Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 133)

<11.Inspection and Maintenance>
11-4
IM 11M12A01-04E
F11.3E.ai
Dust filter
(optional) Bolts (four)
Washers
(four)
Sensor (cell)
U-shaped pipe
Metal O-ring
Contact
Probe
1/8 turn – tighten bolts 1/8 turn
(approximately 45°) each
U-shaped pipe
support
Screw
Filter
Figure 11.3 Exploded View of Sensor Assembly
CAUTION
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 Assembly
This section describes the replacement procedure for the heater assembly.
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 assembly reaches high temperatures
and is subjected to high voltages.
So, maintenance services should be performed after the power is off and the heater assembly
temperature has returned to normal room temperature.
For details, refer to IM11M12A01-21E “ Heater Assembly “.
NOTE
If the heater assembly can not be removed because a screw has fused to its thread, one of our
service representatives can fix it.