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1.
Overview
1.1 < EXAxtZR > System Configuration
1.1.1
System 1
IM 11M12A01-02E
The EXAxtZR Separate-type Zircon Oxygen Analyzer is used to monitor and control the
oxygen concentration in combustion gases, in boilers and industrial furnaces, for wide
application in industries which consume considerable energy such as steel, electric
power, oil and petrochemical, ceramics, paper and pulp, food, or textiles, as well as
incinerators and medium/small boilers. It can help conserve energy in these industries.
The EXAxtZR also contributes to preservation of the earth's environment in preventing
global warming and air pollution by controlling complete combustion to reduce CO
SOx and NOx.
ZR22G Separate-type Detector uses a high-reliability Zirconia sensor, and its heater
assembly can be replaced on site. The detector is mounted, for example, on the wall of a
flue and can measure the gases directly.
For use in combustion gases at temperatures up to 1400°C, choose the general-use
0.15m long detector, which is combined with ZO21P-H, the high-temperature probe
protector. The converter is equipped with an LCD touch screen which has various
setting displays, a calibration display, oxygen concentration trend display, with easier
operation and improvement of display functions. The converter is equipped with various
standard functions such as measurement and calculation as well as maintenance func-
tions including self-test. Analyzer calibration can also be fully automated
an automatic calibration unit, is available. Choose the detector version which best suits
your needs so that an optimal combustion control system can be obtained.
Some examples of typical system configurations are illustrated below:
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 three basic patterns as
follows:
This is the simplest system consisting of a detector and a converter. This system can be
implemented for monitoring oxygen concentration in the combustion gases of a package
boiler. No piping is required for the reference gas (air) which is fed in at the installation
site. The handy ZO21S standard gas unit is used for calibration.
Zero gas from this unit and span gas (air) is sent to the detector through a tube which is
connected during calibration. A needle (stop) valve should be connected to the calibra-
tion gas inlet of the detector. The valve should be fully closed unless calibration is in
progress.
CAUTION
• As this system uses ambient air for the reference gas, measuring accuracy will be
affected by the installation location.
1. Overview
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2
and ZR40H,
1-1
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