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Sulfur Dioxide


Alphasense Sulfur Dioxide gas sensors operate using proven fuel cell technology.

Sensors are available in the following sizes:

A: 20mm diameter, the industry standard size for portable gas detectors

B: 32mm diameter package, the best choice for fixed site applications

D: miniature, with proven long-term performance. Sensors designed for the next generation of 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

Application notes

Download Toxic Application Notes – see application notes for full details.

Sensor Specification Summary

Compare Alphasense Sulfur Dioxide sensors – sensor specification summary.

Data sheets

Go to downloads page

File Name Description Type Download Link
SO2-D4 Miniature Data Sheet
SO2-BF Compact, filtered Data Sheet
SO2-BE Compact, high-concentration Data Sheet
SO2-B4 Compact, 4-electrode, low-ppb Data Sheet
SO2-AF Small, filtered Data Sheet
SO2-AE Small, high-concentration Data Sheet
SO2-A4 Small, 4-electrode, low ppb Data Sheet


Staying at the forefront of sensor technology guarantees the best solutions for our customers



Each and every sensor is manufactured to the highest standards and tested for long-term reliability



Through investment and innovation we strive to exceed environmental and legislative targets


Download Data Sheets

Get data on our sensors Download Data Sheets

Download Application Notes

Get technical information Download Application Notes


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