Siemens Set CEM CERT, Руководство по эксплуатации, Страница: 39 / 128

Commissioning
7.1 Preparations
Set CEM CERT
Operating Instructions, 06/2021, A5E34491309-12
37
7.1.2 Leak test
The line systems were checked for leaks prior to delivery and their leakage rate complies
with the standard of the connection technology used according to EN 12266-1 (testing of
valves).
The gas paths must be tested sequentially based on the gas flow diagram.
You must disconnect the analyzers for this test because they could be destroyed if the
pressure is too high.
Check the system for leaks as follows:
1. Seal off the end of the respective gas path with a blanking plug.
2. Connect the test station to the gas inlet.
3. Open any solenoid valves, ball/plug valves, etc. so that the gas path is open from the
inlet up to the sealed outlet.
4. Increase the calibration gas pressure to maximum 0.5 bar (500 hPa; 7.25 psi).
5. Close the gas inlet with the stopcock at the test station.
6. Wait for about 10 minutes.
The pressure difference after 10 minutes must not exceed 1% of the test pressure.
If the pressure drop is greater, you must locate the leak. Leak detector spray can be very
helpful for this. In this case, also check the gaskets and glands.
The leak test can also be performed as a vacuum test with a vacuum pump.
7.1.3 Operating gases
The following calibration gases must be provided in order to guarantee problem-free
continuous operation:
• As zero gas for ULTRAMAT 23: Ambient air
• As zero gas for ULTRAMAT 6: Nitrogen with a purity of 5.0
• Specification of calibration gas (full-scale value gas): We recommend a full-scale
value calibration with a calibration gas containing the component to be measured in a
concentration of approximately 80% of the full-scale value.
Example: CO component measured with an ULTRAMAT 23 in the measuring range
0 ... 200 mg/m
3 . This yields an optimal calibration gas concentration of 200 mg/m 3 x
80% = 160 mg/m 3 CO. Nitrogen is typically added to make up the calibration gases.
To verify the compatibility of various calibration gas components, please contact your
calibration gas supplier.