Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 16)

IM 11M13A01-04E 1-2
1.1 < EXAxtZR > System Configuration
The system configuration should be determined by the conditions; e.g. whether the
calibration 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. Instrument air (clean and dry air of
oxygen concentration 21%) is used as the reference gas and the span gas for calibration.
Zero gas is fed from a cylinder during calibration. The gas flow is controlled by the
ZA8F flow setting unit (for manual valve operation).
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ZR202S Integrated type Explosionproof
Zirconia Oxygen Analyzer
F06.EPS
ZA8F flow setting unit
Reference gas
Calibration gas
Needle
valve
Flowmeter
Instrument air
Air Set
Pressure regulator Zero gas
cylinder
Stop valve
or
Check valve
Span gas (*4)
Non-hazardous area Hazardous area
100 to 240 V AC