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<11.Inspection and Maintenance>
11-8
IM 11M13A01-04E
Flame Arrestor Assembly
Detector
Apply adhesive here
Flame Arrestor Assembly
Detector
F11-5E.ai
Figure 11.5 Removal of Flame Arrestor
11.1.5 Replacement of O-ring
The detector uses three different types of O-rings 14 , 21 , and
22
.
Two O-ring of each type.
11.1.6 Stopping and Re-starting Operation
<Stopping Operation>
When operation is stopped, take care of the followings so that the sensor of the detector cannot
become unused.
CAUTION
When operating an instrument such as boiler or industrial furnace is stopped with the zirconia oxygen
analyzer operation, moisture can condensate on the sensor portion and dusts may stick to it.
If operation is restarted in this condition, the sensor which is heated up to 750°C may become
permanently contaminated. Consequently, the dusts can make the sensor performance very lower. If
a large amount of water is condensed, the sensor can be broken and never be used.
To prevent the above nonconformity, take the following action when stopping operation.
(1) If possible, keep on supplying the power to converter and flowing reference gas to the sensor.
If impossible to do the above, remove the detector.
(2) If unavoidably impossible to supply the power and removing the detector, keep on flowing air at
600 ml/min into the calibration gas pipe.
<Restarting Operation>
When restarting operation, be sure to flow air, for 5-10 minutes, at 600 ml/min into the calibration gas
pipe before supplying the power to converter.