7. Troubleshooting
Table 7 – Troubleshoot List
Ensure calibration system is functioning correctly
and is leak free.
Ensure sufficient gas is available for instrument and
an adequate vent is available for excess gas.
A leak in the instrument or calibration system dilutes
the sample stream and causes low span readings and
noise.
TE cooler, reaction cell
heater or converter heater
A failed temperature control allows the instrument
to drift with ambient temperature. Verify that the
cell temperature is 50C 3C and that the TE cooler
is 13°C 2°C and that the converter temperature is
325°C 5°C.
Faulty optical bench component.
1. Leak check (repair any leaks).
2. Background Port flow too high >130cc/min.
Service instrument.
3. PMT voltage too low less than 640V.
4 Optical filter in reaction cell contaminated requires
cleaning.
Cell pressure too high
(>280 torr)
1. Leak check (repair any leaks).
2. Replace external pump.
3. Background Port flow too high >130cc/min.
Service instrument.
4. Recalibrate pressure sensors.
PMT temperature too high
(>15°C)
1. Check optical bench heat sink fan is operating.
2. Check PMT cooler is operational, and correct
amount of thermal paste is applied.
Ensure Ozone Generator is on in the service menu. If
the generator will not turn on check converter
temperature and vacuum readings. Once the ozone
generator is on check that 12 volts is supplied to the
generator connector. If 12 volts are being supplied to
the generator try substitute ozone generator with
known working generator. If the instrument now
works replace ozone generator.
Faulty heater or
temperature sensor
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