Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 74)

5 Maintenance Model 2020
5-8 Teledyne Analytical Instruments
c. Turn the uncovered Cell Block assembly over so that the
bottom faces you. The black rectangular block with four screws
is the Heater Block.
d. The Heater is fastened to the Heater Block by a set screw as
well as the silicone sealing compound. The Thermistor is
fastened only by the silicone sealer.
(1) To remove the Heater, use a 1 / 16
″
Allen wrench to loosen
the Thermistor set screw. Then, grasp BOTH Heater wires
firmly, and pull the Heater slowly out of the Heater Block,
breaking the silicone seal. Do not allow any foreign matter
to enter the empty duct.
(2) To remove the Thermistor, grasp BOTH Thermistor wires
firmly, and pull the Thermistor slowly out of the Heater
Block, breaking the silicone seal. Do not allow any foreign
matter to enter the empty duct.
e. Undo the cable lacing and separate the Heater/Thermistor wires.
Then, disconnect the wires from TS1 on the Temperature
Control Board. (See Figures 5-4 and 5-7.)
5.6.4 Replacing the Heater and/or Thermocouple
a. To replace the Heater and/or Thermocouple, coat the new
element with silicone sealing compound, and insert it into the
duct.
CAUTION: The larger duct is for the Heater element, and the
smaller duct is for the Thermocouple.
b. Enough sealing compound should be on the element to spill
over and seal around the wire where it enters the duct. Smooth
the outer seal and remove any excess.
c. Reassemble the Cell Compartment by reversing the procedure
in section 5.6.3. Then replace the cabling.
d. Reinstall the Assembled Cell Compartment by reversing the
procedure in section 5.6.1. Then reconnect the wires to TS1 on
the Temperature Control board.