YOKOGAWA ZR402G Single Channel Oxygen Analyzer

The YOKOGAWA 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.


REPEATABILITY ±0.5% Maximum value of set range
LINEARITY ±1% Maximum value of set range
DRIFT ±2% Maximum value of set range/month
RESPONSE TIME (T90) 90% response within 5 sec (60 sec for explosion-proof ZR22S)
12-Month-Warranty-dental-ha12 Month Warranty On All Parts 100% Tested & Cleaned Guaranteed 100-Cleaned-GuaranteedFree Technica Support

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YOKOGAWA ZR402G Single Channel Oxygen Analyzer

The ZR22G/ZR402G Separate Type Zirconia Oxygen Analyzers have the following features:
• A general-purpose detector can directly measure gas of up to 700ºC. Moreover, when combined with the high-temperature probe adapter, it can measure gas of up to 1400ºC.
• For the Zirconia cell, which is a key component of zirconia oxygen analyzers, a zirconia element and platinum electrodes are molecularly bonded by a method developed by Yokogawa. Therefore, the zirconia sensor can deliver consistent measurements for a long period without the electrode being peeled off.
• The heater assembly used to heat up the zirconia cell is constructed so that it can be replaced in the field. Even if a wire in the heater breaks, the heater can be easily replaced in the field.
• The converter features a large liquid-crystal display that is easy to see and read.
• A high-resolution graphic display is available, and trend graph display of up to 150 min is possible.
• A touch panel is used for operations, allowing information to be easily read out and set up.
• Operations are performed interactively with the operation display, so the Instruction Manual is not needed in daily operations.
• During calibration, the sensor (cell) response time, internal resistance value, zero calibration factor, span collection factor, etc. are checked and the data are evaluated comprehensively.This allows the remaining life of the cell to be predicted.
• Two current outputs (4 – 20 mA) and four SPDT relay contact outputs are available. Measurement data, alarms, errors, etc. can be output.

YOKOGAWA ZR402G Separate Type Converter
Complete Operation Display
• Interactive operations along with operation display.
• A variety of display modes – enabling you to select the operation mode freely.
• Back-lit LCD allows viewing even in the darkness.
• Error codes and details of errors can be checked in the field without the need to refer to the appropriate instruction manual.

YOKOGAWA ZR402G Converter Functions and Features

Human Machine Interface (HMI)
• Equipped with a back-lit large display unit that is easy to see and read.
• High-resolution graphic display. Up to 150 minutes of trend graph can be displayed.
• The touch panel allows information to be easily read and set up.
• Interactive operations along with operation display, eliminating the need for an Instruction Manual.

Touch Panel Switch

The YOKOGAWA ZR402G uses a touch panel that can be operated by just touching the switch display. The switches displayed in this area and their functions vary depending on the panel display, allowing all switch operations. Figure 5.2 shows the types of switches and their functions.

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)
CALIBRATION 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 consumptionNatural convection
POWER SUPPLY 85 to 264 V AC; 45 to 66 Hz

Yokogawa ZR22 ZR402G user manual download