User Manual

RH401 V1.4 09/04
3
Operation
Retractable Humidity and Air Temperature Sensor
Press down on the sensor, located at the top of the meter, to
release it. Humidity and air temperature will not be displayed if the
sensor is not extended.
After use, press the sensor into the stored (protected) position.
Power ON/OFF
Press the (or the button) to turn power on. The
meter will perform a short self-test when turned on.
Press and hold the button for three seconds to turn power off.
Humidity and Air Temperature measurements
1. Hold the meter in the area to be tested.
2. Allow adequate time for readings to stabilize.
3. View the Relative Humidity measurement in the lower display.
4. View the Air (probe)Temperature measurement in the middle display
Wet Bulb and Dew Point measurements
1. To display the Wet Bulb measurement, press and hold the button until the
symbol DP appears in the middle display.
2. Wet Bulb temperature is now displayed.
3. To display the Dew Point measurement, press and hold the button until the
symbol Wb appears in the middle display .
4. Dew Point temperature is now displayed.
5. To display IR temp –DP temp (IR surface temperature-Dew Point), press and hold the
button for more than 2 seconds then press the IR Temp button. The reading
can now be viewed in the top display.
6. Press and hold the button for more than 2 seconds to toggle the display back
to IR temperature.
Non-Contact InfraRed Surface Temperature measurements
1. Point the meter toward the surface to be measured.
2. Press and hold the button.
3. View the temperature measurement in the upper display
4. Release the and the reading will be held on the display until a new reading is
taken.
5. While holding down the button, press the button to toggle the laser
targeting pointer on/off. The symbol will appear in the middle left of the display
indicating that surface temperature measurement is active and the laser pointer is on.
WARNING! The Laser button
enables/disables the Laser pointer. When
enabled, each press of the button turns on the Laser beam. Avoid looking directly
into the path of the Laser or pointing the Laser toward anyone’s eyes. Mirrored surfaces
near a measurement object can redirect the Laser, use extreme caution. Do not allow
the Laser beam to be directed toward explosive gases.
Sensor
Extended
Stored
Sensor
Press Here
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