Operation; Mixing Ratio (Grains Per Pound Or Grams Per Kilograms); Dew Point; Wet Bulb - Extech Instruments RH490-NIST User Manual

Operation

Power
Press the power button "
%RH
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. The Relative Humidity measurement appears in the top display.
5. Pressing the "°F/°C/WBT/Dew Point" button toggles the lower
display between Temperature (°F), Temperature (°C), Dew Point
(°C), Dew Point (°F), Wet Bulb (°C) and Wet Bulb (°F).
6.

Mixing Ratio (Grains Per Pound or Grams Per Kilograms)

1.
To select GPP or g/kg 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.
The GPP or g/Kg measurement appears in the top display.
5.
Pressing the "°F/°C/WBT/Dew Point" button toggles the lower
display between Temperature (°F), Temperature (°C), Dew Point
(°C), Dew Point (°F), Wet Bulb (°C) and Wet Bulb (°F).

Dew Point

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.

Wet Bulb

1. To select the Wet Bulb measurement, press the "°F/°C/WBT/Dew
Point" button until WET BULB
(°F or °C) appears in the lower right.
2. Wet Bulb temperature is now displayed.
" to turn power on or off.
3
RH490-EU-EN-V2.2-07/13