Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 78)

IM 11M12D01-01E 4-12
4.2.3 Piping for the Reference Gas
The piping for the reference gas should be installed between the air source (instrument
air) and the detector through flowmeters and needle valves for flow control of the
reference air, and an air set.
• Install the piping from the reference gas inlet of the detector to the air source with a
flow meter, a needle valve where necessary, and an air set in this order.
• Install the flowmeter, needle valve and air set in close proximity.
• Use stainless steel pipes with 6 OD x 4 ID mm (or nominal 1/4 inch) or larger inside
diameter for the piping for the reference gas.
4.2.4 Piping to the High Temperature Probe Adapter
The piping to the high temperature probe adapter is required when a high temperature
detector is used.
This piping is the same as the one in the system using flow setting units for manual
calibration. See Subsection 4.1.4.
4.2.5 Piping for Blowback
The piping for blowback is required only when the blowback is conducted in a system
using a high temperature detector. This piping is the same as the one in the system using
flow setting units for manual calibration. See Subsection 4.1.5.
4.2.6 Piping for Indication Check
To perform an indication check using the third check gas, the piping to allow the third
gas to flow into the calibration gas line is required in addition to the system
configuration shown in Figure 4.9.
Route the piping from the third check gas cylinder through a pressure reducing valve
and a stop valve to the solenoid valve for switching the span gas and the third check
gas, as shown in Figure 4.12.
It is recommended that the piping and wiring for the solenoid valve for switching the
span gas and the third check gas be installed to allow the third check gas to be
introduced when powered. This solenoid valve is activated by a contact signal from the
averaging converter (Power wiring is separately required.)
Stop valve
Analog outouts:
(Averaged and individual output)
Contact output
Contact input
Instrument air
Power supply
Detector
Solenoid valve
Calibration gas line
Reference
gas line
Flowmeter
Needle valve
Pressure regulator
Air set
Needle valve
Solenoid valve
Flowmeter
Zero gas cylindr
Span gas cylinder
(Instrument air)
Calibration
contact outputs
Signal
Heater
Averaging converter(AV550G)
Third check gas cylinder
Contact output
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: If optional 24 V outputs are specified for solenoid valve (MS Code "/24"), no external power supply for solenoid valves is required.
The solenoid valves are powered from the AV550G Averaging Converter. Never connect external power sources in the wiring for
solenoid valves.
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Figure 4.12 Piping for Automatic Indication Check Using 3rd Check Gas