SICK GM35

96
8009389/YN39/V3-0/2015-08| SICKOPERATING INSTRUCTIONS|GM35
Subject to change without notice
TEST GAS MEASUREMENT WITH GPP MEASURING PROBES
8 Test Gas Measurement with GPP Measuring Probes
Fig. 59: Test gas measurement on the GM35
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
to check pressure measurement, for sample extraction for comparison measurements, to
increase the test gas quantity for test purposes.
Feeding test or zero gas creates overpressure in the filter element. If the overpressure is
high enough, the entire sample gas is forced out of the filter element by a gas flow that is
formed in the opposite direction through the filter element. The flow within the filter element
must be greater than the diffusion rate of the gases to ensure the sample gas is forced out
of the filter element.
This method can be used for measuring the zero point with nitrogen or air, as well as for
measuring test points with the relevant gases and concentrations.
GM35 SR-unit
Evaluation unit
Gas cylinders