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Summary of Contents for Extech Instruments RH490-NIST
- Page 1 User's Guide Precision Hygro-Thermometer Model RH490...
- Page 2 Introduction Congratulations on your purchase of the Extech RH490 Precision Hygro-Thermometer. This device measures Humidity, Air Temperature, Dew Point temperature, Wet Bulb temperature and Grains of Water Vapor per Pound of Air. Advanced features include Data Hold, Auto Power Off, and MAX/MIN reading.
- Page 3 Operation Power Press the power button “ “ to turn power on or off. 1. To select %RH measurement, press the “%RH/GPP/g/Kg” button. 2. Hold the probe in the area to be tested. 3. Allow adequate time for readings to stabilize. 4.
- Page 4 Temperature To select the temperature measurement, press the “°F/°C/WBT/Dew Point” button until “°C” or “°F” appears in the lower right. Temperature is now displayed. Data Hold Press the ”H MAX MIN” button momentarily to freeze the displayed readings. ”HOLD” will appear on the upper left-hand side of the display.
- Page 5 Maintenance Cleaning and storage 1. The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives. 2. Store the meter in an area with moderate temperature and humidity (refer to the operating and storage range in the specifications chart earlier in this manual).
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