Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 74)

IM 11M13A01-02E 4-5
4. Piping
4.1.5 Piping to the High-temperature Probe Adapter
• The measured gas should be at a temperature below 700
Њ C before reaching the
detector sensor.
If the gas is under negative pressure, it should be fed to the detector by suction.
• For usage of the probe adapter when using high-temperature detector, refer to Section
3.2.2.
• If the measured gas is under negative pressure, connect the auxiliary ejector
(E7046EC/E7046EN) as illustrated in Figure 4.3. Mount the pressure gauge as close
as possible to the auxiliary ejector. However, if the ambient temperature is too high,
mount the gauge in a location with a temperature below 40
Њ C.
Auxiliary ejector for
high temperature use
Adapter for
high temperature probe
Detector
F4.3E.EPS
Figure 4.3 Mounting the auxiliary ejector
If the temperature of the measured gas exceeds the specified value and its pressure
exceeds 0.49 kPa, the sample gas temperature may not be below 700
Њ C at the detector.
In such a case, connect a needle valve (found on the open market) through a nipple (also
found on the open market) to the probe adapter sample gas exhaust (Rc1/2) so that the
sample gas exhaust volume is restricted.
Reducing nipple
(R1/2-R1/4 or R1/2-1/4NPT)
Needle valve
F4.4E.EPS
Figure 4.4 Mounting the needle valve for restricting exhaust flow of the sample
gas