Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 16)

IM 11M12A01-03E 1-3
1. Overview
1.1.2 System 2
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 calibra-
tion. 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).
F1.2E.EPS
ϳ
Model ZR402G Converter
Check valve
or Stop valve
Model ZA8F flow setting unit
EXA ZR402G
Separate type Zirconia
High Temperature Humidity Analyzer,
Model ZR22G Detector
100 to 240 V AC
Air Set
Instrument air
Calibration gas
Reference
gas
Flowmeter
Needle
valve
Calibration gas pressure regulator
Calibration gas
unit case
Zero gas cylinder
Span gas (Same as Zero gas
calibration unit)
Contact input
Analog outout, contact output
Digital output (HART)
Signal
(6-core shield cable)
Heater (2-core)
Figure1.2