Vaisala HUMICAP HMP155 User manual

USER'S GUIDE
Vaisala HUMICAP
®
Humidity and Temperature Probe
HMP155
M210912EN-B

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 2009
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............................................................................5
About This Manual...................................................................5
Contents of This Manual.......................................................5
Version Information...............................................................6
Related Manuals...................................................................6
General Safety Considerations.............................................6
Feedback...............................................................................7
Product Related Safety Precautions......................................7
Regulatory Compliances.........................................................7
Electromagnetic Compatibility...............................................7
Recycling ..................................................................................8
Trademarks...............................................................................8
License Agreement..................................................................8
Warranty....................................................................................9
CHAPTER 2
PRODUCT OVERVIEW................................................................................11
Introduction to HMP155.........................................................11
Basic Features and Options................................................12
Structure of the HMP155.....................................................13
Additional Temperature Probe Option ................................14
Warmed Probe Option ........................................................15
CHAPTER 3
INSTALLATION............................................................................................17
Installation in Radiation Shields...........................................17
Installation in DTR13...........................................................18
Installation in DTR503.........................................................19
Installation in Stevenson Screen.........................................20
8-Pin Connector......................................................................21
Temporary RS-485 Connection Option...............................22
CHAPTER 4
OPERATION.................................................................................................23
Getting Started .......................................................................23
RS-485 Interface.....................................................................23
Serial Line Communication...................................................24
Installing the Driver for the USB Cable ...............................25
Terminal Application Settings..............................................26
List of Serial Commands.....................................................28
Getting Measurement Message from Serial Line................30
R.....................................................................................30

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S.....................................................................................30
SEND [ADDR]................................................................30
SDELAY .........................................................................31
Formatting Serial Line Message ...........................................31
Changing Quantities and Units............................................31
FORM.............................................................................31
UNIT [M/N] .....................................................................33
Pressure Compensation Setting..........................................33
Time.....................................................................................34
TIME [HH MM SS]..........................................................34
Serial Settings .....................................................................35
SERI [BAUD][PARITY][DATA][STOP] ...........................35
SMODE ..........................................................................35
INTV ...............................................................................36
Data Filtering.......................................................................37
FILT [0.1…1] ..................................................................37
?......................................................................................37
HELP..............................................................................39
ERRS..............................................................................40
VERS..............................................................................40
Resetting Transmitter Using Serial Line..............................40
RESET............................................................................40
Formatting Analog Output.....................................................41
Analog Output Settings .......................................................41
AMODE ..........................................................................41
ASEL ..............................................................................42
ATEST............................................................................43
AERR..............................................................................43
ADDR .............................................................................44
OPEN .............................................................................44
CLOSE ...........................................................................45
Sensor Functions ...................................................................45
Chemical Purge (Optional)..................................................45
Automatic Chemical Purge (Interval Purge)...................46
Manual Chemical Purge.................................................46
Chemical Purge in Power Up.........................................46
Starting and Configuring Chemical Purge...........................47
PUR................................................................................47
Sensor Heating....................................................................48
Setting Humidity Sensor Heating...................................48
XHEAT ......................................................................48
CHAPTER 5
MAINTENANCE............................................................................................51
Periodic Maintenance.............................................................51
Cleaning ..............................................................................51
Changing the Probe Filter ...................................................51
Changing the Sensor...........................................................52
Error States.............................................................................54
Technical Support ..................................................................55
Return Instructions ................................................................55
Vaisala Service Centers.........................................................56

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CHAPTER 6
CALIBRATION AND ADJUSTMENT...........................................................57
Push-Button Calibration........................................................59
Two-Point Humidity and Temperature Adjustment.............59
One-Point Humidity and Temperature Adjustment.............61
Passive Output Version Push-Button Calibration ...............62
Serial Line Calibration ...........................................................63
Two-Point Humidity Adjustment..........................................63
Two-Point Temperature Adjustment...................................64
Relative Humidity Adjustment after Sensor Change...........65
FCRH.............................................................................65
One-Point Humidity and Temperature Adjustment.............65
User Adjustment Commands................................................66
L ..........................................................................................66
LI .........................................................................................66
Feeding Adjustment Information..........................................67
CTEXT.................................................................................67
CDATE................................................................................67
Analog Output Adjustment....................................................67
ACAL [0/1]...........................................................................68
MI70 Check and Adjustment .................................................68
CHAPTER 7
TECHNICAL DATA......................................................................................71
Performance ...........................................................................71
Relative Humidity................................................................71
Temperature........................................................................72
Operating Environment .........................................................72
Calculated Variables..............................................................73
Accuracies of Calculated Variables .....................................73
Accuracy of Dewpoint Temperature °C...............................73
Accuracy of Mixing Ratio g/kg (Ambient Pressure 1013
mbar)...................................................................................73
Accuracy of Wet Bulb Temperature °C...............................74
Accuracy of Dewpoint Measurement ..................................74
Inputs and Outputs ................................................................75
Mechanics...............................................................................75
Options and Accessories......................................................76
Dimensions in mm (inches) ..................................................77
HMP155 Probe....................................................................77
Additional Temperature Probe............................................77
APPENDIX A
CALCULATION FORMULAS ......................................................................79

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List of Figures
Figure 1 HMP155 Probe.........................................................................13
Figure 2 HMP155 with Additional T-probe..............................................14
Figure 3 HMP155 with T-probe Installed in DTR13................................18
Figure 4 HMP155 Installed in DTR503...................................................19
Figure 5 HMP155 with T-Probe Installed in Stevenson Screen .............20
Figure 6 Wiring of HMP155 8-Pin Connector .........................................21
Figure 7 Pins Connected to Pt100 (passive output version) ..................22
Figure 8 PuTTY Terminal Application.....................................................27
Figure 9 Decrease of Sensor Gain.........................................................46
Figure 10 Changing the Sensor................................................................53
Figure 11 HMP155 Adjustment Buttons ...................................................58
Figure 12 Accuracy over Temperature Range: Voltage and RS-485.......72
Figure 13 Accuracy of Dewpoint Measurement........................................74
Figure 14 Probe Dimensions ....................................................................77
Figure 15 Additional Temperature Probe Dimensions..............................77
List of Tables
Table 1 Manual Revisions .......................................................................6
Table 2 Related Manuals.........................................................................6
Table 3 Quantities Measured by HMP155.............................................11
Table 4 Calculated Quantities Measured by HMP155 ..........................12
Table 5 Default Serial Communication Settings for the User Port ........24
Table 6 Measurement Commands........................................................28
Table 7 Formatting Commands.............................................................28
Table 8 Chemical Purge Commands (Optional)....................................28
Table 9 Calibration and Adjustment Commands...................................29
Table 10 Setting and Testing the Analog Outputs...................................29
Table 11 Other Commands .....................................................................29
Table 12 FORM Command Modifiers......................................................32
Table 13 Selection of Output Modes.......................................................36
Table 14 Error Messages ........................................................................54
Table 15 Calculated Variables.................................................................73
Table 16 Options and Accessories..........................................................76

Chapter 1 ________________________________________________________ General Information
VAISALA_____________________________________________________________________ 5
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 Probe
HMP155.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the
manual and the Humidity and Temperature Probe HMP155.
- Chapter 2, Product Overview, introduces the features, advantages,
and the product nomenclature of the Humidity and Temperature
Probe HMP155.
- Chapter 3, Installation, provides you with information that is
intended to help you install the Humidity and Temperature Probe
HMP155.
- Chapter 4, Operation, contains information that is needed to
operate the Humidity and Temperature Probe HMP155.
- Chapter 5, Maintenance, contains information that is needed in
basic maintenance of the Humidity and Temperature Probe
HMP155.
- Chapter 6, Calibration and Adjustment, provides information and
instructions concerning calibration and adjustment of the Humidity
and Temperature Probe HMP155.

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- Chapter 7, Technical Data, provides the technical data of the
Humidity and Temperature Probe HMP155.
- Appendix A, Calculation Formulas, presents the equations used in
the Humidity and Temperature Probe HMP155 to calculate values
of dewpoint, mixing ratio, absolute humidity and enthalpy in
normal pressure.
Version Information
Table 1 Manual Revisions
Manual Code Description
M210912EN-A June 2008 - First release.
M210912EN-B March 2009 - Removed the description for the
OVERICE command, updated the description of the
ASEL command.
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M210913EN-A Vaisala HUMICAP®Humidity and Temperature Probe
HMP155 Quick Reference Guide
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.

Chapter 1 ________________________________________________________ General Information
VAISALA_____________________________________________________________________ 7
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: [email protected]
Product Related Safety Precautions
Vaisala HUMICAP®Humidity and Temperature Probe HMP155
delivered to you has been tested for safety and approved as shipped
from the factory. Note the following precautions:
WARNING Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
CAUTION Do not modify the unit. Improper modification can damage the
product or lead to malfunction.
Regulatory Compliances
Vaisala HUMICAP®Humidity and Temperature Probe HMP155
complies with the following performance and environmental test
standards:
Electromagnetic Compatibility
Complies with EMC standard EN 61326-1, Electrical equipment for
measurement, control and laboratory use - EMC requirements for use
in industrial locations.

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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, Windows®XP, and
Windows®Vista 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.