<1. Overview>
1-3
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
1.1.3 System 3
This example, System 3, represents typical applications in large boilers and heating furnaces,
where there is a need to monitor and control oxygen concentration. The reference gas and
calibration-time span gas are (clean, dry) instrument air. Zero gas is supplied from a gas cylinder.
System 3 uses the ZR40H automatic calibration unit, with auto-switching of the calibration gas.
output from the converter that can be used to operate a purge gas valve to supply air to the
detector.
F1-3E.ai
ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
ZR802G Converter
Signal
(6-core shield cable)
Heater (2-core)
Reference gas
Calibration gas
Flowmeter
Needle
valve
Zero gas cylinder
100 to 240 V AC
*3
Check valve
Contact input
Analog output, contact output
Digital output (HART)
Air Set
lnstrument air
Pressure
reducing
valve
*1
*2
~
Calibration gas
unit case
ZR40H
Automatic Calibration Unit
*3 When a zirconia oxygen analyzer is used, 100% N2 gas cannot be used as the zero gas. Use approximately 1% of O2 gas (N2-
based).
Figure1.3 System 2
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