lock : 1 [4444]
>

VAISALA________________________________________________________________________ 85

User's Guide _______________________________________________________________________

Use the LOCK command to turn on the menu lock without PIN code
access possibility.

LOCK [x]

where
x = 1 (Menu locked)

Example:

>lock 1
Keyboard lock : 1
>

Use the LOCK command to disable the keypad completely.

LOCK [x]

where

NOTE

x = 2 (Keypad disabled)

Example:

>lock 2
Keyboard lock : 2
>

Open the locks with the serial command LOCK 0. You can open
the menu lock also by using the keypad, if a PIN code has been set.

86 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Data Recording

Data recording function is always on and collects data automatically
into the memory of the device. Recorded data do not disappear from
the memory when the power is switched off. Collected data can be
observed in a form of a graph in the graphical view of the display or it
can be listed out by using the serial line or MI70 Link program.

Selecting Data Recording Quantities

If the device is provided with the optional display, the recorded
quantities are always those selected for the display. Up to three
quantities can be recorded at a time. For instructions on how to select
the display quantities with the keypad, see section Changing
Quantities and Units on page 74.

DSEL

Use the serial line command DSEL to select the quantities to be
recorded if the transmitter is not equipped with display/keypad.

DSEL [xxx]

where
xxx = Data recording quantity. See Table 1 on page 15 and Table 2

on page 16 for the quantities.

Example:

>dsel rh t tdf
RH T Tdf
>

Enter the command without parameters and press ENTER to display
current recording parameters.

VAISALA________________________________________________________________________ 87

User's Guide _______________________________________________________________________

View Recorded Data

If the device is provided with the optional display, the graphical
display shows the data of the selected quantities, one at a time. See
section Graphic History on page 58 for details about graphical display.

You may also dump the logged data to the serial line in numeric form
with the following commands.

DIR

Use the serial line and enter the DIR command to check the available
files.

The device records six files (six observation periods) for each selected
quantity. Thus, total amount of the files depends on the amount of the
selected quantities being at minimum 6 and at maximum 18. See
Table 8 on page 59.

Select, for example, three quantities (RH, T, and Tdf). The last two
columns illustrate software information that is not essential for the
user.

Example:

>dir
0 RH latest 20 minutes 00-02-12 22:54:27 135 020A
1 RH latest 3 hours 00-02-12 19:54:27 135 025A
2 RH latest 1 day 00-02-11 20:16:57 135 040C
3 RH latest 10 days 00-02-01 17:16:57 135 0802
4 RH latest 2 months 99-12-07 11:16:57 135 080C
5 RH latest 1 year 99-01-03 23:16:57 135 1003
6 T latest 20 minutes 00-02-12 22:54:27 135 020A
7 T latest 3 hours 00-02-12 19:54:27 135 025A
8 T latest 1 day 00-02-11 20:16:57 135 040C
9 T latest 10 days 00-02-01 17:16:57 135 0802
10 T latest 2 months 99-12-07 11:16:57 135 080C
11 T latest 1 year 99-01-03 23:16:57 135 1003
12 Tdf latest 20 minutes 00-02-12 22:54:27 135 020A
13 Tdf latest 3 hours 00-02-12 19:54:27 135 025A
14 Tdf latest 1 day 00-02-11 20:16:57 135 040C
15 Tdf latest 10 days 00-02-01 17:16:57 135 0802
16 Tdf latest 2 months 99-12-07 11:16:57 135 080C
17 Tdf latest 1 year 99-01-03 23:16:57 135 1003
>

88 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

PLAY

Use the PLAY command to output the selected file to the serial line.
Data in the output is <TAB> limited. This is compatible with most
spreadsheet programs. Before giving the command, set the correct
date and time with TIME and DATE commands, if needed.

PLAY [x]

where
x = 0 ... 17

Example:

>play 2
RH latest 1 day 99-12-30 22:33:13
Date Time trend min max
yy-mm-dd hh:mm:ss %RH %RH %RH
99-12-30 22:33:13 19.16 18.99 19.33
99-12-30 22:45:13 19.30 19.09 19.55
99-12-30 22:57:13 20.01 19.28 21.17
99-12-30 23:09:13 21.21 20.98 21.44
99-12-30 23:21:13 19.57 17.72 21.11
99-12-30 23:33:13 19.09 18.62 19.84

NOTE

The <ESC> key can be used to interrupt the output listing.

The PLAY -1 command can be used to output all files.

Output of large amounts of recorded data can take a long time. If you
are using the user port, select the highest serial baud supported to
reduce the time required for output.

VAISALA________________________________________________________________________ 89

User's Guide _______________________________________________________________________

Deleting the Recorded Files

Use the keypad/display to delete the recorded files. Note that the
transmitter automatically overwrites the old data when the memory
gets full, so manual deletion of the recorded files is not necessary.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select System by pressing the ► arrow button.

3. Select Clear graph memories by pressing the CLEAR button.

Press the YES button to confirm the selection.

CAUTION

NOTE

This function clears all the data history from the memory, all graphs
included.

DELETE/UNDELETE

Use the serial line to delete or undelete data files.

Use the DELETE command to delete all data files. Use the
UNDELETE command to recover the deleted files.

The UNDELETE command will only recover the part of the deleted
data that has not been recorded over yet.

90 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Analog Output Settings

The analog outputs are set in the factory according to the order form.
In case you want to change the settings, follow these instructions. See
section Third Analog Output on page 48.

Changing Output Mode and Range

Both output channels have their own DIP switch module with 8
switches; see the position in Figure 2 on page 18 (DIP switches for
analog output settings).

1. Select the current/voltage output; switch ON either of the
switches, 1 or 2.

2. Select the range; switch ON one of the switches from 3 to 7.

0503-045

Figure 44 Current/Voltage Switches of Output Modules

The following numbers refer to Figure 44 above:
1 = Current/voltage selection output switches (from 1 to 2)

2 = Current/voltage range selection switches (from 3 to 7) in

analog output 1 and 2.

3 = Switches for service use only. Keep in OFF position always.

VAISALA________________________________________________________________________ 91

User's Guide _______________________________________________________________________

d

d

d

d

NOTE

Only one of the switches 1 or 2 must be ON at a time.

Only one of the switches 3 to 7 must be ON at a time.

Example: 0 ... 5 V voltage output selected for channel 1 and 4 ... 20
mA selected for channel 2.

OFF ON Selection

1
2

Voltage output selecte

3
4
5
6

0 ... 5 V selecte

7
8

1

Current output selecte

2
3
4

4 ... 20 mA selecte

5
6
7
8

NOTE

92 ___________________________________________________________________ M210566EN-D

If you have customized the error output setting (AERR), check that
the set error values are still valid after changing the output
mode/range, see section Analog Output Fault Indication Setting on
page 96.

Chapter 4 _________________________________________________________________ Operation

Analog Output Quantities

Use the display/keypad to change and scale the analog output
quantities.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select Interfaces by pressing the ► arrow button.

3. Select Analog outputs by pressing the ► arrow button.

4. Select Output 1/2/3 by pressing the ► arrow button.

5. Select Quantity by pressing the ▲▼ arrow buttons. Confirm
your selection by pressing CHANGE.

6. Select the quantity by using the arrow buttons. Press SELECT
to confirm your selection.

7. Select Scale, lower limit, by pressing the ▲▼arrow buttons.
Press SET to confirm your selection. Press OK to confirm your
setting.

8. Select the upper limit by pressing the ▲▼arrow buttons. Use
the arrow buttons to set the upper limit value. Press SET to
confirm your selection. Press OK to confirm your setting.

9. Press EXIT to return to the basic display.

AMODE/ASEL

Use the serial line to select and scale the analog output quantities.
Connect the transmitter to the PC. Open the terminal connection
between your PC and the transmitter.

1. Check the analog output modes with the AMODE command.

Example:

>amode
Ch1 output : 0...1V
Ch2 output : 0...1V
>

2. Select and scale the quantities for the analog outputs with the
command ASEL. Note that the optional quantities can be
selected only if they have been selected when ordering the
device.

VAISALA________________________________________________________________________ 93

User's Guide _______________________________________________________________________

ASEL [xxx yyy zzz]

where
xxx = Quantity of channel 1

yyy = Quantity of channel 2
zzz = Quantity of the optional analog output channel 3

Enter always all the quantities for all outputs. For quantities and their
abbreviations see Table 1 on page 15 and Table 2 on page 16.

Use the command ASEL [xxx yyy] as shown in the example below
when using a device with two analog outputs.

Example:

>asel rh t
Ch1 (RH ) low : 0.00 %RH ? 0
Ch1 (RH ) high : 100.00 %RH ? 100
Ch2 (T ) low : -40.00 'C ? -50
Ch2 (T ) high : 60.00 'C ? 80
>

94 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Analog Output Tests

Use the display/keypad for testing to test the operation of the analog
by forcing the outputs to known values. Measure then the outputs with
a current/voltage meter.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select System by pressing the ► arrow button.

3. Select Diagnostics by pressing the ► arrow button.

4. Select Analog output tests by pressing the ► arrow button.

5. Select one of the testing options Force 0%/50%/100% of scale.
Press TEST to confirm your selection. All outputs are tested
simultaneously. The actual output value depends on the selected
range.

6. Press OK to stop testing. Press EXIT to return to the basic
display.

ITEST

Use the serial line to test the operation of the analog outputs. Use the
command ITEST to force the analog outputs to entered values. The
set values remain valid until you enter the command ITEST without
parameters or RESET the transmitter.

ITEST [aa.aaa bb.bbb]

where

aa.aaa = Current or voltage value to be set for channel 1 (mA or V)
bb.bbb = Current or voltage value to be set for channel 2 (mA or V)

Example:

>itest 20 5
Ch1 (Td ) : * 20.000 mA H'672A
Ch2 (T ) : * 5.000 mA H'34F9
>itest
Ch1 (Td ) : -23.204 'C 16.238 mA H'FFFE
Ch2 (T ) : 22.889 'C 8.573 mA H'5950
>

VAISALA________________________________________________________________________ 95

User's Guide _______________________________________________________________________

Analog Output Fault Indication Setting

Factory default state for analog outputs during error condition is 0 V/
0 mA. Please be careful when selecting the new error value. The error
state of the transmitter should not cause unexpected problems in
process monitoring.

Use the display/keypad to set the analog output fault indication.

1. Press any of the arrow buttons to open the MAIN MENU.

2. Select Interfaces by pressing the ► arrow button.

3. Select Analog Outputs by pressing the ► arrow button.

4. Select Output 1/2/3 by pressing the ► arrow button.

5. Select Fault indication. Press SET to confirm your selection.

Enter the fault indication value by using the arrow buttons. Press
OK to confirm your setting. This value is outputted if a
transmitter error occurs.

NOTE

NOTE

6. Press EXIT to return to the basic display.

AERR

Use the serial line AERR command to change the error output.

AERR

Example:

>aerr
Ch1 error out : 0.000V ? 5.0
Ch2 error out : 0.000V ? 5.0
>

The error output value must be within a valid range of the output
mode.

The error output value is displayed only when there are minor
electrical faults such as humidity sensor damage. When there is a
severe device malfunction, the error output value is not necessarily
shown.

96 ___________________________________________________________________ M210566EN-D

Chapter 4 _________________________________________________________________ Operation

Operation of Relays

Quantity for Relay Output

A relay monitors the quantity chosen for the relay output. Any of the
quantities available can be chosen.

Measurement-Based Relay Output Modes

Relay Setpoints

When the measured value is in between the "above" and "below"
values, the relay is passive. When choosing lower value as "above"
value and higher value as "below" value, the relay is passive when the
measured value is not between the setpoints. You can also set only
one setpoint. See Figure 45 below for illustrative examples of the
different measurement-based relay output modes.

0610-076

Figure 45 Measurement-Based Relay Output Modes

VAISALA________________________________________________________________________ 97

User's Guide _______________________________________________________________________

Mode 4 is usually used if an alarm needs to be triggered when the
measured value exceeds a safe range. The relay is active when
measurement is in range, and is released if the value goes out of range
or the measurement fails.

NOTE

NOTE

If the measurement of the selected quantity fails or the transmitter
loses its power, the relay is released.

Hysteresis

Hysteresis function is to prevent the relay switching back and forth
when the measured value is near to the setpoint values.

Relay is activated when the measured value passes the exact value of
the setpoint. When returning and passing the setpoint again relay is
not released before the value reaches the setpoint increased/decreased
by the hysteresis value.

Hysteresis should be smaller than difference of the setpoints.

Example: When the 'active above' value is 60 %RH and the hysteresis
value is 5 %RH, relay activates when the relative humidity reaches 60
%RH. As the humidity decreases, relay releases at 55 %RH.

If both setpoints are specified and "above" setpoint is lower than
"below" setpoint, the hysteresis works in the opposite direction, that
is, relay is released when the measured value passes the exact value
of the setpoint.

Relay Indicating Transmitter Error Status

You can set a relay to follow the operation status of the device. By
selecting FAULT/ONLINE STATUS for output quantity a relay
changes state on the basis of the operation status as follows:

FAULT STATUS

Normal operation: relay active (C and NO outputs are closed)

Not measuring state (error state or power off): relay released (C and
NC outputs are closed)

98 ___________________________________________________________________ M210566EN-D