User manual VAISALA HMP45D

[. . . ] USER'S GUIDE Vaisala HUMICAP® Humidity and Temperature Probes HMP45A/D U274EN-1. 2 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. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. [. . . ] All calibration electronics are in the probe head which can be disconnected from the handle without disconnecting the wires (see Figure 2). If you wish to continue the measurement immediately, you can insert a calibrated probe head in place of the disconnected one; this way, the measurement is interrupted for less than a minute. 3. 1 Reading the outputs during calibration NOTE: remove the O-ring if you connect the probe directly to the HMI41 indicator adjustment trimmers: W = wet D = dry (T = temperature; for factory use only!) pull the probe head off the handle Figure 2 In calibration, the HMP45A/D output is normally read from the output cables. The HMP45A probe head can also be checked with Vaisala's HMI41 indicator (see Figure 2); the probe head can be connected either to the HMH45 handle, or directly to the HMI41 indicator. However, note that if you connect the probe head directly to the HMI41, you must first remove the O-ring. A simple field check can also be performed when there seems to be something wrong with the measurement system. It is sufficient to compare the HMP45A reading with the reading measured by a calibrated reference probe head. Check 2 W D T MODE H O LD E NT ER O N /O F F HM H45 H M I4 1 Adjustment trimmers and probe head connection/disconnection U274en-1. 2 HMP45A and HMP45D Operating Manual the ambient relative humidity and temperature level with the reference probe head, and then connect the HMP45A probe head on the HMH45 handle and check the output readings. Prepare the HMI41 indicator for measurements with the HMP45A probe head as follows: turn the HMI41 indicator on and within 1-2 seconds press simultaneously buttons ENTER and MODE until the text SEtUP appears on the display. Wait a few seconds, and the text Unit appears; press ENTER repeatedly until a text similar to the following appears on the display: set Select PROBE TYPE 3 with buttons L (number up) or M (number down) and turn the indicator off. After a few seconds, the relative humidity and temperature readings appear automatically on the display. The HMP45D cannot be used with the HMI41 indicator as the passive temperature signal results in error messages on the HMI41. 3. 2 Humidity calibration For a high-accuracy two-point calibration use a Vaisala HMK15 or HMK13B calibrator and saturated salt solutions as described in the respective manuals. Leave the calibrator, the HMI41 and the probe head in the same space for at least four hours so that their temperatures have time to equalize. The calibration is done first for the dry end and then for the wet end by adjusting trimmer potentiometers marked "D" (dry, <50 %RH) and "W" (wet, >50 %RH). [. . . ] 2787HM 5 HMP45A and HMP45D Operating Manual U274en-1. 2 240 (9. 45) 118 (4. 65) A 24 18. 5 3500 (137. 8) A A-A 20. 5 (0. 81) (0. 94) 24 (0. 94) REMOVABLE PROBE HEAD ( 0. 72) (132 mm) 5. 4 Electromagnetic compatibility 5. 4. 1 Emissions Radiated interference, test setup according to EN55022 5. 4. 2 Test: Immunity Test setup according to: IEC 1000-4-3 IEC 801-4 Performance: Radiated interference Electrostatic discharge HMP45A level 1 (3V/m) HMP45D level 3 (10 V/m) level 4 (HMP45A&D) GUARANTEE Vaisala issues a guarantee for the material and workmanship of this product for one (1) year from the date of delivery. Damage due to exceptional operating conditions, careless handling or misapplication will void the guarantee. Detailed warranty information is given in the Warranty and the Standard Conditions of Sale of Vaisala Oy. 6 www. vaisala. com *U274EN* [. . . ]