YOKOGAWA EXAxt ZR22G, User Manual, Page: 175 / 211

<11. Inspection and Maintenance>
11-4
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
F11.3E.ai
Dust filter
(optional)
Bolts (four)
Washers
(four)
Sensor
U-shaped pipe
Filter
Metal O-ring
Contact
Probe
1/8 turn – tighten bolts 1/8 turn
(approximately 45°) each
U-shaped pipe
support
Figure 11.3 Exploded View of Sensor Assembly
NOTE
Optional Inconel bolts have a high coefficient of expansion. If excess torque is applied while the
bolts are being tightened, abnormal strain or bolt breakage may result.
So, tighten the bolts following the instructions given above.
11.1.3 Replacement of the Heater Unit
This section describes the replacement procedure for the heater unit.
The sensor or ceramic heater-furnace core internal structure is subject to fracturing, so do NOT
subject it to strong vibrations or shock. Additionally, the heater unit reaches high temperatures
and is subjected to high voltages. So, maintenance services should be performed after the power
is off and the heater unit temperature has returned to normal room temperature.
For details, refer to IM11M12A01-21E “Heater Assembly“.
NOTE
If the heater strut assembly can not be removed because a screw has fused to its thread, one of
our service representatives can fix it.