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Maintenance Schedule & Procedures M400E Ozone Analyzer Operator’s Manual
12.3.5. 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 Figure 3-2, Figure 3-3 and Figure 5-4 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.
226 04315 Rev. C1