9. Troubleshooting
9.1 Problems and Their Possible Solutions
If you have a problem with using the probe, check the following tables before contacting
Vaisala. If the problem you have is not listed in the tables, or if the proposed solution does not
fix the problem, contact Vaisala technical support.
You can check the probe diagnostics and status with the Insight software and Modbus status
registers (see
).
Problem: Response time is slower than specified.
Possible Cause:
Solution:
The filter is blocked.
Change the filter.
Be careful not to touch the sensors when the filter is off the
probe.
The probe has fallen and the
filter has hit the floor.
Remove the filter and visually check the sensors.
• If the sensors are bent, broken, or disconnected, contact
Vaisala technical support.
• If the sensors are intact, change the filter. The filter is made of
porous material, and if the filter hits the floor, the filter material
may get pressed and become less permeable. This reduces the
rate at which air flows in and out of the filter, directly affecting
the measurement.
Be careful not to touch the sensors when the filter is off the
probe.
The probe has been exposed to
unsuitable chemicals (for
example, DMSO).
Change the filter and perform a chemical purge.
Be careful not to touch the sensors when the filter is off the
probe.
The measurement filtering
factor is configured to be too
slow.
Use the Vaisala Insight software, Modbus configuration register
030A
hex
, or an Indigo 200 transmitter to disable the filtering
factor (set filtering factor to "1"), and check the measurement
again. See:
•
Measurement Filtering Factor (page 12)
•
Vaisala Insight Software (page 28)
•
Configuration Registers (page 48)
The ambient temperature has
changed quickly, which may
result in a slower change in RH
reading.
No actions required.
HPP272 User Guide
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