USER'S GUIDE Calibration of Series HMD/W20/30 and HMP130 Transmitters with Vaisala HUMICAP® Indicator HMI41 U220EN11
PUBLISHED BY Vaisala Oyj P.O. Box 26 FIN-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 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.
HMI41 Calibration Option Operating Manual 19165ZZ-U220en-1.1 Contents 1. INTRODUCTION ...................................................................................................................... 1 1.1 HMI41 with calibration option ...................................................................................... 1 1.2 Selecting the HMI41 calibrator function ...................................................................... 1 2. CALIBRATION ................................................
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HMI41 Calibration Option Operating Manual 19165ZZ-U220en-1.1 1. INTRODUCTION 1.1 HMI41 with calibration option The HMI41 can be used as a field calibrator for various Vaisala humidity transmitters.
HMI41 Calibration Option Operating Manual 19165ZZ-U220en-1.1 °C set If the basic settings of the HMI41 (display units, automatic power off function, display quantities and pressure) have to be changed, please refer to the HMI41 Operating Manual.
HMI41 Calibration Option Operating Manual 19165ZZ-U220en-1.1 2. CALIBRATION For a successful calibration, it is essential that the probe of the HMI41 and that of the transmitter are at the same temperature, and that the reference probe has been previously calibrated. Always allow enough time for the readings to stabilize. Note that the stabilization time depends on the ambient conditions and may vary from 10 minutes to a couple of hours. 2.
HMI41 Calibration Option Operating Manual 19165ZZ-U220en-1.1 test connector gain offset Figure 2.3 Calibration connector and potentiometers in the HMD 20/30UB/YB transmitters gain offset test connector Figure 2.4 2.
HMI41 Calibration Option Operating Manual 19165ZZ-U220en-1.1 • After having completed the calibration, press ON/OFF and disconnect the cable. If you prefer, you can change the HMI41 display to show the difference in the readings and then adjust the transmitter. To do this, press MODE when both readings are on the display and a text similar to the following is displayed: RH % Numbers on the first line indicate how much the RH measured by transmitter differs from that of the reference probe.
19165ZZ-U220en-1.1 HMI41 Calibration Option Appendix 1 APPENDIX 1: QUICK REFERENCE TO CALIBRATION It is recommended that this quick reference guide is used only as a checking list for those who already know how to operate the HMI41 as a calibrator. For those who take it into use for the first time, the Operating Manual gives useful information that is not included in this quick reference guide. 1.
HMI41 Calibration Option Appendix 1 2. 19165ZZ-U220en-1.1 Calibration After having connected the cable, turn the HMI41 on and follow the instructions of the table below: DISPLAY RH % Td °C°F T °C°F WHAT TO DO PRESS: The HMI41 has been turned on. Pabs g/m Pa setminmax hyst hold Lo batHi Indication of the software version (if the version is 1.02 or more) Indication of the battery voltage.
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