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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Check that the reading corresponds with the reading of the reference instrument. If not, adjust the second point Press any key, enter the second point value and press <cr>. T : xx. x Ref2 ?yy. y <cr> · The stabilization of the sensor can be monitored by entering c <cr> instead of the reference value. With display/keypad commands Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Disconnect the security lock jumper! 7. 2. 2. 2. · · · Check the transmitter against the lower reference. Select Cali in the main menu and then T cal; select two-point calibration T 2 point cal. Change the temperature and check the transmitter against the higher reference. · 62 M210225en-B HMP230 SERIES User's Guide · · Check that the reading corresponds with the reading of the reference instrument. If necessary, change the second point reading with the arrow keys and press ENT. With LED commands Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Disconnect the security lock jumper! 7. 2. 2. 3. · · · Check the transmitter against the lower reference. At the first calibration point the LED on the left flashes; adjust the first point (offset) with the arrow switches to the same reading with the reference and press ENT switch. If necessary, adjust with the arrow switches to the correct value and press ENT. 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. [. . . ] status >r RH= 20. 1 %RH RH= 20. 2 %RH RH= 20. 1 %RH RH= 20. 2 %RH : T= T= T= T= OFF 26. 4 26. 4 26. 4 26. 4 'C 'C 'C 'C REGEN Starting re-gaining manually REGEN <cr> Re-gaining can also be started manually with command REGEN. The current re-gaining parameters (duration and settling times stored with command CRI) are used. Example: starting re-gaining >regen Regeneration started, press any key to abort > The prompt '>' appears when the heating period is over. However, the transmitter outputs are locked to values measured before re-gaining until the settling time is over. 152 M210225en-B HMP230 SERIES Appendix 9: Re-gaining Example: >regen Regeneration started, press >r S 162 RH= 20. 0 %RH T= 26. 5 S 162 RH= 20. 0 %RH T= 26. 5 S 162 RH= 20. 0 %RH T= 26. 5 . . . [. . . ]