• Sulfur Dioxide Sensor (SO2 Sensor) 4-Electrode
  • Sulfur Dioxide Sensor (SO2 Sensor) 4-Electrode
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Sulfur Dioxide Sensor (SO2 Sensor) 4-Electrode

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  • Price

    Price on request   ≥1piece

  • Model Number

    SO2-A4

  • Data Sheet

  • Package

    Original packaging

  • Specs

    SO2-A4

  • Quantity

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Product Description

SO2-A4 Sulfur Dioxide Sensor SO2 Sensor Description
Alphasense Sulfur Dioxide gas sensors operate using proven fuel cell technology.

SO2-A4 Sulfur Dioxide Sensor size:
20mm diameter, the industry standard size for portable gas detectors

The SO2 range provides OEMs with reliable sensors for use in a variety of applications. Strong signal levels combined with low zero current allows resolution below 1ppm and an operating range for safety applications up to 2,000ppm. The sensors are designed for use in both fixed site and portable instrumentation.

The SO2 sensors offer our electrolyte leak-free guarantee and reliable long-term detection performance. The leakproof housing is moulded with a colour coded top for ease of identification.


SO2-A4 Sulfur Dioxide Sensor SO2 Sensor PERFORMANCE
Sensitivity
 nA/ppm at 2ppm SO2
 320 to 480
Response time
 t90 (s) from zero to 2ppm SO2
 < 20
Zero current
 nA in zero air at 20°C
 5 to 45
Noise*
 ±2 standard deviations (ppb equivalent)
 15
Range
 ppm limit of performance warranty
 50
Linearity
 ppb error at 20ppm SO2, linear at zero and 2ppm SO2
 0 to -5
Overgas limit
 maximum ppm for stable response to gas pulse
 100
* Tested with Alphasense AFE low noise circuit



SO2-A4 Sulfur Dioxide Sensor SO2 Sensor LIFETIME
Zero drift
 ppb equivalent change/year in lab air
 < ±20
Sensitivity drift
 % change/year in lab air, monthly test
 < ±15
Operating life
 months until 50% original signal  (24 month warranted)
 > 36



SO2-A4 Sulfur Dioxide Sensor SO2 Sensor ENVIRONMENTAL
Sensitivity @ -20°C
 (% output @ -20°C/output @ 20°C) @ 2ppm SO2
 80 to 95
Sensitivity @ 50°C
 (% output @ 50°C/output @ 20°C) @ 2ppm SO2
 90 to 105
Zero @ -20°C
 nA change from 20°C
 < ± 25
Zero @ 50°C
 nA change from 20°C
 150 to 300



SO2-A4 Sulfur Dioxide Sensor SO2 Sensor CROSS SENSITIVITY
Filter capacity
 ppm·hrs
 450
H2S   sensitivity
 % measured gas @ 5ppm H2S
 < 40
NO2  sensitivity
 % measured gas @ 5ppm NO2
 < -160
Cl2    sensitivity
 % measured gas @ 5ppm Cl2
 < -70
NO    sensitivity
 % measured gas @ 5ppm NO
 < -1.5
CO    sensitivity
 % measured gas @ 5ppm CO
 < 2
H2     sensitivity
 % measured gas @ 100ppm H2
 < 1
C2H4 sensitivity
 % measured gas @ 100ppm C2H4
 < 1
NH3   sensitivity
 % measured gas @ 20ppm NH3
 < 0.1
CO2   sensitivity
 % measured gas @ 5% CO2
 < 0.1


    
SO2-A4 Sulfur Dioxide Sensor SO2 Sensor KEY SPECIFICATIONS
Temperature range
 °C
 -30 to 50
Pressure range
 kPa
 80 to 120
Humidity range
 % rh continuous (see note below)
 15 to 90
Storage period
 months @ 3 to 20°C (stored in sealed pot)
 6
Load Resistor
 Ω (AFE circuit is recommended)
 33 to 100
Weight
 g
 < 6

Matched Transmitter board for SO2-A4 SO2 Sensor

Analogue Front End (AFE) Alphasense A4 Air Quality Sensors
The family of Analogue Front End (AFE) circuits are designed for use with the A4 air quality sensors. Connect the AFE with A4 sensors to your multtiplexed ADC and you are recording air quality data immediately.