97
8009389/YN39/V3-0/2015-08| SICK OPERATING INSTRUCTIONS|GM35
Subject to change without notice
TEST GAS MEASUREMENT WITH GPP MEASURING PROBES
Fig. 60: Gas connections on the GPP measuring probe
8.1 One-off preliminary measurement/determining the settings
Every GPP is subject to certain fluctuations in production that cannot be compensated, or
only with extreme effort (e.g., porosity of the filter frit) and the filters can have different
lengths and different materials, so that ideal pressure parameters for test gas
measurement must be determined before the first measurement. The GPP remains
installed in the gas duct.
Preparations For zero gas, as above (e.g., N
2
or air)
1 Start manual test.
2 Set the pressure reducer to 0 bar, open the valve fully
3 Set the pressure to approx. 3 bar and observe the measured values and, if zero is not
reached after a certain period of time (30 s, depending on the T
90
setting of the
analyzer), increase the pressure gradually until zero is reached.
4 When zero is reached reliably, reduce the pressure gradually, observe the measured
values, and when the values are higher than zero again, increase the pressure again by
approx. 0.5 bar.
5 Note the pressure on the pressure gauge display on the EvU, these values can be used
in future as default values for pressure values. The differential pressure is in the range
> 2 mbar < 30 mbar.
6 Close the valve on the pressure reducer; close the gas cylinder.
1st connection:
Gas inlet
2nd connection
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