Teledyne T200 User Manual page 174

12. Carefully take out the assembly consisting of the HVPS, the insulation gasket
and the PMT.
13. Change the PMT or the HVPS or both, clean the PMT glass tube with a clean,
anti-static wipe and do not touch it after cleaning.
14. If the cold block or TEC is to be changed:
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•
15. Remove the end plate with the cooling fins (4 screws) and slide out the PMT
cold block assembly, which contains the TEC.
16. Unscrew the TEC from the cooling fins and the cold block and replace it with a
new unit.
17. Reassemble this TEC subassembly in reverse order.
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•
18. Reinsert the TEC subassembly in reverse order.
•
19. Insert the O-Test LED and thermistor into the cold block, insert new desiccant
bags and carefully replace the end plate by making sure that the O-ring is
properly in place.
•
20. Reinsert the PMT/HVPS subassembly in reverse order.
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•
21. Install new silica gel packets (desiccant bags).
22. Reconnect the cables and the reaction cell (evenly tighten these screws).
23. Replace the sensor assembly into the chassis and fasten with four screws and
washers.
172 Teledyne API T200 NO/NO
Disconnect the TEC driver board from the preamplifier board, remove the
cooler fan duct (4 screws on its side) including the driver board.
Disconnect the driver board from the TEC and set the sub-assembly aside.
Ensure to use thermal grease between TEC and cooling fins as well as
between TEC and cold block and that the side opening in the cold block will
face the reaction cell when assembled.
Evenly tighten the long mounting screws for good thermal conductivity.
CAUTION – QUALIFIED PERSONNEL
The thermo-electric cooler needs to be mounted flat to the
heat sink.
If there is any significant gap, the TEC might burn out. Ensure
to apply heat sink paste before mounting it and tighten the
screws evenly and cross-wise.
Ensure that the O-ring is seated properly and the assembly is tightened
evenly.
Improperly placed O-rings will cause leaks, which – in turn – cause moisture
to condense on the inside of the cooler and likely cause a short in the HVPS.
Don't forget the insulation gasket between HVPS and PMT.
Use new plastic screws to mount the PMT assembly on the PMT cold block.
/NO Analyzer with NumaView™ Software
2 x
083730200A DCN7962