Functional Description Of Desiccant Chamber - Alpha Moisture Systems SADPmini2-Ex User Manual

SADPmini2-Ex User Manual
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Functional Description of Desiccant Chamber

Keeping the sensor dry between tests makes sure that the SADPmini2-Ex is ready to
carry out rapid sample checks. The design of the Desiccant Head achieves this by
surrounding the Aluminium Oxide Sensor with desiccant, keeping the sensor dry when
not in use.
A sample of the process gas or air is piped to the inlet port. The sample flows through
the measuring chamber while the Desiccant Head remains in position over the
Aluminium Oxide Sensor.
Restricting the continuous flow of the sample by closing off the opposite
port causes a pressure increase inside the instrument which raises the Desiccant
Head and exposes the Aluminium Oxide Sensor to the sample. When the desiccant
chamber is fully extended the outlet flow restriction should be removed and the
sample gas allowed to flow through to the measuring sensor.
When measurement is complete, manually depress the desiccant chamber until it is
fully closed. Disconnect the sample pipe from the instrument.
Between tests the sensor should not be exposed to ambient air. The chamber
is designed so that the void space and chamber wall surfaces can be purged with
sample gas before the sensor is exposed to the sample gas which allows the
SADPmini2-Ex to provide faster, more accurate and reliable results.
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