Sulfur Dioxide Sensor (SO2 Sensor) 4-Electrode - SO2-A4

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Product Overview


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
SensitivitynA/ppm at 2ppm SO2320 to 480
Response timet90 (s) from zero to 2ppm SO2< 20
Zero currentnA in zero air at 20℃5 to 45
Noise*±2 standard deviations (ppb equivalent)15
Rangeppm limit of performance warranty50
Linearityppb error at 20ppm SO2 , linear at zero and 2ppm SO20 to -5
Overgas limitmaximum ppm for stable response to gas pulse100
* Tested with Alphasense AFE low noise circuit
SO2-A4 Sulfur Dioxide Sensor SO2 Sensor LIFETIME
Zero driftppb equivalent change/year in lab air< ±20
Sensitivity drift% change/year in lab air, monthly test< ±15
Operating lifemonths until 50% original signal  (24 month warranted)> 36
SO2-A4 Sulfur Dioxide Sensor SO2 Sensor ENVIRONMENTAL
Sensitivity @ -20℃(% output @ -20℃/output @ 20℃) @ 2ppm SO280 to 95
Sensitivity @ 50℃(% output @ 50℃/output @ 20℃) @ 2ppm SO290 to 105
Zero @ -20℃nA change from 20℃< ± 25
Zero @ 50℃nA change from 20℃150 to 300
SO2-A4 Sulfur Dioxide Sensor SO2 Sensor CROSS SENSITIVITY
Filter capacityppm·hrs450
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-30 to 50
Pressure rangekPa80 to 120
Humidity range% rh continuous (see note below)15 to 90
Storage periodmonths @ 3 to 20℃(stored in sealed pot)6
Load ResistorΩ (AFE circuit is recommended)33 to 100
Weightg< 6



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