Tech Note: Unreleased
Date: October 22, 2013
each air cap’s lower groove (20). Insert the caps (20) into the air connector (13),
do not push them in all of the way. Push the caps in just so far that the bottoms
of the top grooves are flush with the surrounding surface. Slide the plate (17) into
place between the grooves in the caps and tighten the screw (25) that
connects the plate to the air connector by twisting it clockwise. Make sure the
screw (19) and its holder (18) are secured to the plate before proceeding.
Heater Strut and Air Connector Installation
It is easiest to place replace the contact spring (9) at this step by using tweezers
or a pick to place it in the inner-most groove at the top of the heater. Slide the
heater strut (23) into the probe tubing (24), guiding the calibration tube through
the hole in the tip of the heater and holes on the strut. Be careful not to twist or
force the heater strut into the probe or damage to the calibration tubing may
occur. Once the heater is fully inserted, flip the heater over, add high-
temperature anti-seize grease to the contactor nut (8) and install it in the tip of
the probe by twisting special service tool M1234HD-A clockwise using a
screwdriver in its end to tighten it (technically, this should be torqued to 106 inch-
pounds, but this is not too critical, just make sure it is snug). Now, flip the probe
back over and feed the wires of the probe through the large air connector (13)
opening. The side with the two small holes should be going down on the probe
where the calibration tubes will seat themselves into the air connector. Tighten
the plate screw (19) fully by turning it clockwise into the hole at the end of the
heater strut until the air connector (13) cannot move. Replace the o-ring (14) on
the top of the air connector’s surface. Make sure to replace the sleeve (12) if it
was removed with its notched side facing the air connector. The junction box
(16) may now be fitted to the top of the air connector (13), carefully feeding the
probe wires through the junction box. Reattach the four sets of bolts (10) and
washers (11) through the small probe flange to connect the junction box (16)
and air connector (13) to the probe. Slide the bolt cover (12) back up the probe
with the cutout portion on the air connector’s port holes and secure it by turning
the two screws (15) clockwise into the air connector. Replace the heater wires
on the lower terminal block (27) using screws (31) at terminals seven and eight
(no need to pay attention to polarity). The upper terminal block (26) may now
be re-installed using screws (28) with spacers (29) in the upper-left and lower-
right corners. Ensure that the (-) CELL wire at terminal two is bridged to the
upper-left screw, also ensure that the RJC (30) body is grounded at the lower-
right screw. Using screws (31), attach the (+) CELL wire on the terminal one on
the upper terminal block (26), attach the sheathed (+) TC wire at terminal three,