ABB SCC-S, Operator'S Manual, Page: 27 / 40

27
Checking Gas Path Seal Integrity
When must the gas feed path be checked for leaks?
The gas paths should be checked for leaks regularly. They must be checked after
the gas paths inside the feed unit have been opened.
NOTE
The feed unit must be checked from both sample gas connections because of the
valves in the built-in diaphragm pump.
Check for Leaks
1 Block off the sample gas outlet.
2 Apply a positive pressure of 100 mbar to the sample gas inlet.
3
Using a U-pipe manometer, for example (pipe diameter 7 to 8 mm), check
the drop in pressure; this must not exceed 0.1 mbar per minute.
4 Similarly, check for leaks from the other side.