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7.
Inspection and Maintenance
7.1 Sensor
7.2 Converter
7.3 Sampling Unit (Optional)
IM 11M10A01-03E
This chapter explains inspections to ensure best performance and operations of the
OX102 oxygen analyzer.
If repair is required, this equipment will need to be returned to the factory. Contact your
Yokogawa representative.
NOTE
• Do not touch the sensor head accidentally while the sensor is hot right after removing
it from the process. The sensor can be as hot as 700 C. This can cause severe burns.
• The sensor contains components made from ceramics (zirconia). Physical damage by
dropping or jolting can result in sensor failure.
(1) The sensor is of limited life, and its service life varies depending on operating
conditions. When the sensor cannot be calibrated, it should be replaced.
(2) After replacement, the sensor parameters specified in the Sensor Parameter Table
(Figure 5.1) of a new sensor must be entered following the procedure described in
Section 6.3 (1) "Configuring the sensor parameters."
(3) If the slots of the sensor head get clogged, it may cause false measurement. When
clogging becomes severe enough to block the gas flow, clean the slots with a brush
and subsequently by applying pressurized air (300 kPa max.) to the sensor while
keeping the sensor head facing downward to prevent dust from getting into the inside
of the sensor.
The fuse is mounted on a printed board inside the converter. If no display appears after
applying power, the fuse needs to be replaced. Contact our service station for fuse
replacement.
The sampling unit is used to eliminate organic solvents using a built-in activated carbon
filter, when the sample gas contains a small amount of organic solvents.
When this sampling unit is used with OX100 series Oxygen Analyzer, if the sampling
unit is not properly maintained the life of the Oxygen Analyzer sensor will be adversely
affected, drift will occur or the instrument will not calibrate.
Frequent filter maintenance is particularly important. If zero or span need frequent
adjustment, check the filter first.
(1) When the sample gas contains 500 ppm of isopropyl alcohol and flows at 500 ml/
min, the expected life of the activated carbon filter element is approximately 50
hours. After 50 hours service, the activated carbon filter element must be replaced.
Using expired carbon filter may result in false measurement, or even sensor deterio-
ration.
7. Inspection and Maintenance
7-1
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