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Summary of Contents for Extech Instruments RH390
- Page 1 User's Guide Digital Psychrometer Model RH390 °F•°C•WBT Dew Point...
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Page 2: Specifications
Introduction Congratulations on your purchase of the Extech RH390 Digital Psychrometer. This device measures Humidity, Air Temperature, Dew Point temperature and Wet Bulb temperature. Advanced features include Data Hold, Auto Power Off, and MAX/MIN reading. Careful use of this meter will provide years of reliable service. - Page 3 Note: The battery compartment is located on the rear of the instrument Display Description Relative Humidity % Dew Point Wet Bulb MAX MIN °C/°F Temp/WB/DP Display Maximum Minimum Low Battery °C °F Hold Dewpoint RH% Display WetBulb Auto Off RH390-EU-EN V2.2 2/11...
- Page 4 Dew Point (°F), Wet Bulb (°C) and Wet Bulb (°F). Dew Point measurements 1. To select the Dew Point measurement, press the °F/°C/WBT/Dew Point button until DEWPOINT (°F or °C) appears in the lower right. 2. Dew Point temperature is now displayed. °C °F Dewpoint RH390-EU-EN V2.2 2/11...
- Page 5 Data Hold Press the hold button ( momentarily to freeze the displayed readings.”HOLD” will appear on the upper left-hand side of the display. Press the hold button ( ) again to return to normal operation. °C °F WetBulb RH390-EU-EN V2.2 2/11...
- Page 6 ) while powering on. The symbol will not appear when auto power off has been disabled. °C °F The meter will revert to the default auto-off mode when powered off. RH390-EU-EN V2.2 2/11...
- Page 7 Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle Copyright © 2011 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form.
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