USER'S GUIDE Calibration of Series HMD/W60/70 and HMP140 Transmitters with Vaisala HUMICAP® Indicator HMI41 U218EN11
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 19116ZZ-U218en-1.1 Contents 1. INTRODUCTION ...................................................................................................................... 1 1.1 HMI41 with calibration option ...................................................................................... 1 1.2 Selecting the HMI41 calibrator function ...................................................................... 1 2. OUTPUT SCALE SELECTIONS.....................................
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HMI41 Calibration Option Operating Manual 19116ZZ-U218en-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 19116ZZ-U218en-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 19116ZZ-U218en-1.1 2. OUTPUT SCALE SELECTIONS 2.1 Standard transmitter settings In Table 2.1 you will find the standard settings of the HMD/W60, HMD/W70 and the HMP140 series transmitters. Transmitter Relative humidity scaling range Temperature scaling range HMP140 0...100 %RH -40...+60 °C HMD60 0...100 %RH -20...+80 °C HMD70 0...100 %RH -20...+80 °C HMW60 0...100 %RH -5...+55 °C 0...100 %RH HMW70 Table 2.1 -5...+55 °C Voltage output 0...1 V 0.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 Scale selection mode is entered when this text is on the display. 2.3 Scale selection modes The HMI41 has four scale selection modes: voltage output (U) and current output (I) selection modes are used for transmitters with standard settings. Customized voltage output (cU) and customized current output (cI) selection modes are meant for analogue transmitters with customized RH, T and/or output range settings.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 T °C T °C set Hi Numbers on the first line start to blink. They indicate the upper limit of the transmitter’s temperature range currently stored in the HMI41 memory. Text in the lower righthand corner is Hi. You can now set the upper limit with buttons ▲ (number up) or ▼ (number down) to correspond to that of the transmitter. Acknowledge the setting with ENTER and turn the HMI41 off with the ON/OFF button.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 T °C T °C set Lo Numbers on the second line are blinking. They indicate the lower limit of the transmitter’s temperature range currently stored in the HMI41 memory. Text in the lower righthand corner is Lo. You can now set the lower limit with buttons ▲ (number up) or ▼ (number down) to correspond to that of the transmitter. Acknowledge the setting with ENTER: T °C T °C set Hi Numbers on the first line start to blink.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 2.3.3.1 Humidity channel RH set Numbers on the display are blinking. They indicate the voltage range of the transmitter’s RH channel (jumper selectable) currently stored in the HMI41 memory. Please, consult Figures 2.3.1 - 2.3.2 when checking the transmitter’s jumper positions. RH output selections 0...1V 0...5 V 0...10 V Figure 2.3.1 Jumper selections of the HMD/W70 RH output selections 0...1V 0...5 V Figure 2.3.2 0...
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 RH set Hi Numbers on the first line start to blink. They indicate the upper limit of the transmitter’s voltage range currently stored in the HMI41 memory and the text in the lower righthand corner is Hi. You can now set the upper limit of the voltage range to correspond to that of the transmitter. Set the limit with buttons ▲ or ▼ and acknowledge the setting with ENTER.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 2.3.3.2 Temperature channel T set Numbers on the second line are blinking. They indicate the voltage range of the transmitter’s T channel (jumper selectable) currently stored in the HMI41 memory. Please, consult Figures 2.3.3 - 2.3.4 when checking the transmitter’s jumper positions. T output selections 0...1V 0...5 V 0...10 V Figure 2.3.3 Jumper selections for the HMD/W70 T output selections 0...1V 0...5 V 0...10 V Figure 2.3.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 T set Hi Numbers on the first line start to blink. They indicate the upper limit of the transmitter’s voltage range currently stored in the HMI41 memory. Text in the lower righthand corner is Hi. You can now set the upper limit with buttons ▲ or ▼ to correspond to that of the transmitter. Acknowledge the setting with ENTER. A text similar to the following is displayed: T °C T °C set Lo Numbers on the second line are blinking.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 Select the cI selection mode with buttons ▲ or ▼ and acknowledge the selection with ENTER. A text similar to the following is displayed: RH set 2.3.4.1 Humidity channel RH set Numbers on the second line are blinking. They indicate the current range of the the transmitter’s RH channel currently stored in the HMI41 memory. Select the range with buttons ▲ or ▼ to correspond to that of the transmitter. Acknowledge the selection with ENTER.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 lower righthand corner is Hi. You can now set the upper limit to correspond to that of the transmitter. Set the limit with buttons ▲ or ▼ and acknowledge the setting with ENTER. The HMI41 goes on to T channel settings and a text similar to the following is displayed: T set 2.3.4.2 Temperature channel T set Numbers on the second line are blinking.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 3. 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. 3.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 RH TEST X3 T TEST X4 T GAIN TEST CONNECTOR T OFFSET RH RH OFFSET GAIN RH OFFSET HMD70U/Y HMW60U/Y Figure 3.3 T GAIN T OFFSET RH GAIN Calibration connectors and potentiometers in the HMW60 and HMW70 transmitters Tgain Toffset Test connector for voltage outputs RHoffset Test connector for current outputs RHgain Current Module Figure 3.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 3.2 Humidity calibration When performing the humidity calibration of the HMD/W60 transmitters, make sure that the calibration cable is connected to the RH test connector (Figures 3.2 and 3.3). After having connected the cable, turn the HMI41 on with the ON/OFF button and wait until the following text appears on the display: RH T This message remains on the display for about 5 seconds.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 Numbers on the first line indicate how much the RH measured by the transmitter differs from that measured by the HMI41 reference probe. Numbers on the second line indicate the relative humidity measured by the reference probe. If you wish, you can now adjust the transmitter (by pressing HOLD again you will return to the previous RH calibration mode): • Wait until the readings have stabilized and adjust the calibration potentiometers (Figures 3.
HMI41 Calibration Option Operating Manual 19116ZZ-U218en-1.1 If you press the HOLD button in the first T calibration mode, you will go on to the second T calibration mode which is an alternative for the first one. A text similar to the following is displayed: T °C T °C Numbers on the first line indicate how much the temperature measured by the transmitter differs from that measured by the HMI41 reference probe. Numbers on the second line indicate the temperature measured by the reference probe.
HMI41 Calibration Option Appendix 1 19116ZZ-U218-1.1 APPENDIX 1: QUICK REFERENCE TO SCALE SELECTIONS AND 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. 19116ZZ-U218en-1.1 Scale selection modes The HMI41 automatically assumes the function selected in the setup menu when it is turned on again with the ON/OFF button. In the following, you will find a summary of the scale selection modes. DISPLAY RH % Td °C°F T °C°F DESCRIPTION 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.
HMI41 Calibration Option Appendix 1 19116ZZ-U218-1.1 2.2 Current output scale selection mode (I) DISPLAY WHAT TO DO Select the current output scale selection mode (I) Select the output (0...20 mA or 4...
HMI41 Calibration Option Appendix 1 2.3 Customized voltage output selection mode (cU) DISPLAY WHAT TO DO Select the customized voltage output scale selection mode (cU) RH Select the jumper selected RH channel’s voltage output range (0...1V, 0...5V, 0...
HMI41 Calibration Option Appendix 1 19116ZZ-U218-1.1 2.4 Customized current output selection mode (cI) DISPLAY WHAT TO DO Select the customized current output scale selection mode (cI) Select the RH channel’s current output range (4...20 mA, 0...20 mA) RH set RH set % Lo RH set % Select the T channel’s current output range (4...20 mA, 0...
HMI41 Calibration Option Appendix 1 2.5 19116ZZ-U218en-1.1 Calibration DISPLAY WHAT TO DO PRESS: Wait for about 5 seconds. RH T RH % RH % T °C T °C T °C T °C 6 Let the readings stabilize and then adjust the transmitter potentiometers until the readings are the same. Alternatively, you can calibrate the transmitter in the second RH calibration mode (see below).
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