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Testing the humidity sensor
1. Press [MODE] to step through the diagnostic screens until you reach a screen that says
"THP" (for "temperature, humidity, pressure," although pressure is not supported) at the
top.
There are three numbers for the humidity reading ("H"). The first number is the current
humidity reading from the sensor. The second and third number are not used.
2. Fill a cup with warm water (>25° C/77° F).
3. Put a filter on the 3G PID's inlet probe.
4. Place the inlet probe over the warm water.
5. Cover the cup with your hand.
6. Wait a few seconds and check the high-humidity reading.
7. Verify that the first value increases. If it does not, then the THP Sensor (part number 023-
3011-000-FRU) should be replaced.
8. Check the low-humidity reading by connecting the inlet probe to a tank of zero gas (air at
0% humidity).
9. Turn on the zero gas and wait a few seconds for the sensor reading to stabilize. Verify that
the first number decreases. If it does not, the THP sensor should be replaced.
10. Once you have finished testing the humidity sensor, exit Diagnostic Mode by shutting
down the instrument (hold [MODE] through the countdown, and then release when it is
off).
Handheld PID Monitors
100
User Manual
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