
Teledyne API - Model T200H/T200M Operation Manual
Troubleshooting & Service
233
•
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 7.5.18.
•
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 produces 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 concentration 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.
•
Confirm that the NO
x
span gas source is accurate. This can be done by comparing
the source with another calibrated analyzer, or by having the NO
x
source verified by
an independent traceable photometer.
07270D DCN7141
Содержание T200H
Страница 2: ......
Страница 4: ...Teledyne API Model T200H T200M Operation Manual ii This page intentionally left blank 07270D DCN7141 ...
Страница 8: ...Teledyne API Model T200H T200M Operation Manual vi This page intentionally left blank 07270D DCN7141 ...
Страница 10: ...Teledyne API Model T200H T200M Operation Manual viii This page intentionally left blank 07270D DCN7141 ...
Страница 12: ...Teledyne API Model T200H T200M Operation Manual x This page intentionally left blank 07270D DCN7141 ...
Страница 344: ...This page intentionally left blank B 2 07270D DCN7141 ...
Страница 353: ...APPENDIX D 07270D DCN7141 07270D DCN7141 D 1 D 1 ...