3 replacement of the heater unit, Inspection and maintenance of the converter -9, Caution – Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 User Manual

Page 177

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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.

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