1. In-Situ Direct Measurement Principle (Core Advantage)
- No complex gas sampling system required; insert probe directly into duct/furnace to measure hot flue gas continuously.
- Solid zirconia cell sensing principle, supports dual measurement modes: oxygen concentration & high-temperature vapor humidity.
- Ultra-fast response: 90% value reached within 5 seconds, ideal for real-time combustion closed-loop controlYokogawa E....
- Wide measuring range:
- O₂: 0.01 ~ 100 vol%
- H₂O vapor: 0 ~ 100 vol%
- Mix ratio: 0 ~ 1.000 kg/kgYokogawa E...
2. Wide Temperature & Pressure Adaptability
Gas Temperature Coverage
- Standard probe: 0 ~ 700°C process gas
- Optional high-temperature adapter ZR22P: extend measuring range up to 1800°C (SiC tube option for extreme high temp)web-materi...
Pressure Tolerance
- Standard range: -5 ~ +20 kPa
- Optional pressure compensation module for -0.725 ~ +36.3 psi fluctuating furnace pressureweb-materi...
Ambient & Mechanical Spec
- Probe ambient working temp: -20 ~ +150°C
- Wetted materials: SUS316 stainless steel, zirconia ceramic core
- Multiple insertion lengths available: 0.15m / 0.4m / 0.7m / 1.0m up to 5.4m, customizable flange connections
- Three reference air supply modes: natural convection, instrument dry air, pressure compensated air supplyweb-materi...
3. High Measurement Accuracy & Stable Performance
- Oxygen accuracy: ±3% FS for 0–25 vol% O₂; ±5% FS for 0–100 vol% O₂
- Humidity accuracy: ±2 vol% H₂O under stable pressure; ±3 vol% under ±2 kPa fluctuation
- Low drift: Zero & span drift ≤ ±2% FS per month for oxygen
- Repeatability ≤ ±0.5% FS for low oxygen range (0–5 vol%)Yokogawa E...
- Built-in heating module stabilizes zirconia cell temperature automatically, eliminates cold-start measuring deviation (20-min warm-up time)Yokogawa E...
4. Modular Field Maintainable Design
- Detachable zirconia sensor cell + heater assembly: replaceable on-site without removing full probe from pipeline, greatly cut downtime and maintenance costYokogawa E...
- Optional blowback tee structure to clear dust, ash and tar accumulation on probe tip, extend service life in dusty flue gas
- Front accessible calibration gas inlet for zero/span gas calibration without disassembly
- Rotatable flange housing, flexible installation orientation for narrow industrial spaces
5. Rich Digital & Analog Signal Compatibility (Matched Converter)
When paired with ZR402G/ZR802G converter, complete signal output options:
- Dual isolated 4–20mA analog outputs (max load 550Ω)
- Digital communication protocols: HART 7, RS485 Modbus RTU, Ethernet Modbus TCP
- Multi-channel relay contacts: configurable for high/low O₂ alarm, maintenance alert, calibration status, blowback trigger, fault diagnosis signalweb-materi...
6. Comprehensive Self-Diagnosis Function
Continuous real-time monitoring of probe health status:
- Zirconia cell impedance aging & degradation warning
- Heater abnormal temperature detection
- Reference air supply pressure shortage alarm
- Probe surface fouling/ash blockage early reminder
- Full fault log stored in converter for traceable troubleshooting
- Predictive maintenance reminder reduces unnecessary offline inspection frequencyYokogawa E...
7. Explosion-Proof & Environment Protection Options
- Standard ZR22G: general industrial IP66 protection
- Explosion-proof variant ZR22S available, certified ATEX, FM, CSA, IECEx for Class I Div 1 hazardous combustion zones
- Compliant with IEC61010 safety standard, RoHS certified
8. Wide Industrial Application
- Power plant boiler, waste incinerator flue gas oxygen control for energy saving & NOx reduction
- Steel, ceramic, kiln low-oxygen firing atmosphere monitoring
- Petrochemical furnace, heating furnace combustion optimization
- Pulp & paper, food, textile high-temperature drying oven humidity control
- Industrial thermal treatment, heat treatment furnace atmosphere detection
9. Operation Cost (OPEX) Advantages
- Sampling system eliminated: no cooler, filter, pump & regular sampling pipeline maintenance
- Modular replaceable sensor reduces spare parts cost
- Blowback accessory prolongs probe service life in dusty gas
- Precise oxygen control improves combustion efficiency, cuts fuel consumption and lowers exhaust pollutant emissions
