Replacing The Pmt, Hvps Or Tec - Teledyne T200H User Manual

Troubleshooting & Service

7.6.5. REPLACING THE PMT, HVPS OR TEC

Although it is possible for a skilled technician to change the PMT or HVPS through the front panel
with the sensor assembly mounted to the analyzer, we recommend recommend turning off the
instrument, opening its top cover and removing the entire assembly and carry this procedure out on
a clean, anti-static table with the user wearing an anti-static wrist strap to prevent static discharge
damage to the assembly or its circuits.
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
http://www.teledyne-api.com
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The photo multiplier tube (PMT) should last for the lifetime of the analyzer. However,
in some cases, the high voltage power supply (HVPS) or the thermo-electric cooler
(TEC) may fail. In case of PMT, HVPS or TEC failure, the sensor assembly needs to be
opened in order to change one of these components. Refer to Figure 7-18 for the
structure of the T200H/M sensor assembly and follow the steps below for replacement
of one of its components. We recommend to ensure that the PMT, HVPS or TEC
modules are, indeed, faulty to prevent unnecessary opening of the sensor.
under Help Center > Product Manuals in the Special Manuals section
1. Power down the analyzer and disconnect the power cord.
2. Remove the cover and disconnect all pneumatic and electrical connections from the
sensor assembly.
3. 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 PMT cold block is to
be removed.
This step is not necessary if the HVPS or the PMT only are exchanged.
Teledyne API - Model T200H/T200M Operation Manual
CAUTION!
07270D DCN7141