YOKOGAWA ZO21DW, User Manual, Page: 2 / 39

<INTRODUCTION>
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IM 11M03A02-00E
INTRODUCTION
The zirconia oxygen analyzer is used for monitoring and controlling the combustion conditions of
processes in all fields which require combustion control. This zirconia oxygen analyzer features
the direct measurement of the oxygen concentration in a furnace by inserting the detector into the
furnace. However, for accurate measurement, it is preferable that there be no pressure difference
between the measuring gas in contact with the sensor anode and the reference gas supplied on
the cathode side.
The Model ZO21DW zirconia oxygen detector is constructed in such a way that the reference
gas outlet is open to the inside of the furnace. Hence, the measured gas and reference gas
pressures can be kept at about the same level, making high accuracy measurements possible.
This instruction manual describes all the handling and operations of the Model ZO21DW Zirconia
Oxygen Detector, including installation, wiring, running, inspection, maintenance, etc. Read it
thoroughly before handling the detector in order to get a full demonstration of its performance.
For handling the converters associated with this detector, see the corresponding instruction
manual.
Before using the instruments, read any descriptions related to your instruments and system to
ensure the best performance.
User’s manual of instrument related to the ZO21DW is as follows:
Model Title Manual No.
ZR402G Separate Type Zirconia Oxygen Analyzer IM 11M12A01-02E
Media No. IM 11M03A02-00E 3rd Edition : Aug. 2018 (YK)
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