User manual VAISALA MMT162

[. . . ] USER'S GUIDE Vaisala HUMICAP Moisture and Temperature Transmitter for Oil MMT162 ® M210934EN-B 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 http://www. vaisala. com/ © Vaisala 2009 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] - For voltage output, an active alarm is indicated by the voltage being at the maximum of the selected scale. If the transmitter is malfunctioning or it cannot measure for some reason, this causes the LED to blink at 0. 5 Hz frequency. LED alarm indicator is integrated to a LED cable (Vaisala item MP300LEDCBL) that can be ordered and used instead of a regular connection cable. 22 __________________________________________________________________ M210934EN-B Chapter 4 ________________________________________________________________ Operation Serial Communication Connecting to Serial Interface The MMT162 can be connected to a PC using the RS-485 line, for example using the USB serial connection cable (Vaisala item 219690). The cable also provides operation power to the transmitter from the USB port. It is OK to connect the USB serial connection cable even if the transmitter is already supplied with operation power from another cable. If you have not used the MMT162 USB serial connection cable before, install the driver that came with the cable. Refer to section Installing the Driver for the USB Cable on page 24 for detailed instructions. Connect the USB serial connection cable between your PC and the RS-485 port of the MMT162 (port II). Set the serial settings of the terminal program, and open the connection. Default Serial Interface Settings Description / Value 19200 none 8 1 2. 4. Table 4 Property Baud rate Parity Data bits Stop bits NOTE In case the transmitter starts up in an error state, the serial interface settings are automatically returned to the default settings given in Table 4 above. VAISALA _______________________________________________________________________ 23 User's Guide ______________________________________________________________________ Installing the Driver for the USB Cable Before taking the USB cable into use, you must install the provided USB driver on your PC. When installing the driver, you must acknowledge any security prompts that may appear. The driver is compatible with Windows® 2000, Windows® XP, Windows Server® 2003, and Windows® Vista. Insert the media that came with the cable, or download the driver from www. vaisala. com. Execute the USB driver installation program (setup. exe), and accept the installation defaults. After the driver has been installed, connect the USB cable to a USB port on your PC. Verify the port number, and the status of the cable, using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu. 4. 5. Windows will recognize each individual cable as a different device, and reserve a new COM port. Remember to use the correct port in the settings of your terminal program. If you are using the Vaisala MI70 Link application, you do not need to check the COM port, as the MI70 Link detects the USB connection automatically. However, if you wish to remove the driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for Vaisala USB Instrument Driver from the Add or Remove Programs (Programs and Features in Windows Vista) in the Windows Control Panel. 24 __________________________________________________________________ M210934EN-B Chapter 4 ________________________________________________________________ Operation Terminal Program Settings The default settings of the MMT162 serial interface are presented in Table 4 on page 23. If the settings of your MMT162 have been changed and you do not know what they are, refer to section Restore Factory Settings on page 41. The steps below describe how to connect to the MMT162 using the PuTTY terminal application for Windows (available for download at www. vaisala. com) and a USB serial interface cable: 1. [. . . ] Vaisala HUMICAP® hand-held moisture and temperature in oil meter MM70 can also be used for calibration. VAISALA _______________________________________________________________________ 51 User's Guide ______________________________________________________________________ MM70 in Checking and Adjusting MMT162 can be checked and adjusted by using the MM70. In the field you can check and adjust the probe's reading against the calibrated reference probe of the MM70. Connect the MMT162 to the MM70 indicator with the appropriate connection cable (Vaisala item 219980). Prepare the probe for adjustment by opening the adjustment menu on the MM70 (Menu Functions Adjustments) Make sure that both probes are stabilized to same conditions so that the temperature readings are the same. NOTE 4. Press the OK key to start adjustment. One-Point Relative Humidity Adjustment Note that the humidity reference must be at least 50% RH. [. . . ]