Operating Instructions GM35
Probe Model
Test Gas Measurement with GPP Measuring Probes
8009389/07-2006 © SICK MAIHAK GmbH • Germany · All rights reserved 63
7 Test Gas Measurement with GPP Measuring Probes
Fig. 35 Test gas measurement on the GM 35
The GPP measuring probe supports on-line gas tests. For this purpose, the GPP probe is
equipped with a gas connection for conducting test gas measurements. The second
connection can be used for checking the pressure measurement, sampling for comparison
measurements, filter backflushing, or to increase the test gas quantity for test purposes.
By supplying test or neutral gas, an overpressure is created in the measurement
environment. If this overpressure is sufficient, the entire measurement gas is forced out of
the cavity, since a gas flow is formed in the opposite direction through the filter frit. The flow
within the filter frit must be greater than the diffusion rate of the gases to ensure that the
measurement gas is forced out of the cavity.
This method can be used to measure the zero point with nitrogen or air, as well as test
points with the relevant gases and concentrations.
Measuring
025
O
2
#1
O
2
#2
O
2
#3
%
Vol.
11.2
GM 35 SR unit
Evaluation unit
1st connection:
gas inlet
2nd connection:
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