17
INSTALLATION OF STRAINER COVER MOUNTED THERMOWELLS (CONT.)
RTD INSTALLED IN THERMOWELL
q The aluminum thermowell will be
used for the 3-wire platinum RTD
temperature probe.
q Before inserting the probe into the
aluminum thermowell, thoroughly
coat the entire probe length with the
copper, heat transfer grease that is
supplied.
q Insert, then remove, the probe from
the thermowell. Re-coat the end of
the RTD with the heat transfer
grease. Repeat the
insertion/removal process 2 or 3
times. This will provide a uniform
coating inside the thermowell that
ensures the proper heat transfer
from the liquid to the probe inside
the thermowell.
q The kit includes four foam washers
and a slotted metal disc. Slide the
foam washers down the RTD wires
and position them at the tail end of
the RTD.
q Re-coat the RTD probe and insert it
into the thermowell for the final time.
Position it as far down in the
thermowell as possible.
q The foam washers should “bottom
out” inside the hex nut body of the
thermowell. The disc should be
positioned on top of the foam
washers with the RTD wires running
through its slot.
q Next, feed the RTD wires through
the explosion proof union. Thread
the male ½ NPT side of the union
into the thermowell until the union
contacts the disc and compresses
the foam washers. The number of
washers can be added or subtracted
to provide an optimum fit.
q The slotted disk will prevent the RTD
from being removed from the
thermowell, without removing the
union. After attaching the conduit,
the union should be sealed with the
seal wire kit.
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