Replacing The Pmt, Hvps Or Tec - Teledyne T200 Operation Manual

Troubleshooting & Service

12.8.5. REPLACING THE PMT, HVPS OR TEC

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Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
The photo multiplier tube (PMT) should last for the lifetime of the analyzer, however,
the high voltage power supply (HVPS) or the thermo-electric cooler (TEC) components
may fail. Replacing any of these components requires opening the sensor module. This
is a delicate assembly and it is recommend that you ensure the PMT, HVPS or TEC
modules are, indeed, faulty before unnecessarily opening of the module.
While the PMT or HVPS can be removed through the front panel without un-
mounting the entire sensor module, we recommend turning off the instrument,
opening its top cover and removing the entire assembly so that further repairs can
be carried out at an anti-ESD workstation.
Follow the guidelines for preventing electrostatic damage to electronic
components, defined in the manual, Fundamentals of ESD, PN 04786, which can be
downloaded from our website at
Product Manuals in the Special Manuals section..
1. Turn OFF the analyzer and disconnect the power cord.
2. Remove the cover.
3. Disconnect all pneumatic and electrical connections from the sensor assembly.
4. Remove the sensor assembly.
5. If the TEC is to be replaced, remove the reaction cell assembly at this point by
unscrewing two holding screws.

This is necessary only if the repair being performed involves removing the PMT
cold block.
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