Product Introduction
I.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor) Description
Alphasense's sulfur dioxide gas sensors use proven fuel cell technology.
Sulfur Dioxide Sensor Dimensions:
Diameter 20mm, industry standard size for portable gas detectors
The SO2 series provides OEMs with reliable sensors for various applications. Strong signal levels combined with low zero current allow resolution below 1ppm, with operating ranges up to 2000ppm for safety applications. Sensors are designed for both fixed and portable instruments.
SO2 sensors provide reliable long-term detection performance with no electrolyte leakage. For easy identification, the leak-proof housing is molded with color-coded tops.
II.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor)Typical Applications
Air quality trace sulfur dioxide monitoring, sulfur dioxide gas transmitters.
III.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor)Performance
| Sensitivity | 2ppm SO2，nA/ppm | 320~480 |
| Response Time | t90 from zero to 2ppm SO2 (s) | <20 |
| Zero Current | In zero air at 20°C (nA) | 5~45 |
| Noise* | Average noise (ppb) | 15 |
| Detection Limit* | ppb | 15 |
| Range | SO2 warranty detection range (ppm) | 50 |
| Linearity | 20ppm error, linear at 0-2ppm (ppb) | 0-5 |
| Overload | Maximum ppm for stable response to gas pulses | 100 |
*Requires low-noise voltage regulation circuit to achieve lower noise and better resolution
IV.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor)Lifetime
| Zero Drift | Change in ppb per year in laboratory air | <±20 |
| Sensitivity Drift | Percentage change per year in laboratory air | <±15 |
| Operating Life | Time for output to drop to 80% of original signal (months) (24-month warranty) | >36 |
V.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor)Environment
| Sensitivity at -20°C | At 2ppm, (output at -20°C / output at 20°C) % | 80~95 |
| Sensitivity at 50°C | At 2ppm, (output at 50°C / output at 20°C) % | 90~105 |
| Zero at -20°C | Change in ppm relative to 20°C | <±25 |
| Zero at 50°C | Change in ppm relative to 20°C | 150~300 |
VI.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor)Key Parameters
| Temperature Range | ℃ | -30~50 |
| Pressure Range | Kpa | 80-120 |
| Humidity Range | %rh | 15-90 |
| Storage Life | Sealed storage life at 3-20°C (months) | 6 |
| Load Resistor | Ω (recommended) | 33-100 |
VII.SO2-A4 Sulfur Dioxide Sensor (SO2 Sensor)Companion Sensor Circuit Board:
Analog Front End (AFE) A4 Series Air Quality Sensor - AFE
Based on product design, A4 series air quality sensors need to be used with an analog front end (AFE): Since portable monitoring devices require compact size, we designed the circuit board with high component density to save valuable space for your monitoring device. Now simply connect the AFE and A4 sensor to a multiplexed ADC to quickly record air quality data.
