Model ZR22G, ZR402G, and ZR202G Direct In Situ Zirconia Oxygen Analyzers and High Temperature Humidity Analyzers0 pages

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General
Specications

Model ZR22G, ZR402G, and ZR202G
Direct In Situ Zirconia Oxygen Analyzers and
High Temperature Humidity Analyzers

GS 11M12A01-01E

Overview
This analyzer consists basically of a probe and a
converter that are used as both a Zirconia Oxygen
Analyzer and High Temperature Humidity Analyzer.
The probe is of direct insertion type, and the converter
uses a digital display.
Two types of analyzers are available: separate
type and integrated type. As its name implies, the
integrated type combines probe and converter.
Separate and integrated type Zirconia oxygen
analyzers need not use a sampling device, and allow
direct installation of the probe in the wall of a ue
or furnace to measure the concentration of oxygen
in the stack gas. The converter displays the cell
temperature and cell emf in addition to the oxygen
concentration.
This analyzer is most suitable for monitoring the
oxygen concentration of combustion gases in large
or small boilers, various industrial furnace and
combustion devices, or for the control of low-oxygen
combustion.
Separate type and integrated type Zirconia High
Temperature Humidity Analyzers are used to measure
the humidity of hot gases continuously in driers which
use an electrical heater or hot gas as the heat source.
They can also be used in a variety of manufacturing
applications in humidiers, as well as in driers, for
humidity measurement and control. They can help
improve productivity in these application elds.

Features:
• The built-in heater assembly of the probe can be
replaced on site, reducing maintenance costs.
• The probe uses a long-life, high-reliability Zirconia
sensor.
• The probe uses three-reference gas supply methods
(natural air convection, instrument air, and pressure
compensated) in its applications.
• The separate type converter incorporates a LCD
touchscreen for ease of operation.

• This converter can be used as an oxygen analyzer as
well as a high temperature humidity analyzer.
• The integrated type integrates both probe and
converter, to reduce wiring, piping, and installation
costs. This type of unit uses an optical switch for
ease of operation at the site.
• Remote maintenance using digital communications
(HART) reduces maintenance costs. *1
*1: HART is a registered trademark of HART
Communication Foundation

4 to 20 mA DC signal line with
superimposed HART AC signal
Relaying
terminals
Ao+
+

ZR202G

Control room
Terminal board

–
Ao-

Receiving instrumen
load resistance:
250 Ω to 550 Ω

EXA ZR402G

ZR402G

Ao1+
Ao1-

HART
Communicator
Model 275

HART
Communicator
Model 275

HART
Communicator
Model 275

Yokogawa Electric Corporation
2-9-32, Nakacho, Musashino-shi, Tokyo, 180-8750 Japan
Tel.: 81-422-52-5617 Fax.: 81-422-52-6792

F34.ai

GS 11M12A01-01E
©Copyright June 2000
12th Edition Dec. 2012