Michell Instruments QMA401, User Manual

Page: 21 / 102

QMA401 User’s Manual
Michell Instruments 11
INSTALLATION
The couplings can be checked for leaks by pressurizing the system (by connecting the
sample line to the process) and introducing a proprietary leak test solution into each of
the test ports (6) located on the locking nut (7). If a stream of bubbles is produced then
the gasket seal is leaking. If no bubbles are produced, the seal is gas tight.
If a leak is detected, tighten up the locking nut (7) a little more until the leak stops. If
the leak cannot be stopped by tightening the coupling, unscrew the locking nut (7), and
remove the coupling from the instrument.
Examine the ends of the coupling to check that the surfaces are not damaged and then
fit a new gasket (8), re-connect and re-test.