Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 70)

IM 11M12D01-01E 4-4
4.1.3 Piping for the Reference Gas
This piping is to be installed between the zero gas cylinder and the ZA8F flow setting
unit, and between the ZA8F flow setting unit and the ZR22G detector.
The cylinder should be placed in a calibration gas unit case or the like to avoid any
direct sunlight or radiant heat so that the gas cylinder temperature does not exceed 40
ЊC.
Mount a regulator valve (specified by YOKOGAWA) on the cylinder.
Mount a check valve or stop valve (specified by YOKOGAWA) on the nipple (found on
the open market) at the calibration gas inlet of the detector as illustrated in Figure 4.8.
(The check valve or the stop valve may have been mounted on the detector when
shipped.) Connect the flow setting unit and the detector to a stainless steel pipe 6 mm
(O.D.) ~ 4 mm or larger (I.D.) (or nominal size 1/4 inch).
4.1.4 Piping to the High Temperature Probe Adapter
A sample gas should be at a temperature below 700
ЊC before it reaches the detector.
Also, a sample gas needs to be sucked if its pressure is negative. The piping for these
purposes should be connected to the high temperature probe adapter. For the use of the
probe adapter when the high temperature detector is used, refer to Subsection 3.2.2.
• If the pressure of a sample gas is negative, connect an auxiliary ejector (E7046EC/
E7046EN) as shown 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
ЊC.
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 a sample gas is high and its pressure exceeds 0.49 Pa, the
temperature of the sample gas at the detector may not be below 700
ЊC. In this case,
connect a needle valve (commercially available) through a nipple (commercially
available) to the sample gas outlet (Rc1/2) of the probe adapter so that the sample gas
exhaust volume can be restricted. 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 shown in Figure 4.5.