System 2 - YOKOGAWA EXAxtZR Instruction Manual

Model ZR22G Separate type Zirconia Oxygen
Analyzer, Detector
1.1.2

System 2

Model ZR22G Separate type Zirconia Oxygen
Analyzer, Detector
Check valve
or Stop Vallve
Calibration gas
1-2
Signal
Stop valve
(6-core shield cable)
Heater(2-core)
Calibration gas
Figure1.1
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% O
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).
Model ZR402G Converter
Signal
(6-core shield cable)
Heater(2-core)
Model ZA8F flow setting unit
Flowmeter
Reference
gas
Calibration gas pressure regulator
Figure1.2
Model ZR402G Converter
EXA ZR402G
Model ZO21S Standard gas unit
EXA ZR402G
100 to
240 V AC
Needle
valve
Air Set
Calibration gas
unit case
100 to
240 V AC
Contact input
Analog output, contact output
(Digital output HART)
F1.1E.EPS
) is used as the
2
Contact input
Analog output, contact output
(Digital output HART)
Instrument air
Span gas (Same as Zero gas calibration unit)
Zero gas
cylinder
F1.2E.EPS
IM 11M12A01-02E