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RH490 Datasheet, PDF (4/7 Pages) Extech Instruments Corporation. – Precision Hygro-Thermometer | |||
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Operation
Power
Press the power button â â to turn power on or off.
%RH
1. To select %RH measurement, press the
â%RH/GPP/g/Kgâ button.
2. Hold the probe in the area to be tested.
3. Allow adequate time for readings to stabilize.
4. The Relative Humidity measurement appears in the
top display.
5. Pressing the â°F/°C/WBT/Dew Pointâ button
toggles the lower display between Temperature
(°F), Temperature (°C), Dew Point (°C), Dew Point
(°F), Wet Bulb (°C) and Wet Bulb (°F).
Mixing Ratio (Grains Per Pound or Grams Per Kilograms)
1. To select GPP or g/kg measurement, press the
â%RH/GPP/g/Kgâ button.
2. Hold the probe in the area to be tested.
3. Allow adequate time for readings to stabilize.
4. The GPP or g/Kg measurement appears in the top
display.
5. Pressing the â°F/°C/WBT/Dew Pointâ button
toggles the lower display between Temperature
(°F), Temperature (°C), Dew Point (°C), Dew Point
(°F), Wet Bulb (°C) and Wet Bulb (°F).
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RH490 V2.0 12/06
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