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.
Oxygen concentration in combustion exhaust gas and mixed gas
Zirconium oxide sensor
0.01 to 100 vol% O2
4 to 20 mA DC, two points (ZR402G) (maximum load resistance 550Ω)
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)
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
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
85 to 264 V AC; 45 to 66 Hz
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.
±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)
M1233SR Portable Calibration Kit
This portable calibration kit is designed for applications where there is no permanently mounted calibration solution and can be used with any ZR probe. It consists of two 103 L calibration gas bottles (1% O2, balance N2 for zero and 21% O2, balance N2 for span), two 0.5 L/min flow regulators, ten feet of tygon tubing, and one 1/4″ NPT to 1/8″ barb fitting, all contained in a hard carrying case with a shoulder strap.
MC1 Manual Calibration Panel
The MC1 can be used to calibrate the sensor and monitor reference air delivery for any ZR probe. The panel allows easy operator adjustment of calibration and reference gas flow rates, as well as manual switching between zero and span calibration gases. The panel requires standard clean, dry, instrument air for reference air and span calibration gas, and also requires zero calibration gas.
AC1 Automatic Calibration Unit
This automatic calibration unit can be used to calibrate the sensor and monitor reference air delivery for any ZR probe attached to the ZR402G analyzer. Calibration is simplified by allowing the whole calibration procedure to be done from the analyzer’s interface (or remotely) in semi-automatic mode, or by setting a timed automatic calibration in the ZR402G. The solenoid valves also have manual overrides for troubleshooting or performing a manual calibration if desired. The unit requires standard clean, dry, instrument air for reference air and span calibration gas, and also requires zero calibration gas.
IAC-24 Compact Automatic Calibration Unit
This automatic calibration unit is directly mounted to the ZR22G probe’s reference and calibration ports. Calibration is simplified by allowing the whole calibration procedure to be done from the analyzer’s interface (or remotely) in semi-automatic mode, or by setting a timed automatic calibration in the ZR402G. This unit does not have manual overrides and must be used in indoor applicaitons only. The unit requires standard clean, dry, instrument air for reference air and span calibration gas, and also requires zero calibration gas.