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Teledyne API - Model T200H/T200M Operation Manual Troubleshooting & Repair
235
Check if the ozone generator is turned on. Usually, the analyzer issues a warning
whenever the ozone generator is turned off. Go to SETUP-MORE-DIAG-ENTR,
then scroll to the OZONE GEN OVERRIDE and see if it shows ON. If it shows
OFF, turn it ON and EXIT the DIAG menu. If this is done and the ozone flow is
correct, the analyzer should be properly supplied with ozone unless the generator
itself is broken. A more detailed description of the ozone generator subsystem
checks are in Section 11.5.17.
Confirm the lack of response by supplying NO or NO
2
span gas of about 80% of the
range value to the analyzer.
Check the sample flow and ozone flow rates for proper values.
Check for disconnected cables to the sensor module.
Carry out an electrical test with the ELECTRICAL TEST procedure in the
diagnostics menu, see Section 4.13.7.3. If this test produ
ces a concentration
reading, the analyzer’s electronic signal path is correct.
Carry out an optical test using the OPTIC TEST procedure in the diagnostics menu,
see Section 4.13.7.2. If this test results in a co
ncentration signal, then the PMT
sensor and the electronic signal path are operating properly. If the T200H/M
passes both ETEST and OTEST, the instrument is capable of detecting light and
processing the signal to produce a reading. Therefore, the problem must be in the
pneumatics or the ozone generator.
If NO
2
signal is zero while NO signal is correct, check the NO/NO
X
valve and the
NO
2
converter for proper operation.
7.3.3. UNSTABLE ZERO AND SPAN
Leaks in the T200H/M or in the external gas supply and vacuum systems are the most
common source of unstable and non-repeatable concentration readings.
Check for leaks in the pneumatic systems as described in Section 7.5. Consider
pneumatic components in the gas delivery system outside the T200H/M such as a
change in zero air source (ambient air leaking into zero air line or a worn-out zero
air scrubber) or a change in the span gas concentration due to zero air or ambient
air leaking into the span gas line.
Once the instrument passes a leak check, do a flow check (this Section) to make
sure that the instrument is supplied with adequate sample and ozone air.
Confirm the sample pressure, sample temperature, and sample flow readings are
correct and steady.
Verify that the sample filter element is clean and does not need to be replaced.
7.3.4. INABILITY TO SPAN - NO SPAN BUTTON
In general, the T200H/M will not display certain keyboard choices whenever the actual
value of a parameter is outside of the expected range for that parameter. If the
calibration menu does not show a SPAN key when carrying out a span calibration, the
actual concentration must be outside of the range of the expected span gas concentration,
which can have several reasons.
Verify that the expected concentration is set properly to the actual span gas
concentration in the CONC sub-menu.
07270B DCN6512