Overview; Exaxt Zr > System Configuration; System 1 - YOKOGAWA ZR22G User Manual

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Overview

The EXAxt ZR Separate type Zircon Oxygen/Humidity 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 EXAxt ZR also contributes to preservation of the earth's environment in preventing global
warming and air pollution by controlling complete combustion to reduce CO
The 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 0.15 m long
detector, which is combined with the ZO21P, the high temperature probe protector.
The EXAxt ZR Separate-type Zirconia Humidity Analyzer is used to measure the humidity of hot
gases continuously in driers which use hot gas or electricity as the heat source. It can also be
used in a variety of manufacturing applications in humidifiers, as well as in driers, for humidity
measurement and control. It can help improve productivity in these application fields.
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 functions including self-test. Analyzer
calibration can also be fully automated — and the ZR40H, 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:
1.1 < EXAxt ZR > System Configuration
The system configuration should be determined by the conditions; e.g. whether calibration 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:
1.1.1

System 1

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, and can be implemented for monitoring humidity in a production process such as food
production.
No piping is required for the reference gas (air) which is fed in at the installation site. The handy
the 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.
<1. Overview>
, SOx and NOx.
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IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
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