Teledyne 501 TRS, Operation Manual, Page: 83 / 111

Teledyne API - T102/501 TRS, Addendum to T101 Operation Manual TROUBLESHOOTING and REPAIR
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11.5.6.
Replacing the Thermocouple
Continuous operation at high temperatures will eventually degrade the performance of
the thermocouple used to sense the temperature of the quartz oven. The following
instructions provide the necessary information to remove the existing thermocouple
from the Converter Heater Block and install the replacement thermocouple supplied in
KIT000255 (AKIT, Retrofit, M501TS, TC Type S RPLCMN), which you must obtain
from TAPI.
NOTE:
The Type S thermocouple has a red wire and a black wire. If you have any other wire
colors, please call Sales for the correct part.
To get started, you will need the following tools:
• Nutdriver, 5/16
•
Nutdriver, 11/32
• Diagonal Cutter
•
Philips head Screwdriver #2
CAUTION
THE CONVERTER TUBE AND HEATER ARE VERY HOT
DO NOT TOUCH WHILE THE M501-TRS IS OPERATING NOR UNTIL
IT HAS COOLED TO ROOM TEMPERATURE AFTER POWERING OFF
THE M501-TRS.
1. Turn off and remove all power to the M501TS Converter and allow it to
cool to room temperature before continuing with this replacement
procedure. This may take 30 minutes or more.
2. Remove the cover from the Converter chassis.
3. Unscrew the (4) nuts that secure the front panel to the chassis. They are
located just behind the Front Panel along the top.
4. Lower the Front Panel to gain easier access to the end of the quartz tube.
5. Unscrew the (3) nuts that secure the Heater cover that protects the
Heater Block and quartz tube. Remove this cover.
6. Cut the tie-wrap that secures the thermocouple to the fitting at the end
of the quartz tube.
7. Loosen the Teflon fitting at the end of the quartz tube taking care not to
put any stress on the tube and slide the fitting off the tube.
8. Remove the thermocouple.
9. Disconnect the thermocouple wires from the Temperature Controller.
07267B DCN6485