Advertisement
Servicing
PMT Cooler and Reaction Chamber Assembly Replacement
7-16
Model 42i Trace Level Instruction Manual
Captive Screws (4)
(Two Not Shown)
Figure 7–7. PMT Cooler and Reaction Chamber
5. Disconnect plumbing connections from the reaction chamber.
6. Disconnect the cables from the PMT high voltage power supply, the
input board, and the measurement interface board. Remove all tie-
wraps securing the cables.
7. Loosen four captive screws holding cooler to floor plate and remove the
cooler assembly with the reaction chamber.
Note If only the cooler is being replaced, remove the PMT and reaction
chamber from the old cooler and install them on the new cooler.
8. Install new cooler by following previous steps in reverse.
Fasten knurled fittings on reaction chamber finger tight.
Make sure that the heat shrink covered tubing between the reaction
chamber and the converter is light tight at the connections.
Temperature Control Board
Cooler Shroud
Reaction Chamber
To COOLER on Measurement
Interface Board
To PMT HVPS
BNC Connector to Input Board
▲
To BENCH on
Temp. Control Board
▲
▲
Thermo Fisher Scientific
Advertisement
Troubleshooting
