Teledyne T100 Instruction Manual page 297

Teledyne ML - T100 UV Fluorescence SO2 Analyzer

Because the threads of the plastic screws are easily damaged it is highly recommended to use
new screws when reassembling the unit.

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.

Remove the end plate with the cooling fins (4 screws) and slide out the PMT cold block
assembly, which contains the TEC.

Unscrew the TEC from the cooling fins and the cold block and replace it with a new unit.
ATTENTION

Ensure to use thermal grease between TEC and cooling fins as well as between TEC and cold
block.

Align the side opening in the cold block with the hole in the PMT housing where the sample
Chamber attaches.

Evenly tighten the long mounting screws for good thermal conductivity.

Don't forget the gasket between HVPS and PMT.

Use new plastic screws to mount the PMT assembly on the PMT cold block.

Ensure that the O-ring is properly in place. Improperly placed O-rings will cause leaks, which
– in turn – cause moisture to condense on the inside of the cooler causing the HVPS to short
out.

Be sure to tighten these screws evenly.
9. Carefully take out the assembly consisting of the HVPS, the gasket and the PMT.
10. 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.
11. If the cold block or TEC is to be changed disconnect the TEC driver board from the
preamplifier board.
12. Re-assemble the TEC subassembly in reverse order.
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.
13. Re-insert the TEC subassembly. Ensure that the O-ring is placed properly and the
assembly is tightened evenly.
14. Re-insert the PMT/HVPS subassembly.
15. Insert the LED and thermistor into the cold block.
16. Replace the dessicant bags with five new desiccant bags.
17. Carefully replace the end plate.
18. Reconnect the cables and the reaction cell
19. Replace the sensor assembly into the chassis and fasten with four screws and
washers.
06807A(DCNxxxx)
COULD DAMAGE INSTRUMENT
Troubleshooting & Repair
297