Yokogawa ZR22G-100-S-K-C-T-T-C-A Zirconia Oxygen Detector

Product Description

The ZR22G-100-S-K-C-T-T-C-A is a separate-type zirconia oxygen / high-temperature humidity detector manufactured by Yokogawa. This model has a 1.0m probe length, stainless steel wetted material, JIS 5K 65 FF flange, natural convection reference gas design, 1/4 NPT gas thread and 1/2 NPT terminal box thread. It is directly inserted into flue or furnace pipeline, adopting zirconia solid electrolyte sensor to realize in-situ gas measurement without gas sampling system. It works together with ZR402G or ZR802G converter for continuous oxygen and humidity monitoring in high-temperature flue gas.

Product Functions

• Real-time in-situ measurement of oxygen concentration or water vapor humidity in high-temperature flue gas via zirconia sensor principle
• Built-in heater to maintain zirconia cell working temperature for stable gas concentration detection
• Transfer raw millivolt sensor signals to matched converter for calculation and conversion into standard 4-20mA or digital communication signals
• Support continuous combustion gas analysis for boiler and furnace air-fuel ratio optimization to reduce fuel consumption and emissions
• Resist high-temperature flue gas environment, directly measure gas at up to 700℃ without sampling and cooling pretreatment
• Local self-diagnosis to detect sensor aging, heater failure, probe contamination and open/short circuit faults
• Modular sensor and heater assembly for convenient on-site replacement and maintenance without removing the whole probe from pipeline

Application Scenarios

• Flue gas oxygen monitoring for power plant boilers, industrial furnaces, incinerators and kilns
• Combustion optimization control in petrochemical, metallurgy, paper, ceramic and food processing industries
• High-temperature humidity measurement for drying processes and hot gas pipelines
• Spare replacement for existing Yokogawa ZR22G series zirconia analyzer detector assemblies
• Emission monitoring and energy-saving retrofit projects for combustion equipment
• Process gas supervision for industrial combustion control systems linked to DCS and PLC platforms

Common Problems

• Measurement drift or low reading: probe surface fouling, ash and dust deposition on zirconia sensor cell
• Sensor heater failure: heater burnout caused by thermal cycling, resulting in unstable zirconia cell temperature
• No signal output: damaged zirconia sensing element, broken internal wiring or loose terminal connections
• Gas leakage at flange: gasket aging, improper bolt torque or flange surface corrosion after long-term operation
• Slow response speed: blocked gas inlet holes, ash accumulation inside protective filter sleeve of probe tip
• Intermittent unstable readings: vibration-induced wiring fatigue, large flue gas temperature fluctuation
• Mechanical corrosion: acid gas erosion on stainless steel probe in high-sulfur flue gas environment