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Model 400E Ozone Analyzer
Instruction Manual
3. Confirm the Sample Pressure, Sample Temperature, and Sample Flow readings
are correct and have steady readings.
4. Verify that the sample filter element is clean and does not need to be replaced.
11.3.3. Inability To Span – No Span Key
1. Confirm that the O
inter-comparing the source with another calibrated monitor, or having the O
source verified by an independent traceable photometer.
2. Check for leaks in the pneumatic systems as described in Section 9.3.4.
3. Make sure that the expected Span Gas Concentration entered into the
instrument during calibration is not too different from expected span value.
4. Check to make sure that there is no ambient air or Zero Air leaking into Span
Gas line.
11.3.4. Inability to Zero – No Zero Key
1. Confirm that there is a good source of zero air. If the IZS option is installed,
compare the zero reading from the IZS zero air source to the calibration zero air
source.
2. Check for leaks in the pneumatic systems as described in Section 9.3.4.
3. Check to make sure that there is no ambient air leaking into Zero Air line.
11.4. Other Performance Problems
Dynamic problems (i.e. problems which only manifest themselves when the
analyzer is monitoring sample gas) can be the most difficult and time consuming to
isolate and resolve. The following section provides an itemized list of the most
common dynamic problems with recommended troubleshooting checks and
corrective actions.
11.4.1. Temperature Problems
Individual control loops are used to maintain the set point of the UV Lamp, IZS
Ozone Generator (Optional), and Metal Wool Scrubber (Optional) temperatures. If
any of these temperatures are out of range or are poorly controlled, the M400E will
perform poorly.
P/N 04316 Rev: B
TROUBLESHOOTING & REPAIR PROCEDURES
span gas source is accurate. This can be done by
3
3
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