YOKOGAWA ZR22S, Руководство пользователя

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<4. Piping>
4-2
IM 11M13A01-02E
4.1 Piping for a System Using Flow Setting Unit
for Manual Calibration
The piping for a system using flow setting units for manual calibration is shown in Figure 4.1.
ZA8F
Flow Setting Unit
ZR22S Separate type Explosion-proof
ZR402G Converter
Reference gas
Calibration gas
Stop valve
or
Check valve
Needle
valve
Flowmeter
Instrument air
Air Set
Pressure
reducing
valve
Zero gas
cylinder
F04-1E.ai
Span gas (*)
* Calibration gas unit same as for zero gas.
Zirconia Oxygen Analyzer, Detector
Calibration gas
unit case
EXA ZR402G
Non-hazardous Area
Hazardous Area
~ 100 to 240 V AC
Contact input
Analog output,
contact output
Digital output
(HART)
Figure 4.1 Typical Piping for System Using Flow Setting Unit for Manual Calibration
The following outlines some points to note regarding the piping for this system.
• Connect a stop valve or check valve to the nipple at the calibration gas inlet of the detector.
• When a high temperature detector is used and the sample gas pressure is negative,
connect an auxiliary ejector to the sample gas exhaust hole of the high temperature probe
adapter (see Subsection 4.1.5, Figure 4.3).
• When a high temperature detector is used and the pressure of the measured gas is 0.5
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 Subsection 4.1.5, Figure 4.4).
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
700ºC 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 should be protected with an insulating material to prevent
condensation (see Figure 4.5).
For the usage of the high temperature probe adapter, refer to Subsection 3.2.2.
• 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.