15.6. Trouble Shooting Guide
15.6.1. The measured value is flow dependent and too high (i.e. too
humid)
15.6.2. The measured value is too high (i.e. too humid)
The humidity measurement system
has not yet stabilised. Stabilisation
process.
Observe stabilisation time. If the measuring device is unused and stored for
extended periods in a humid environment, and especially for low dew point
values, observe a stabilization time of up to one hour in order to dry out the
measuring chamber and the sintered filter. Compressed air must flow through the
measuring chamber during this time.
The sample line is not airtight.
Find and repair the leak.
The plastic test line is unsuitable.
Use a Teflon (PTFE) tube.
There is condensate in the measuring
chamber or in a screw thread.
Dry out the components, allow a through flow of air and observe the stabilization
time.
There is condensate in the system.
The lines have not yet dried out
following an incident.
It may take several days to dry the system following a malfunction. Take the first
test measurements as near to the dryer as possible.
The filter is dirty; the setting time is
too high.
Send the probe to the manufacturer to change the filter.
Send the probe to the manufacturer to be repaired.
There is condensate in one of the
spur lines of the distribution line. In
this case, the humidity will
continuously rise, especially in the
absence of any air intake (e.g. at
night).
This is a common occurrence in many systems. Following a malfunction caused
by a build-up of condensate, it takes a long time for all the spur lines to dry out
again (without airflow). This is particularly the case in spur lines in cold areas.
Draw off air from seldom-used spur lines (i.e. allow air to flow through the line) in
order to dry out the line segment.
The capillary tube of the measuring
chamber is blocked.
Send the probe to the manufacturer to replace the measuring chamber.
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