Piping For System 2 - YOKOGAWA ZR22G User Manual

4.2

Piping for System 2

Piping in System 2 is illustrated in Figure 4.7.
ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
Stop valve
or Check valve
Figure 4.7
System 2 illustrated in Figure 4.7 requires piping as follows:
• Connect a stop valve or check valve the nipple at the calibration gas inlet of the detector.
• It is recommended to use ZH21B dust protector to protect the probe output from dust
agitation (i.e., to prevent combustible materials from entering the probe cell) where humidity
measurements are made under dusty or combustible environment.
• If a high temperature detector is used and the sample gas pressure is negative, connect
an ejector assembly to the sample gas exhaust hole of the high temperature probe adapter
(see Section 4.1.4, "Figure 4.3
• If a high temperature detector is used and the pressure of the sample gas is 0.49 kPa or
higher, it is recommended that a needle valve (throttle) be used in the sample gas exhaust
of the high temperature probe adapter (see Section 4.1.4, "Figure 4.4
needle valve for restricting exhaust flow of the sample gas").
CAUTION
This is for lowering the sample gas temperature below 700°C. If the gas temperature is high and
the pressure is also significantly high, the sampled gas temperature may not reduced below
700°C when reaching the detector.
On the other hand, if the sample gas temperature is lowered too much, condensation may be
produced 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
(see Section 4.1.4, "Figure 4.5 Preventing to condensation").
For the usage of the high temperature probe adapter, refer to Section "3.2.1
High Temperature Probe Adapter (ZO21P-H)".
• If the dust sticking to the interior of the high temperature probe adapter is to be eliminated by
blow back while using the high temperature detector, the air feed for blow back should also
be taken into consideration.
ZR802G Converter
Signal
(6-core shield cable)
Heater (2-core)
Flowmeter
Needle
Reference
valve
gas
Calibration
gas
ZA8F Flow Setting Unit
Piping for System 2
100 to
~
240 V AC
Contact input
Analog output, Contact input
Digital output (HART)
Air Set
Instrument air
Span gas
(Same as Zero gas Calibration)
Pressure
Zero gas cylinder
reducing
valve
Calibration gas
unit case
Mounting the ejector assembly").
<4. Piping>
F4-7E.ai
Mounting the
Usage of the
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
4-5