Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 17)

IM 11M13A01-02E 1-2
1.1 < EXAxtZR > System Configuration
The system configuration should be determined by the conditions; e.g. whether calibra-
tion is to be automated, and whether flammable gas is present and requires safety
precautions. The system configuration can be classified into two basic patterns as
follows:
1.1.1 System 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
2
) is used as 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).
~
ZA8F flow setting unit
EXA ZR402G
ZR22S Separate type Explosionproof
ZR402G Converter
Reference gas
Calibration gas
Stop valve
or
Check valve
Needle
valve
flowmeter
Instrument air
Air Set
Pressure regulator Zero gas
cylinder
F1.1E.EPS
Span gas (*)
* Calibration gas unit same as for zero gas.
Zirconia Oxygen Analyzer, Detector
100 to
240 V AC
Non-hazardous area Hazardous area
Figure 1.1 System configuration 1