Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 156)

IM 11M12A01-05E 11-5
11. Inspection and Maintenance
F11.3E.EPS
Sensor
Metal O-ring
Contact
Probe
Bolts (four)
Washers
(four)
U-shaped pipe
1/8 turn — tighten bolts 1/8 turn
(approximately 458) 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 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 detail, 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.