< 4. Piping >
4-9
IM 11M12D01-01E
CAUTION
• This is to lower the temperature of a sample gas below 700°C. When both the temperature and
the pressure of a sample gas are high, the temperature of the sample gas may not fall below
700°C before the gas reaches the detector. On the other hand, the temperature of a sample gas
may drop too much and thus condensation develops in the high temperature probe adapter.
During wintertime, it is recommended that the high temperature probe adapter be protected with
an insulating material to prevent condensation.
• If optional 24 V outputs are specified for solenoid valves (Option Code “/24”), no external
power supply for solenoid valve is required. The solenoid valves are powered from the AV550G
Averaging Converter. Never connect external power sources in the wiring for solenoid valves.
• When a high temperature detector is used and blow back is required to eliminate dust
accumulating in the probe of the high temperature probe adapter, air supply piping for purging
should be installed.
CAUTION
If a sample gas contains much dust (e.g., in recovery boilers or cement kilns), the probe is more likely
to become clogged. To eliminate this dust accumulation using air pressure, piping is generally installed
from an air source only when cleaning is performed. Some cases, however, may need a permanent
installation of the blow back piping. See Subsection 4.1.5 for the installation of blow back piping.
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