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Troubleshooting & Repair
This is the entry to the PMT Exchange
PMT Output
Connector
PMT Power Supply
& Aux. Signal
Connector
Both may be coated with a white, thermal conducting paste. Do not contaminate the inside of
the housing or the PMT tube with this grease.
296
PMT Housing End Plate
PMT Preamp PCA
Insulation Gasket
PMT Temperature
Sensor
Figure 10-16: PMT Assembly - Exploded View
To replace the PMT, the HVPS or the TEC:
1. Remove the sensor module as described in Section 10.7.2.1.
2. Remove the entire sensor module assembly from the.
3. Remove the reaction cell assembly.
4. Remove the two connectors on the PMT housing end plate facing towards the front
panel.
5. Remove the end plate itself (4 screws with plastic washers).
6. Remove the desiccant bags inside the PMT housing.
7. Along with the plate, slide out the OPTIC TEST LED and the thermistor that
measures the PMT temperature.
8. Unscrew the PMT assembly. It is held to the cold block by two plastic screws.
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
High voltage Power Supply
(HVPS)
PMT
O-Test LED
Light from Reaction
Chamber shines
through hole in side
of Cold Block
Thermo-Electric Cooler
(TEC)
PMT Heat Exchange Fins
TEC Driver PCA
06807A(DCNxxxx)
PMT Cold Block
Connector to PMT
Pre Amp PCA
12V Power
Connector
Cooling Fan
Housing
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