Caution, 3 replacement of the heater unit – Yokogawa Integral Oxygen Analyzer ZR202 User Manual

Page 147

Advertising
background image

IM 11M13A01-04E

11-5

11.

Inspection and Maintenance

F11.3E.EPS

Flame arrestor
assembly

Bolts (four)

Washers
(four)

Sensor

U-shaped pipe

Filter

Metal O-ring

Contact

Probe

1/8 turn – tighten bolts 1/8 turn
(approximately 45

Њ

) each

U-shaped pipe
support

Screw

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 ".

Advertising