
Model 400E Ozone Analyzer
Instruction Manual
MAINTENANCE SCHEDULE & PROCEDURES
P/N 04316 Rev: B
211
9.3.4.
Performing Leak Checks
Leaks are the most common cause of analyzer malfunction; Section 9.3.4.1
presents a simple leak check procedure. Section 9.3.4.2 details a more thorough
procedure.
9.3.4.1.
Vacuum Leak Check and Pump Check
This method is easy and fast. It detects, but does not locate most leaks, it also
verifies that the sample pump is in good condition.
1.
Turn the analyzer ON, and allow enough time for flows to stabilize.
2.
Cap the sample inlet port.
3.
After 2 minutes, when the pressures have stabilized, note the SAMP FL and
PRES test function readings on the front panel.
4.
If SAMP FL < 10 CC/M then the analyzer is free of any large leaks.
5.
If PRES < 10 IN-HG-A then the sample pump diaphragm is in good condition.