Operation - Extech Instruments RH401 User Manual

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
perform a short self-test when turned on.
Press and hold the
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 Dew Point measurement, momentarily press the
DP appears in the middle display.
2. Dew Point temperature is now displayed.
3. To display the Wet Bulb measurement, momentarily press the
Wb appears in the middle display .
4. Wet Bulb temperature is now displayed.
5. To display the IR surface temp – DP temp temperature press and hold the
more than 2 seconds. The
IR Temp button. The differential temperature reading can now be viewed in the top display.
6. Press and hold the
temperature.
Non-Contact InfraRed Surface Temperature measurements
1. Point the meter toward the surface to be measured.
2. Press and hold the
3. View the temperature measurement in the upper display
4. Release the
5. While holding down the
pointer on/off. The
temperature measurement is active and the laser pointer is on.
WARNING! The Laser button
press 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.
nd Quality Products Online at:
(or the button) to turn power on. The meter will
button for three seconds to turn power off.
icon will appear in the top left corner of the display, then press the
button for more than 2 seconds to toggle the display back to IR
button.
nd the reading will be held on the display until a new reading is taken.
button, press the
symbol will appear in the middle left of the display indicating that surface
enables/disables the Laser pointer. When enabled, each
button turns on the Laser beam. Avoid looking directly into the path of the
GlobalTestSupply
www.
button to toggle the laser targeting
3
.com
Press Here
Sensor
Extended
Sensor
Stored
button until the symbol
button until the symbol
button for
RH401-en-GB_ V1.7 1/17
sales@GlobalTestSupply.co