Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 195)

IM 11M12D01-01E 11-1
11. Inspection and Maintenance
11. Inspection and Maintenance
This chapter describes the inspection and maintenance procedures that are performed to
maintain reliable performance of the AV550G Averaging Converter and to keep it in
good operating condition. The procedure for adding channel cards is also explained in
this chapter.
DANGER
Do NOT touch the probe if it has been in operation immediately just before being
checked. (The sensor at the tip of the probe heats up to 750
ЊC during operation. If you
touch it, you will get burned.)
WARNING
When checking the detector, carefully observe the following:
(1) Do not subject the probe to shock or cool it rapidly.
The sensor is made of ceramic (zirconia). If the detector is dropped or bumped into
something, the sensor may be damaged and no longer work.
(2) Do not reuse a metal O-ring to seal the cell assembly. If you replace the cell or
remove it from the probe for checking, be sure to replace the metal O-ring. Other-
wise, the furnace gas may leak, and then the leaking corrosive gas will cause the
built-in heater or thermocouple to go open circuit, or the detector may corrode.
(3) Handle the probe with care so that the dust-filter mounted screws on the tip of the
probe do not hurt your finger(s).
(4) Before opening or closing the terminal box, first remove dust, sand, or the like from
the terminal box cover.