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Technical Note
Overview
This document provides instructions for adjustment of relative humidity and temperature in Vaisala
HMD82M and HMW88M humidity and temperature transmitters.
For the adjustment procedure, you will need the following:
•
USB service cable (order code ASM212800)
•
Computer with:
•
Medium-size crosshead screwdriver (Pozidriv) for the screws on the cover
•
Small slotted screwdriver for the screw terminals
Using Service Port
The HMD82M and HMW88M transmitters have a serial interface on the component board for user
adjustment. You can connect to it through the 4-pin M8 service port connector on the transmitter.
Vaisala offers an optional USB service cable (order code ASM212800) for connecting the transmitter to
your PC.
The service port is intended for short-term use such as adjustment. For permanent installation, use the
analog output.
Adjustment of Relative Humidity and
Temperature
HMD82M and HMW88M Transmitters
•
Windows operating system
•
Free USB port
•
Driver for the USB service cable installed. See
(page
2).
•
Terminal application (for example PuTTy). See
(page
2).
All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners.
PUBLISHED BY
Any reproduction, transfer, distribution or storage of information contained in this document is strictly
Vaisala Oyj
prohibited. All specifications — technical included — are subject to change without notice.
Vanha Nurmijärventie 21
FI-01670 Vantaa, Finland
Phone:+358 9 8949 1
© Vaisala 2018
Taking USB Service Cable into Use
Connecting to HMD82M/HMW88M
M212167EN-A
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Summary of Contents for Vaisala HMD82M
- Page 1 Small slotted screwdriver for the screw terminals Using Service Port The HMD82M and HMW88M transmitters have a serial interface on the component board for user adjustment. You can connect to it through the 4-pin M8 service port connector on the transmitter.
- Page 2 Technical Note M212167EN-A If you have not used the HMD82M/HMW88M USB service cable before, install first the driver for the cable. See Taking USB Service Cable into Use (page Taking USB Service Cable into Use Before taking the USB service cable into use, you must install the USB driver on your PC. The following instructions are for PCs with Windowsâ...
- Page 3 To access the configuration screen while a session is running, click the right mouse button over the session window, and select Change Settings... from the pop-up menu. Figure 1 PuTTY Terminal Application Table 1 HMD82M and HMW88M Default Serial Interface Settings Property Description / Value Baud rate...
-
Page 4: List Of Serial Commands
Two-point temperature adjustment requires a second reference point that is at least 20 °C warmer than the first point. As a reference instrument, you can use, for example, Vaisala Humidity Calibrator HMK15 or the Vaisala HUMICAPâ Handheld Humidity and Temperature Meter HM70. For more information on the HMK15 and the HM70, see the respective User's Guides in www.vaisala.com. - Page 5 Technical Note M212167EN-A Adjustment of Relative Humidity and Temperature Prepare the HMD82M/HMW88M transmitter for a service port connection, as instructed in Using Service Port (page 1) Connecting to HMD82M/HMW88M (page With the USB service cable connected, issue the L serial line command and write down the current adjustment values, so that you can restore them manually if necessary.
- Page 6 Technical Note M212167EN-A Use the SEND command to monitor the stabilization of the measurement reading. Syntax: SEND<cr> Example: send RH= 40.10 % T= 22.36 'C send RH= 41.40 % T= 23.66 'C send RH= 42.70 % T= 24.96 'C If you only want to perform a one-point adjustment, calculate the offset correction using the measured values and the following formula, where "Ref"...
-
Page 7: Analog Output Settings
Technical Note M212167EN-A Use the SEND command to output a single measurement reading. You can use the command to monitor the stabilization of the reading and to verify the adjustment. Syntax: SEND<cr> Example: send RH= 42.70 % T= 24.96 'C Analog Output Settings The ASEL command can be used to show or select the analog output measurement parameters ("quantities"), and the scaling that is used. - Page 8 Technical Note M212167EN-A Example (change output to T, low limit to -10 and high limit to +60): asel 1 T -10 60 Analog output 1: Quantity Level Lo : -10.000000 Level Hi : 60.000000 8 (8)