Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate ty

description:Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate type Converter ZR402G...

Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate type Converter ZR402G

Yokogawa's zirconia oxygen analyzers are used for combustion monitoring and control in a wide variety of applications and help industries to make considerable achievements in energy saving. The applications range from energy-consuming industries, such as iron and steel, electric power, oil and petrochemical, ceramics, pulp and paper, food, and textiles, to various combustion facilities, such as incinerators and small- and medium sized boilers. Combustion monitoring and control using the analyzer also contribute to a lowering of CO2, SOx, and NOx emissions by allowing for more complete combustion, thus preventing global warming and air pollution.


The ZR402G 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. 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. The ZR22S separate-type detector for explosion-proof applications is also available.


Features of Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate type Converter ZR402G

· The separate type converter ZR402G incorporates a LCD touchscreen for ease of operation.

· The built-in heater assembly of the probe can be replaced on site, reducing maintenance costs (ZR22G only).

· The probe uses a long-life, high-reliability, field replacable Zirconia sensor.

· Remote maintenance using digital communications (HART) reduces maintenance costs.

Note: HART is a registered trademark of HART Communication Foundation.


Specification of Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate type Converter ZR402G

Measurement object

Oxygen concentration in combustion exhaust gas and mixed gas

Measurement system

Zirconium oxide sensor

Measurement range

0.01 to 100 vol% O2

Output signal

4 to 20 mA DC, two points (ZR402G) (maximum load resistance 550Ω)

Setting range

Any setting in the range of 0 - 5 vol%O2 to 0 - 100 vol%O2 (in 1 vol% O2), or partial range

Digital communication (HART)

250 to 550Ω, depending on number of field devices connected to the loop (multi-drop mode)

Sample gas pressure

-5 to +250 kPa (Pressure compensation option necessary over +5 kPa)

Sample gas temperature

0 to 700℃ (Probe only)
700 to 1871℃ (with 0.15m probe with JIS 5K 32 FF flange and ZR22P High Temperature Probe Adapter)

Probe length

0.15, 0.4, 0.7, 1.0, 1.5, 2.0, 2.5, 3.0, 3.6, 4.2, 4.8, 5.4 m

Contact output

Four points (one is fail-safe, normally open)

Contact input

Two points


Method; zero/span calibration
Calibration mode; automatic, semi-automatic and manual (with an LCD touchscreen)

Construction of detector (ZR22G)

Heater and thermocouple replaceable construction. 
Non-explosion-proof. Equivalent to NEMA4X/IP66

Construction of converter (ZR402G)

Non-explosion-proof, outdoor installation, equivalent to NEMA4X/IP66

Ambient Temperature

Probe (ZR22G): -20 to 150℃
Converter (ZR402G): -20 to 55℃)

Reference Gas System

Instrument Air (preferred): 50 kPa (200 kPa with check valve) + the pressure inside the furnace; Approx. 1 Nl/min consumption

Natural convection

Power supply

85 to 264 V AC; 45 to 66 Hz

Performance of Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate type Converter ZR402G


±0.5% Maximum value of set range


±1% Maximum value of set range


±2% Maximum value of set range/month

Response time (T90)

90% response within 5 sec (60 sec for explosion-proof ZR22S)


Ordering Models of Yokogawa ZR402G-M-E-E-A Zirconia Oxygen Analyzer Separate type Converter ZR402G

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