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Instrument Maintenance T400 Ozone Analyzer Operator’s Manual
234
11.3.6. PERFORMING A SAMPLE FLOW CHECK
Note Always use a separate calibrated flow meter capable of measuring flows
in the 0 – 1000 cc/min range to measure the gas flow rate though the
analyzer. DO NOT use the built in flow measurement viewable from the
Front Panel of the instrument. This measurement is only for detecting
major flow interruptions such as clogged or plugged gas lines. See rear
panel for sample port location.
1. Turn off power.
2. Attach the flow meter to the sample inlet port on the rear panel. Ensure that the
inlet to the Flow Meter is at atmospheric pressure.
3. Turn on instrument power.
4. Sample flow should be 800 cc/min 10%.
Low flows indicate blockage somewhere in the pneumatic pathway. High flows indicate
leaks downstream of the Flow Control Assembly.
Once an accurate measurement has been recorded by the method described above, adjust
the analyzer’s internal flow sensors by following the procedure described in
Section9.5.2.
06870C DCN6332