Instruction manual

11.0 INSPECTION and MAINTENANCE SM425 INSTRUCTION MANUAL
Figure 11-2 Installing the Contact
2. Make sure the O-ring groove on the flange surface of the sensor is clean. Install the metal O-ring
in the O-ring groove and then insert the sensor in the probe while turning it clockwise. When the
metal O-ring comes in contact with the probe’s surface, align the bolt openings and the U-
shaped-pipe insertion hole.
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 install them with washers. Tighten the
four bolts evenly by hand. Use a torque wrench to tighten the bolts 1/8 turn at a time to 5.9 Nm
using a criss-cross pattern. If they are not uniformly tightened, the O-ring may not seal properly
and the sensor or heater may be damaged.
Replacement of the sensor assembly is now complete. Install the detector probe and restart operation.
Calibrate the instrument before making a measurement.
Figure 11-3 Exploded View of Sensor Assembly
42500001 REV A 177