User manual VAISALA HMT100

[. . . ] USER'S GUIDE Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT100 ® M210701EN-D PUBLISHED BY Vaisala Oyj P. O. Box 26 FI-00421 Helsinki Finland Phone (int. ): +358 9 8949 1 Fax: +358 9 8949 2227 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. 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. ________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 4. 4 5. 3 6. 2 1 0505-181 7. Loosen the plastic probe cover by carefully turning it counter clockwise. Unscrew the small sleeve that is securing the probe in place and pull out the probe. Replace the probe and screw the small sleeve back on, securing the probe tightly in place. Replace the O-ring and the probe cap. Figure 11 Removing the Humidity Probe (Fixed Probe Model) The following numbers refer to Figure 11 above: 1 2 3 4 = = = = Probe cap Probe cover O-ring HMP100 probe 26 __________________________________________________________________ M210701EN-D Chapter 4 ______________________________________________________________ Maintenance Remote Probe Model 1. Unscrew the small sleeve that secures the probe in place at the end of the probe cable and pull out the probe. Replace the probe and screw the small sleeve back on, securing the probe tightly in place. 1 2 3 0506-006 Figure 12 Removing the Humidity Probe (Remote Probe Model) The following numbers refer to Figure 12 above: 1 2 3 = = = Probe cable Sleeve securing the probe to the cable HMP100 probe VAISALA _______________________________________________________________________ 27 User's Guide ______________________________________________________________________ Calibration and Adjustment Calibrate and adjust the HMT100 using the push-buttons on the motherboard or with portable humidity meters HM70 or HMI41. A calibrator kit is needed for calibration against saturated salt solutions. The HMK15 Humidity Calibrator and pre-measured certified salts are available from Vaisala. Vaisala Service Centers also offer accredited calibrations for humidity and temperature. It is also possible to remove the HMP100 probe and replace it with a new one. The old probe can be adjusted using another HMT100 transmitter body, if you have one available. NOTE RH Field Calibration and Adjustment, as instructed in the following pages, is restricted to a certain adjustment range to minimize the effects of special circumstances, such as chemical contamination. In case the probe is outside its adjustment/trim range due to, for example, chemical exposure, the calibration cannot be completed. In this case, it is recommended that you change the probe or contact Vaisala Services. Relative Humidity Adjustment Using Push Buttons 0505-182 Figure 13 Adjustment Buttons A simple push-button adjustment is carried out using two relative humidity references: 11. 3 % RH (LiCl) and 75. 5 % RH (NaCl). Open the transmitter cover. 28 __________________________________________________________________ M210701EN-D Chapter 4 ______________________________________________________________ Maintenance 3. The indicator LED blinks evenly, indicating that the measurement is changing. Wait for 30 minutes or until the indicator LED stops blinking and is lit continuously, which means that the measurement has stabilized. The transmitter returns to the normal operation mode, and the indicator LED turns off. To start calibrating the 75 % RH condition, press the ADJ button on the transmitter motherboard again. Wait for 30 minutes or until the indicator LED stops blinking and is lit continuously. The transmitter returns to the normal operation mode, and the indicator LED turns off. Replace the filter and the probe cover. Adjustment with HM70 You can check and adjust the HMT100 relative humidity measurement with the HM70 Hand-Held Humidity and Temperature meter. There are four types of adjustments available: field checking and adjustment using a calibrated reference probe, one-point adjustment using a calibrator, two-point adjustment using a calibrator, and LiClNaCl adjustment. [. . . ] Check that the serial line settings in the HMI41 memory correspond to those of the transmitter. VAISALA _______________________________________________________________________ 39 User's Guide ______________________________________________________________________ Analog Output Tests HMT100 has a built-in software function for testing the analog outputs. This sets the output current/voltage level to the middle point of the selected output range (specified when ordering the product). The output stays at this level for about 30 seconds after the 75 % adjustment button has been pressed. Examples: If you have specified 4 . . . 20 mA analog output range, pressing the 75 % adjustment button will set the current output at 12. 0 mA for about 30 seconds. [. . . ]