User manual VAISALA HMP230

[. . . ] HMP230 Series Transmitters USER'S GUIDE M210225en-B May 2002 PUBLISHED BY Vaisala Oyj P. O. Box 26 FIN-00421 Helsinki Finland Phone : Fax: (+358 9) 894 91 (+358 9) 8949 2227 Visit our Internet pages at http://www. vaisala. com/ © Vaisala 2002 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. M210225en-B HMP230 SERIES User's Guide Contents 1. PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Change the temperature and check the transmitter against the higher reference. Check that the reading corresponds with the reading of the reference instrument. If not, adjust the second point. · · · 7. 3. Calibration of the analogue outputs The analogue outputs have been calibrated at the factory and since they are very stable, calibration of the outputs should be performed only when there is reason to believe that their adjustments have changed. With serial commands Disconnect the security lock jumper! ACAL <cr> The outputs on channels 1 and 2 are measured and the measured values (mA or V) entered as calibration coefficients. Example: both channels have 0. . . 10 V outputs (set with AMODE command); enter the voltages measured at the analogue outputs: 63 HMP230 SERIES User's Guide M210225en-B >ACAL <cr> Ch1 U1 ( Ch1 U2 ( Ch2 U1 ( Ch2 U2 ( V V V V ) ) ) ) ?? 2. 233 <cr> 8. 25 <cr> 2. 218 <cr> 8. 23 <cr> 7. 3. 2. With display/keypad commands Disconnect the security lock jumper! · Connect an ammeter/voltmeter to the output of channel 1, select Cali in the main menu and Analog outputs in the Cali menu. The following is displayed (the quantity can be either mA or V): · Enter the measured lower end current/voltage on channel 1. · Enter the measured upper end current/voltage on channel 1. · Connect the meter to the output of channel 2 and enter the measured lower end current/voltage on channel 2. · Enter the measured upper end current/voltage on channel 2. 7. 3. 3. With LED commands If both the analogue outputs and humidity/temperature channels are calibrated, the analogue outputs should be calibrated first. This applies only when the calibrations are made using the LED commands! · connect an ammeter/voltmeter to the analogue outputs (connector X2) Disconnect the security lock jumper! · Give command ¡¡ll. 64 M210225en-B HMP230 SERIES User's Guide · · · · the LED on the left flashes; set the low end of channel 1 with the arrow keys and press ENT the second LED from the left flashes; set the high end of channel 1 with the arrow keys and press ENT the LED on the left flashes; set the low end of channel 2 with the arrow keys and press ENT the second LED from the left flashes; set the high end of channel 2 with the arrow keys and press ENT The analogue outputs are calibrated to ensure that outputs are correctly scaled: for example, when the output is scaled to 4. . . 20 mA, the low end of the scale is 4 mA and high end 20 mA exactly. 20 mA output is used, the output cannot be adjusted to exactly 0 mA, but to 50 µA. When 0. . . 1 V, 0. . . 5 V or 0. . . 10 V output is in use, the output is adjusted to 50 mV. The following table summarizes the correct output values. Summary of the correct output values: Output scale: 0. . . 20 mA 4. . . 20 mA 50 µA 4 mA 20 mA 20 mA low end: high end: 0. . . 1 V 50 mV 1V 0. . . 5 V 50 mV 5V 0. . . 10 V 50 mV 10 V 65 HMP230 SERIES User's Guide M210225en-B 8. 8. 1. MAINTENANCE Reference measurements Reference measurements are needed to verify whether the transmitter readings are within specifications. This way the user can check if the transmitter needs calibration or service. The reference meter should preferably use the same technology as the instrument checked, i. e. transmitters with capacitive sensors should be checked with instruments using capacitive sensors. This minimizes the risk of errors caused by different measurement techniques. Whatever technique is used, make sure the reference instrument is at the same temperature as the checked instrument in order to avoid errors caused by temperature differences. The reference measurement should be made as close to the checked sensor as possible and the readings should be read at the same time, when possible. The best reference measurements are made in laboratories. If it is possible to take the transmitter out of process or control system, make the reference measurement in a laboratory where the conditions are stable. 8. 2. Self-diagnostics The HMP230 transmitters go through a self-diagnostics procedure when the power is switched on. [. . . ] N 162 RH= 18. 4 %RH T= 27. 7 N 162 RH= 18. 5 %RH T= 27. 6 N 162 RH= 18. 8 %RH T= 27. 5 any key to abort 'C 'C 'C 'C 'C 'C heating is finished, settling time is on and outputs are locked settling time is over and outputs are released Re-gaining cannot be started if automatic re-gaining (heating/cooling) is on at that moment, the temperature of the sensor exceeds 100 °C or the security lock jumper is off. In these cases the 'Regeneration started. . . ' text is not output by the transmitter but the prompt '>' appears immediately. Example: >regen >r H 162 RH= 19. 7 %RH T= 26. 4 'C H 162 RH= 19. 7 %RH T= 26. 4 'C H 162 RH= 19. 7 %RH T= 26. 4 'C forced re-gaining failed as automatic re-gaining (heating) is going on 153 HMP230 SERIES Appendix 9: Re-gaining M210225en-B 6. TECHNICAL DATA Power consumption during re-gaining (without alarm output unit) 170 mA maximum (24 VDC) NOTE The optional power supply module cannot be used in a a transmitter which includes the re-gaining option. Sensor Sensor protection RH & T composite sensor (part no. [. . . ]