SICK GM32 - One-Off Initial Measurement - Determining the Test Gas Pressure

Maintenance
GM32 · Technical information · 8011923 · V1.4 · © SICK AG 77
Subject to change without notice
5.3.1 One-off initial measurement - determining the test gas pressure
The GPP probe remains installed in the gas duct.
1 Switch the GM32 to Maintenance (on the operator panel or in SOPAS ET menu: GM32/
Maintenance/Operating mode switch
 p. 56, §4.2.6.1)
2 Connect N
2
or instrument air to the probe via a pressure reducer (  p. 76, Fig. 16).
3 Set the pressure reducer to 0 bar, open the valve completely.
4 Set the pressure to approx. 3 bar.
5 Observe the measured values in the measured value display (operator panel or SOPAS
ET).
The measured value display must show “Zero”.
When “Zero” is not displayed after approx. 30 s (depending on the T
90
setting of the
analyzer): Increase the pressure gradually until “Zero” is displayed.
6 When “Zero” is displayed: Reduce the pressure in small steps until the measured value
display starts to rise.
Then increase the pressure by approx. 0.5 bar.
7 Note the pressure shown on the pressure gauge.
Use this value as primary pressure value in the future.
The difference pressure is in the range 2 mbar ... 30 mbar.
8 Close the valve on the pressure reducer.
9 If no further measurements are to be made: Set the GM32 back into measuring opera-
tion (on the operating console or in SOPAS ET menu: GM32/Maintenance/Operating
mode switch).
WARNING: Hazard through escaping gases
Hot and/or noxious gases can escape during work on the test gas connection,
depending on the equipment conditions.
 Test gases may only be applied by skilled persons who, based on their tech-
nical training and knowledge as well as knowledge of the relevant regula-
tions, can assess the tasks given and recognize the dangers involved.
Material required
SOPAS ET
Instrument air or N
2
Pressure gauge / pressure reducer
Supply line 1/4" with Swagelok fitting
Determine the test gas pressure again when the pressure in the gas duct
changes.