Specifications
Parameter Specification
Model Yokogawa ZR202S
Measurement Principle Zirconia sensor (electrochemical cell)
Measurement Range 0.1 ppm to 25% O₂ (multiple ranges available)
Accuracy ±1% of reading or ±0.5% O₂ (whichever is larger)
Response Time T90 < 15 seconds (for 90% response)
Sensor Operating Temperature 700°C to 800°C (standard)
Sample Gas Temperature Max. 200°C (without cooler)
Sample Gas Pressure 0.1 to 0.5 MPa (gauge pressure)
Output Signals 4-20 mA analog output (isolated)
Communication Interface RS-485 (MODBUS protocol)
Power Supply 100-240 V AC, 50/60 Hz
Operating Temperature -20°C to +55°C (electronics)
Enclosure Rating IP66 (NEMA 4X)
Dimensions Approximately 400 × 300 × 200 mm
Weight Approx. 15 kg
Key Features
High accuracy oxygen measurement

Fast response time (<15 seconds)

Wide measurement range from 0.1 ppm to 25% O₂

Robust construction for harsh environments

Easy maintenance and sensor replacement

Multiple output options (analog and digital)

IP66 rated enclosure for outdoor use

Measurement Performance
Minimum detectable concentration: 0.1 ppm O₂

Linearity: ±1% of full scale

Zero drift: ±1% of full scale per month

Span drift: ±1% of full scale per month

Repeatability: ±0.5% of reading

Environmental Conditions
Ambient temperature: -20°C to +55°C

Relative humidity: 5% to 95% RH (non-condensing)

Altitude: Up to 2000 m above sea level

Electrical Specifications
Power consumption: Max. 150 VA

Analog output: 4-20 mA DC, max. load 600 Ω

Alarm contacts: 2 SPDT relays, 250 V AC, 3 A

Isolation: 1500 V AC between all circuits

Sample Gas Conditions
Maximum particulate loading: <0.1 g/m³

Maximum moisture content: 85% RH (non-condensing)

Flow rate: 0.5 to 2.0 L/min (recommended)

Typical Applications
Boiler combustion optimization

Furnace efficiency monitoring

Flue gas oxygen analysis

Environmental emission monitoring

Chemical process control

Inert gas system monitoring

Incinerator gas analysis