Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 64)

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4-4
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
If the temperature of the sample gas exceeds the specified value and its pressure exceeds 0.49 k
Pa, the sample gas temperature may not be below 700 °C at the detector.
In such a case, connect a needle valve (found on the local market) through a nipple (also found
on the local market) to the probe adapter sample gas exhaust (Rc 1/2) so that the sample gas
exhaust volume is restricted.
Reducing nipple
(R1/2-R1/4 or R1/2-1/4NTP)
Needle valve
F4-4E.ai
Figure 4.4 Mounting the needle valve for restricting exhaust flow of the sample gas
In cases where condensation is likely to occur in the probe adapter when the sample gas is
cooled, protect the probe adapter with an insulating material as illustrated in Figure 4.5.
Sample gas outlet
Cover flange
Adapter for high temperature probe
Detector
Insulating material
Probe
F4-5E.ai
Figure 4.5 Preventing to condensation
If the sample gas is to be vented at a distance from the detector because no reference gas piping
can be provided, an exhaust pipe should be installed as illustrated in Figure 4.6.
In addition, the exhaust pipe shall be kept warm to protect against condensation.
Exhaust pipe
Rc1/2
Use thick piping for exhaust.
Horizontal part should be kept to the
minimum to maintain piping strength.
F4-6E.ai
Figure 4.6 Exhaust pipe