Installation and Start-Up | 3-39
5. Block in the instrument air by closing the Drive Air Isolation Valve and
observe the pressure reading. Allow the pressure within the sample
system and Measuring Cell to equilibrate (approximately 5 minutes)
before taking the initial reading. Meanwhile, continue to observe the
CellP reading. If the reading drops less than 10 mmHg (0.39 "Hg) in
4–5 minutes, the system is sufficiently leak-tight.
However, if the reading steadily decreases, there is a leak somewhere
in the system.
6. If there is a leak, use a suitable detergent-based leak detection fluid
(e.g. Snoop
®
) to leak check all of the other fittings except those that
are hot, such as those on the Measuring Cell. To test the zones that
are hot, observe the CellP reading and check for steady or decreasing
values.
Do not use a leak detection fluid on hot fittings. If the analyzer system
is at operating temperature, the temperature zone circuitry fuses must
be opened to allow the temperature zones to cool down before using a
leak detection fluid on the fittings.
If the Measuring Cell is suspect, check all fittings to ensure they are
tight and repeat the procedures of testing/repairing/testing until all
leaks have been eliminated.
7. After the analyzer has passed the pressure leak test, open the Vent
Valve and then the Sample Valve on the ASR900 Sample Probe.
The procedure is complete and the analyzer is ready to analyze sample
gas.
!
CAUTION
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