System 2 - YOKOGAWA ZR22G User Manual

ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
Stop valve
Figure1.1
NOTE
• As this system uses ambient air for the reference gas, measuring accuracy will be affected
by the installation location.
• A needle (stop) valve should be connected to the calibration gas inlet of the detector.
The valve should be fully closed unless calibration is in progress.
1.1.2

System 2

This system is for monitoring and controlling oxygen concentration in the combustion gases of a
large-size boiler or heating furnace. Clean (dry) air (21 vol%O
the span gas for calibration.
In case of humidity analyzer, this system is for accurate monitoring and controlling humidity when
the installation environment is polluted with gases other than the air. Instrument air (clean and dry
air of oxygen concentration 21%) is used for the reference gas and the span gas for calibration.
Zero gas is fed in from a cylinder during calibration. The gas flow is controlled by the ZA8F flow
setting unit (for manual valve operation).
ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
Check valve
or Stop Valve
Figure1.2
Signal
(6-core shield cable)
Heater(2-core)
Calibration gas
ZO21S Standard gas unit
System 1
Signal
(6-core shield cable)
Heater(2-core)
Flowmeter
Reference
gas
Calibration gas
ZA8F Flow Setting Unit
System 2
ZR802G Converter
100 to
~
240 V AC
~
) is used as the reference gas and
2
ZR802G Converter
100 to
~
240 V AC
Needle
valve
Air Set
Pressure
reducing
valve
Calibration gas
unit case
<1. Overview>
Contact input
Analog output, contact output
(Digital output HART)
F1-1E.ai
Contact input
Analog output, contact output
(Digital output HART)
Instrument air
Span gas
(Same as Zero gas calibration unit)
Zero gas
cylinder
F1-2E.ai
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
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