USER'S GUIDE Calibration of Digital Transmitters with Vaisala HUMICAP® Humidity Indicator HMI41 Cables 19164ZZ and 25917ZZ M210777EN-B
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 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.
________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION............................................................................ 3 Safety......................................................................................... 3 Recycling .................................................................................. 4 Trademarks ............................................................................... 4 Warranty.........
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Chapter 1 ________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the product. Safety 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.
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.
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.
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Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature. Introduction HMI41 with Calibration Option Vaisala HUMICAP® Humidity Indicator HMI41 can be used as a field calibrator for various Vaisala humidity transmitters.
User's Guide ______________________________________________________________________ Calibration is quick and easy to perform. In calibration, HMI41 measures relative humidity with the reference probe and receives the RH information from the transmitter. HMI41 sends the measured or manually set reading to the transmitter which makes calculations and necessary corrections. The data is then stored in the transmitter memory.
Chapter 2 __________________________________________________________ Product Overview set The number on the first line of the display corresponds to the following HMI41 functions: 1 2 = = 3 = 4 = HMI41 as a humidity and temperature indicator HMI41 as a calibrator for HMD/W60/70 and HMP140 series analogue transmitters HMI41 as a calibrator for HMP230 and HMT100/HMT330 series digital transmitters HMI41 as a calibrator for the HMD/W20/30 and HMP130 series analogue transmitters To calibrate HMP230, HMT
User's Guide ______________________________________________________________________ These are also the factory settings of the HMP230 series. If the values on the HMI41 display do not correspond to those of the HMP230 series transmitter, change them with buttons ▲ and ▼ until they are correct, press ENTER and then ON/OFF.
Chapter 3 _______________________________________________________________ Calibration CHAPTER 3 CALIBRATION There are four ways for calibrating the HMP230, HMT100 and HMT330 series transmitters with HMI41. You can perform a onepoint offset or gain calibration using the HMI41 probe as a reference, or you can use HMI41 only as a terminal. Alternatively, you can perform a two-point calibration using the HMI41 probe as a reference, or you can use HMI41 only as a terminal.
User's Guide ______________________________________________________________________ HMI41 off and connect the calibration cable to the EXT connector at the bottom of HMI41 (Figure 1 below). Connect the other end of the cable to the connector X5 in the HMP230 transmitter (Figure 2 on page 13). The connector X5 is also used for mounting the RS485/422 serial port module or current loop module; if a module is mounted, it must first be removed (for further details, see the HMP230 series User's Guide).
Chapter 3 _______________________________________________________________ Calibration 0605-010 Figure 2 Calibration Connector X5 in Series HMP230 Transmitters 0605-011 Figure 3 Service Port in Series HMT100 Transmitters VAISALA _______________________________________________________________________ 13
User's Guide ______________________________________________________________________ 0605-012 Figure 4 Service Port in Series HMT330 Transmitters After having connected the cable, turn HMI41 on with the ON/OFF button and wait until the following text appears on the display: RH If you press the HOLD button, you will go on to two-point calibration mode, and if you press the MODE button, you will go on to gain calibration mode.
Chapter 3 _______________________________________________________________ Calibration One-Point Offset and Gain Calibrations Select the desired calibration with buttons ▲ and ▼. Select offset calibration if the humidity is < 65%RH and gain calibration if the humidity is > 65%RH: RH RH or Press ENTER to acknowledge the selection.
User's Guide ______________________________________________________________________ If you prefer, you can change the display to show the difference in readings. Press HOLD and a text similar to the following appears: RH % Numbers on the first line indicate how much the transmitter reading differs from that of the HMI41 reference probe. Numbers on the second line indicate the RH measured by the reference probe. You can return to the previous display by pressing HOLD again.
Chapter 3 _______________________________________________________________ Calibration HMI41 as a Terminal If the transmitter does not have a local keypad and it is calibrated against salt solutions, HMI41 can be used for visualizing and setting the transmitter's RH reading manually. RH % Numbers on the first line indicate the RH measured by the transmitter, and numbers on the second line indicate the RH measured by the HMI41 probe. Let the readings stabilize and press MODE.
User's Guide ______________________________________________________________________ In this case, perform the calibration again. Whether the calibration was successful or not, HMI41 always returns to show the selected calibration mode: RH RH or After having successfully completed the calibration, turn HMI41 off and disconnect the cable. Two-Point Calibration In two-point calibration mode, both offset and gain corrections are made. This calibration mode is more accurate than offset or gain calibrations.
Chapter 3 _______________________________________________________________ Calibration HMI41 as a Reference Meter RH Normally, the HMI41 reference is needed for calibration. Insert the HMI41 probe and the transmitter probe to the lower humidity. Within 1 ... 2 seconds the display changes automatically to show a text similar to the following: RH % Numbers on the first line indicate the RH measured by the transmitter, and numbers on the second line indicate the RH measured by the reference probe.
User's Guide ______________________________________________________________________ Insert both probes to the higher humidity. Within 1 ... 2 seconds, the display changes automatically to show a text similar to the following: RH % Numbers on the first line indicate the RH measured by the transmitter, and numbers on the second line indicate the RH measured by the reference probe. Let the readings stabilize. If you prefer, you can change the display to show the difference in the readings.
Chapter 3 _______________________________________________________________ Calibration In this case, perform the calibration again. Whether the calibration was successful or not, HMI41 always returns to show the selected calibration mode: RH After having successfully completed the calibration, turn HMI41 off and disconnect the cable.
User's Guide ______________________________________________________________________ Let the readings stabilize. Press MODE and a text similar to the following appears: RH % set Numbers on the first line are blinking, and numbers on the second line indicate the RH measured by the transmitter. You can now set the blinking reading to the correct value (for example to the equilibrium RH of the salt solution) with buttons ▲ and ▼.
Chapter 3 _______________________________________________________________ Calibration Numbers on the first line are blinking, and numbers on the second line indicate the RH measured by the transmitter. You can now set the blinking reading to the correct value (for example to the equilibrium RH of the salt solution) with buttons ▲ and ▼. Press ENTER to conclude the calibration. If the calibration has been successful, the following text appears: RH The data is now stored in the transmitter memory.
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Chapter 4 ___________________________________________________________ Troubleshooting CHAPTER 4 TROUBLESHOOTING In the following table you will find a summary of the few error messages that may appear during calibration: Table 1 Display: RH Troubleshooting Table What to Do: What is the Reason? This message may appear for example if Perform the calibration the difference between the reference again. humidities in two-point calibration is too small. Wait.
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Appendix A _______________________________________________Quick Reference to Calibration APPENDIX A 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 HMI41 as a calibrator. For those who take it into use for the first time, the User's Guide gives useful information that is not included in this quick reference guide.
User's Guide ______________________________________________________________________ Display: What to Do Check that the baud rate corresponds to that of the HMP230 transmitter (4.8 - 4800 baud), or HMT100/330 transmitters (19.2 - 19200 baud). Check that these line settings correspond to those of the HMP230 transmitter (E, 7, 1), or the HMT100/330 transmitters (N, 8, 1).
Appendix A _______________________________________________Quick Reference to Calibration Display: What to Do Press Calibration has been successful. ON/OFF (disconnect the cable) RH Calibration has not been successful. Perform the calibration again. RH Offset and Gain Calibrations with HMI41 as a Terminal Display: What to Do RH % Td °C°F T Pabs set min max °C°F Press HMI41 has been turned on. g/m Pa hyst hold Lo bat Hi Indication of the software version (if the version is 1.02 or more).
User's Guide ______________________________________________________________________ Display: What to Do Press Calibration has been successful. ON/OFF (disconnect the cable) RH Calibration has not been successful. Perform the calibration again. RH Two-Point Calibration with HMI41 as a Reference Meter Display: What to Do RH % Td °C°F T °C°F Pabs set min max Press HMI41 has been turned on. g/m Pa hyst hold Lo bat Hi Indication of the software version (if the version is 1.02 or more).
Appendix A _______________________________________________Quick Reference to Calibration RH Insert the HMI41 probe and the transmitter probe to the higher humidity. RH % RH % Let the readings stabilize. Conclude the calibration. Alternatively, you can change the display to show the difference in readings. ENTER to conclude or HOLD to have the difference on the display Let the readings stabilize. Conclude the calibration or return to the previous display.
User's Guide ______________________________________________________________________ RH Insert the transmitter probe to the lower humidity. RH % Let the readings stabilize. RH % set Set the blinking RH reading to the correct value (e.g. to the equilibrium RH of the salt solution). MODE V (number up) or W (number down) ENTER RH Insert the transmitter probe to the higher humidity. RH RH set % % Let the readings stabilize. MODE Set the blinking RH reading to the correct value (e.g.
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