User manual VAISALA HMM100

[. . . ] USER'S GUIDE Vaisala HUMICAP® Humidity Module HMM100 M211024EN-A 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 www. vaisala. com/ © Vaisala 2010 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Run the command and enter the exact RH of the reference after the measurement has stabilized. Exit the command by pressing the ESC key before proceeding to the second point (see example 1 below). For two-point calibration, the first point requires a RH < 50% humidity reference, the second point must be RH > 50%. There must also be at least 30 percentage points of difference between the references. 11. 3 Press any key when ready > Example: two-point calibration >crh RH: 11. 29915720 Ref1 ?75 OK > VAISALA _______________________________________________________________________ 37 USER'S GUIDE____________________________________________________________________ View User Adjustment Parameters Use the L command to view the current user adjustment parameters and trimmer adjustment. L<cr> The output values are as follows: - Cp offset and gain: capacitance, calibrated using the CRH command - RH trimmer offset and gain: correction by the trimmers - RH offset and gain: calibrated using the RHCAL command - T offset and gain: calibrated using the CT command Example (shows default values, no user calibration done): >l Cp offset Cp gain RH offset trimmer RH gain trimmer RH offset RH gain T offset T gain > : : : : : : : : 0 1 0 1 0 1 0 1 Set User Adjustment Parameters Use the LI command to set the user adjustment parameters directly. This command is useful for restoring the desired adjustments, and removing the effects of calibration without having to perform the factory reset. LI<cr> After entering the command, you will be prompted to enter new values one at a time. Example (shows default values): >li Cp offset Cp gain RH offset RH gain T offset T gain > : : : : : : 0 1 0 1 0 1 ?? 38 __________________________________________________________________ M211024EN-A Chapter 4 ________________________________________________________________ Operation Zero the Trimmers After physically turning the trimmers to zero, use the ZERO command to set the correction by trimmers to exactly zero. It is easy to introduce a small, unwanted correction even if trying to zero the trimmers exactly. > Calibrate Analog Output Use the ACAL command to calibrate the currently active analog output mode. You must use this command if you change the analog output mode using the AMODE command. ACAL<cr> After you give this command, the analog output of the module is set to the low limit of the selected output (voltage or current). After entering the low limit, you must measure and enter the high limit also. 20. 002 2. 00985160E+03 a0 1. 12789450E+03 a1 0. 00000000E+00 a2 OK > Example (analog output in 0 . . . 0. 998 5. 45999950E+02 a0 1. 64128260E+03 a1 0. 00000000E+00 a2 OK > VAISALA _______________________________________________________________________ 39 USER'S GUIDE____________________________________________________________________ Configuring Serial Line Operation Set Serial Line Settings Use the SERI command to show or set the serial line settings. The new settings will be taken into use when the module is reset or powered up. SERI [b p d s]<cr> where B P D S = = = = baud rate (9600, 19200, 38400, 76800, 115200) parity (n = none, e = even, o = odd) data bits (7 or 8) stop bits (1 or 2) Examples: >seri Baud P D S > : 19200 N 8 1 >seri 9600 e 7 1 Baud rate : 9600 Parity :E Data bits :7 Stop bits :1 >save Saving settings. . . done > Set Terminal Echo To show or set the terminal echo status, use the ECHO command. ECHO [ON/OFF]<cr> Examples: >echo Echo > >echo on Echo > : ON ? : ON 40 __________________________________________________________________ M211024EN-A Chapter 4 ________________________________________________________________ Operation Set Module Address To operate in the POLL mode, the module must have an address. If multiple modules share the same serial line, each module must have a different address. [. . . ] You can also disable this error notification behavior; see section Show Calibration Info on page 32. VAISALA _______________________________________________________________________ 61 USER'S GUIDE____________________________________________________________________ Solving Typical Problems You can check the error message via the serial interface by using the ERRS command. Table 9 Troubleshooting Table Likely Causes and Solutions - Sensor(s) damaged or missing. - Check the analog output mode using the AMODE command. Problem or Message Measurement not working, any of the following errors active: - Temperature sensor open circuit/not calibrated - Humidity sensor open circuit/not calibrated - Temperature sensor values out of range Humidity measurement appears to be wrong. The following errors may be active: - RH reading too high - RH reading too low The following error is active: - Capacitance out of range Measurement stops, with following errors active: - Analog output test on, no measurements done - MeasTask not calculating (ATEST) Serial line command not working, outputs "Unknown command. " - Check for condensation on the probe and sensor. [. . . ]