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<7. INSPECTION AND MAINTENANCE>
7-4
IM 11M03A02-00E
3. Part assembly procedure
(1) First, install the contact. Being careful not to cause irregularities in the pitch of the coil spirals
(i.e., not to bend the coil out of shape), place it in the ringed groove properly so that it forms
a solid contact.
Groove in which the contact
(E7042BS) is placed
F7.2E.ai
Figure 7.2 Installing the Contact
(2) Next, make sure that the O-ring groove on the flange surface of the sensor is clean. Install
the metal O-ring in that O-ring groove, and then insert the sensor in the probe while turning
it clockwise. After inserting it until the metal O-ring comes in contact with the probe’s O-ring
contact surface, properly align the U-shaped-pipe insertion holes with the bolt openings.
(3) Attach the U-shaped pipe to its support with filter, then fully insert the U-shaped pipe and its
support into the probe.
(4) Coat the threads of the four bolts with antiseize grease and then screw them in along with
the washers. First, tighten the four bolts uniformly by hand, and then use a torque wrench
to tighten all areas of the metal O-ring uniformly, that is, to make sure the sensor flange is
perfectly horizontal to the O-ring’s working face in the probe. This is done by tightening first
one bolt and then its opposing bolt each 1/8 turn, and then one of the other bolts followed by
its opposing bolt, each also 1/8 turn. This continues in rotating fashion until they are all fully
tightened with the torque wrench preset to approximately 5.9 N • m. If they are not uniformly
tightened, the sensor or heater may be damaged.
Replacement of the sensor assembly is now complete. Install the detector and restart
operation. Calibrate the instrument before making a measurement.