High-Humidity Adjustment For Testo 6614 - TESTO 6381 Instruction Manual

4.3.4.12.

High-humidity adjustment for testo 6614

With the testo 6614, the rear of the Testo humidity sensor is
heated, creating a microclimate around the sensor (within the filter)
that is constantly 5 K warmer than the actual process conditions.
As can be seen in the Mollier diagram, this reduces the relative
humidity at the sensor from around 100 % RH to a lower value, e.g.
73 % RH. In this range, the reaction time of the sensor is noticeably
shorter than in the condensation range and the risk of the sensor
corroding is also reduced. Using the separate temperature probe,
the testo 6381 transmitter compensates the microclimate conditions
and displays the process readings.
The reference conditions (11.3 % RH and 75.3 % RH or 20
%RH and 80 %RH) for the 2-point adjustment of the
testo 6614 should be generated in a humidity generator, as
humidity adjustment sets cannot be used due to the heat
generated.
The adjustment can also be carried out at a third
adjustment point (90 % RH) by Testo Service so that
optimum accuracy is also achieved in the high humidity
ranges.
4 Transmitter
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