Product Introduction
1. Description of High-Resolution Ozone (O3) + Nitrogen Dioxide (NO2) Sensor OX-A431
OX-A431 can detect both O3 and NO2 (O3+NO2), but NO2-A43F can only measure NO2 while filtering out O3. By using both sensors simultaneously, subtract the calibrated NO2-A43F concentration from the calibrated OX-A431 concentration to obtain the O3 concentration.
Before performing the subtraction to determine O3 concentration, ensure that the electronic zero offset, sensor zero offset, temperature characteristics, sensitivity (nA/ppm), and sensitivity temperature characteristics of both sensor signals have been calibrated.
2. Applications of High-Resolution Ozone (O3) + Nitrogen Dioxide (NO2) Sensor OX-A431
Trace ozone monitoring in air quality, ozone gas transmitters.
Ozone Sensor (O3 Sensor) Parameters
High-Resolution Ozone Sensor (O3 Sensor) Performance
| Sensitivity |
Sensitivity at 1ppm O3 (nA/ppm) | -200~ -550 |
| Response Time | t90 time from zero to 1ppm O3 | <45 |
| Zero Current | Output in zero-grade air at 20°C (nA) | -50~70 |
| Noise* | Standard deviation ±2 (equivalent ppb) | 15 |
| Range | Measurement limit ensuring product performance (ppm) | 20 |
| Linearity | ppm error of full scale, linear from 0 to 20ppm O3 | < ±0.5 |
| Overload | Maximum ppm value for stable response to gas pulses | 50 |
| *Tested with Alphasense | AFE low-noise circuit board | |
High-Resolution Ozone Sensor (O3 Sensor) Lifetime
| Zero Drift |
Equivalent ppb change per year in laboratory air | 0~20 |
| Sensitivity Drift | Percentage change per year in laboratory air, monthly test | <-20~-40 |
| Operating Life | Months until output drops to 50% of original signal (24-month warranty) | >24 |
High-Resolution Ozone Sensor (O3 Sensor) Environment
| Sensitivity at -20°C |
At 2ppm O3, (output at -20°C / output at 20°C) % | 60~80 |
| Sensitivity at 40°C | At 2ppm O3, (output at 40°C / output at 20°C) % | 80~105 |
| Zero at -20°C | nA | 0~25 |
| Zero at 40°C | nA | 20~90 |
High-Resolution Ozone Sensor (O3 Sensor) Cross Sensitivity
| H2S | Sensitivity percentage to measured gas at 5ppm H2S | <100 |
| NO | Sensitivity percentage to measured gas at 5ppm NO | <5 |
| Cl2 | Sensitivity percentage to measured gas at 5ppm Cl2 | <85 |
| SO2 | Sensitivity percentage to measured gas at 5ppm SO2 | <-6 |
| CO | Sensitivity percentage to measured gas at 5ppm CO | <0.1 |
| C2H4 | Sensitivity percentage to measured gas at 100ppm C2H4 | <0.1 |
| NH3 | Sensitivity percentage to measured gas at 20ppm NH3 | <0.1 |
| H2 | Sensitivity percentage to measured gas at 100ppm H2 | <0.1 |
| CO2 | Sensitivity percentage to measured gas at 5% Vol CO2 | 0.1 |
| Halothane | Sensitivity percentage to measured gas at 100ppm Halothane | <0.1 |
High-Resolution Ozone Sensor (O3 Sensor) Key Parameters
| Temperature Range |
℃ | -30~40 |
| Pressure Range | Pa | 80~120 |
| Humidity Range | Continuous Relative Humidity Percentage | 15~85 |
| Storage Life | Storage months at 3~20°C (must be stored in sealed can) | 6 |
| Load Resistance | Ω (AFE circuit board recommended) | 33~100 |
| Weight | g | < 6 |
