<1. Overview>
1-2
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
ZR802G Converter
Stop valve
Calibration gas
ZO21S Standard gas unit
~
100 to
240 V AC
F1-1E.ai
Contact input
Analog output, contact output
(Digital output HART)
Signal
(6-core shield cable)
Heater(2-core)
~
Figure1.1 System 1
NOTE
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
2
) is used as the reference gas and
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.
setting unit (for manual valve operation).
F1-2E.ai
ZR802G Converter
Check valve
or Stop Valve
ZA8F Flow Setting Unit
ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
100 to
240 V AC
Air Set
Instrument air
Calibration gas
Reference
gas
Flowmeter
Needle
valve
Calibration gas
unit case
Zero gas
cylinder
Span gas
(Same as Zero gas calibration unit)
Contact input
Analog output, contact output
(Digital output HART)
Signal
(6-core shield cable)
Heater(2-core)
~
Pressure
reducing
valve
Figure1.2 System 2
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