Emerson Rosemount 700XA Reference Manual page 87

July 2020
c) Remove the PTFE seals as well as the thermistor and its wires from the retainer nut.
d) Remove the PTFE shields from the old thermistor wires and install on the new thermistor wires.
e) Insert a new PTFE seal into the TCD block.
f) Thread the thermistor through the retainer nut.
g) Screw the retainer nut back into the TCD block.
Ensure a tight fit (quarter turn after finger tight); otherwise a potential leak path might open.
h) Reconnect the thermistor leads to the termination block, taking care to reconnect the thermistor leads to the
corresponding terminal block screws.
Note
The thermistors are a matched pair (2-5-1611-003) and must be replaced as such. Repeat
pair.
Note
Tighten the block screws with a torque wrench to 20 in.-oz.
7. Reconnect the gas tubings.
Make sure tubing is properly seated and reattach the TCD housing with the four screws.
8. Replace the thermal cover and explosion-proof dome.
9. Apply power to the GC.
Remove the flame ionization detector (FID)
The FID has no replaceable parts. If it has damage (such as as broken resistance temperature device [RTD] or igniter coil) you will
need to remove and replace the FID.
WARNING
EXPLOSION HAZARD
Failure to de-energize the analyzer may cause serious injury or death to personnel.
Do not open when energized or when an explosive atmosphere may be present.
Keep cover tight while circuits are live.
Rosemount 700XA
Step 6 for each thermistor in a
87