Vaisala HUMICAP HMT310 User manual

USER'S GUIDE
Vaisala HUMICAP® Humidity and
Temperature Transmitte
r
HMT310
M210619EN-C

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 2007
No part of this manual may be reproduced in any form or by any means, electronic or
mechanical (including photocopying), nor may its contents be communicated to a third
party without prior written permission of the copyright holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or Conditions of
Sale.

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Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................7
About This Manual...................................................................7
Contents of This Manual.......................................................7
Version Information...............................................................8
General Safety Considerations.............................................8
Feedback...............................................................................9
Product Related Safety Precautions......................................9
ESD Protection .........................................................................9
Recycling ................................................................................10
Regulatory Compliances.......................................................10
Electromagnetic Compatibility.............................................10
Emissions.......................................................................11
Immunity.........................................................................11
Trademarks.............................................................................11
Warranty..................................................................................12
CHAPTER 2
PRODUCT OVERVIEW................................................................................13
Introduction to HMT310.........................................................13
Components ...........................................................................14
Probe Options.........................................................................15
Output Quantities...................................................................16
CHAPTER 3
INSTALLATION............................................................................................17
Selecting Location .................................................................17
Mounting .................................................................................17
Mounting the Transmitter/ Removing the Transmitter Unit.17
Mounting the Probes...........................................................19
Beware of Temperature Differences..............................19
General Instructions for Probes with Cable ...................20
HMT313 for General Use...............................................22
HMT314 for Pressurized Spaces...................................22
HMT315 for High Temperatures....................................24
HMT317 for Demanding Processes...............................24
HMT318 for Pressurized Pipelines/Oils.........................25
Tightening the Clasp Nut ...............................................27
Connections............................................................................28
Cable Wiring........................................................................28
Screw Terminal Connector..................................................29

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CHAPTER 4
OPERATION.................................................................................................31
Power ON/OFF ........................................................................31
Entering Serial Communication Parameters.......................31
List of Commands ..................................................................33
Measurement Output..............................................................35
R Start Continuous Outputting ............................................35
S Stop Continuous Outputting.............................................36
INTV Set Continuous Output Interval for RUN-Mode..........36
SEND Output Reading Once...............................................36
SMODE Set Serial Interface Mode......................................37
SERI Serial Line Settings....................................................37
ADDR Set Transmitter Address for Use in POLL-Mode .....38
OPEN Temporarily Open Transmitter from POLL-Mode to
Receive Serial Commands..................................................38
CLOSE Set Transmitter in POLL-Mode ..............................39
Output Formatting..................................................................39
FORM Serial Output Format ...............................................39
TIME, DATE Setting Time and Date ...................................41
FTIME, FDATE Add Time and Date to SEND and R Outputs41
UNIT Select Metric or Nonmetric Output Units ...................42
FST Output State of Chemical Purge or Sensor Heating
(with SEND and R Commands)...........................................43
Other Commands ...................................................................44
? Check Transmitter Settings..............................................44
ECHO Serial Bus Echo .......................................................44
FIND All Devices in POLL-Mode Send Their Addresses....45
HELP List Commands.........................................................45
PRES Set Ambient Pressure for Calculations.....................45
FILT Set Result Filtering......................................................47
RESET Reset Transmitter...................................................47
ERRS Display Error Messages...........................................47
Setting, Scaling and Testing Analog Outputs.....................48
AMODE Set Analog Outputs (0/4 ... 20 mA).......................48
ASEL Select Parameter for Analog Outputs.......................48
ASCL Scale Analog Outputs...............................................50
ITEST Test Analog Outputs ................................................50
AQTEST Test Analog Outputs for Desired Readings.........51
AERR Set Error Outputs .....................................................51
Chemical Purge (Optional) ....................................................52
General................................................................................52
Automatic/Manual Chemical Purge.....................................53
Automatic Chemical Purge Settings ....................................53
PUR Turn ON/OFF Automatic Chemical Purge..................53
PUR Set Chemical Purge Interval.......................................54
PURR Chemical Purge in Powerup.....................................54
Chemical Purge Activated Manually.....................................55
Starting Manual Chemical Purge.........................................55
Sensor Heating .......................................................................56
General................................................................................56
Setting Humidity Sensor Heating..........................................56
Sensor Heating ON/OFF.....................................................56

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Setting Heating Parameters................................................57
CHAPTER 5
MEASURING AT OVERPRESSURE...........................................................58
Pressure Regulator Recommended.....................................58
CHAPTER 6
MAINTENANCE ...........................................................................................60
Periodic Maintenance ............................................................60
Calibration Interval..............................................................60
Replacing Consumables........................................................60
Filter Change.......................................................................60
Sensor Change...................................................................61
Parts List for Consumables.................................................61
Technical Support..................................................................62
Return Instructions................................................................62
Vaisala Service Centers.........................................................63
CHAPTER 7
CALIBRATION AND ADJUSTMENT...........................................................64
Calibration and Adjustment Commands..............................64
LI Revert Factory Calibration ..............................................64
FCRH Relative Humidity Calibration after Sensor Change 65
CTEXT Set Calibration Information Text.............................65
CDATE Set Calibration Date...............................................66
ACAL Analog Output Calibration ........................................66
Relative Humidity Calibration and Adjustment (in Two
Points) .....................................................................................67
Low End Adjustment...........................................................68
High End Adjustment ..........................................................68
Temperature Calibration and Adjustment (in One Point)...69
CHAPTER 8
TECHNICAL DATA......................................................................................72
Specifications.........................................................................72
Options and Accessories......................................................75
Dimensions in mm (inches) ..................................................76
Transmitter Enclosure and Mounting Plates.......................76
Probes.................................................................................77
HMT311 .........................................................................77
HMT313 .........................................................................77
HMT314 .........................................................................78
HMT315 .........................................................................78
HMT317 .........................................................................79
HMT318 .........................................................................79
APPENDIX A
PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES...........80

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Duct Installation Kits (for HMT313/317/315).........................80
Pressure-Tight Swagelok Installation Kits (for HMT317) ...81
RH Probe Installation...........................................................81
Examples of Vapor-Tight Installations with Cable Gland...82
RH Probe Installations (for HMT313/317)...........................82
Ball Valve Installation kit for HMP318 ..................................83

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List of Figures
Figure 1 HMT310 Components..............................................................14
Figure 2 HMT310 Probes.......................................................................15
Figure 3 Mounting with Mounting Plates................................................18
Figure 4 Mounting Plate Dimensions .....................................................19
Figure 5 Measurement Error at 100 %RH when Difference Between
Ambient and Sensor Temperature is 1 °C...............................20
Figure 6 Horizontal Mounting of Probe...................................................20
Figure 7 Vertical Mounting of Probe.......................................................21
Figure 8 HMT314 Installation .................................................................23
Figure 9 Marking the Nut........................................................................23
Figure 10 HMT318 Probe Dimensions (in mm)........................................25
Figure 11 Sealing of Fitting Body into Process ........................................26
Figure 12 Tightening the Clasp Nut..........................................................27
Figure 13 8-Pole Connector .....................................................................28
Figure 14 Screw Terminal Connector.......................................................29
Figure 15 HyperTerminal Settings in Windows®2000 Environment........33
Figure 16 Decrease of Sensor Gain Due to Interfering Chemical and
Effect of Chemical Purge Process ...........................................53
Figure 17 Location of Adjustment Button .................................................67
Figure 18 Accuracy over Temperature Range.........................................73
Figure 19 Duct Installation Kit...................................................................80
Figure 20 Swagelok Installation Kit for RH Probe....................................81
Figure 21 Cable Installation with Cable Gland AGRO..............................82
Figure 22 Probe Installation with Cable Gland (not available from Vaisala)83
Figure 23 Installing the HMP318 Probe Through a Ball Valve Assembly 84

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List of Tables
Table 1 Manual Revisions.......................................................................8
Table 2 HMT310 Output Quantities.......................................................16
Table 3 HMT318 Probe Dimensions .....................................................26
Table 4 Entering Serial Parameters in Windows®2000 and Windows
NT®..........................................................................................32
Table 5 Quantity Abbreviations for FORM Command...........................40
Table 6 Modifiers...................................................................................40
Table 7 Output Quantities and their Metric and Nonmetric Units..........42
Table 8 Pressure Conversion Chart......................................................46
Table 9 Output Quantities and their Metric and Nonmetric Units..........49
Table 10 Available Spare Parts...............................................................61
Table 11 Relative Humidity Specifications ..............................................72
Table 12 Temperature Specifications (+ Operating Pressure Ranges) ..73
Table 13 Electronics Specifications.........................................................74
Table 14 Mechanics Specifications.........................................................74
Table 15 Options and Accessories..........................................................75

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 7
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 Humidity and Temperature Transmitter HMT310.
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.
- Chapter 3, Installation, provides you with information that is
intended to help you install the HMT310.
- Chapter 4, Operation, contains information that is needed to
operate Humidity Transmitter HMT310.
- Chapter 5, Measuring at Overpressure, contains important
information concerning the use of HMT310 in overpressure
conditions.
- Chapter 6, Maintenance, provides information that is needed in
basic maintenance of HMT310, and lists contact information for
technical support and Vaisala Service Centers.
- Chapter 7, Calibration and Adjustment, describes the relative
humidity and temperature adjustment procedures.

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- Chapter 8, Technical Data, provides the technical data of the
product.
- Appendix A, Probe Installation Kits and Installation Examples.
Version Information
Table 1 Manual Revisions
Manual Code Description
M210619EN-A June 2004 - First release
M210619EN-B September 2005
M210619EN-C September 2007 - Added HUMICAP® 180R and
HUMICAP® 180RC as sensor options
General Safety Considerations
Throughout the manual, important safety considerations are
highlighted as follows:
WARNING Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or
even death.
CAUTION Caution warns you of a potential hazard. If you do not read and
follow instructions carefully at this point, the product could be
damaged or important data could be lost.
NOTE Note highlights important information on using the product.