Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 177)

IM 11M12A01-03E 11-5
11. Inspection and Maintenance
F11.3E.EPS
Bolts (four)
Washers
(four)
U-shaped pipe
1/8 turn — tighten bolts 1/8 turn
(approximately 45
Њ ) each
U-shaped pipe
support
Sensor
Metal O-ring
Contact
Probe
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 details, refer to IM11M12A01-21E " Heater Assembly ".
CAUTION
If the heater strut assembly can not be removed because a screw hes fused to its thread,
one of our service representatives can fix it.