Sulfur dioxide SO2 sensors

To measure the concentration of SO₂ sulphur dioxide in the air

Sulphur dioxide (SO₂) is produced, for example, by the combustion of fossil fuels and in industry. It can be present in building materials, dyes, micro-organisms or vulcanised rubber. It also occurs in nature in volcanic gases or in underground mineral waters. It is a colourless, poisonous gas with a pungent smell. Due to the character of this gas, it is better to place the sensors at the bottom of the measured area, as sulphur dioxide is heavier than air.

Measurement of sulphur dioxide (SO₂) is often used in the following areas:

• In museums and depositories where sulphur dioxide (SO₂) is measured as a pollutant acting on metals, especially iron and copper, where it causes corrosion. SO₂ is also often monitored in paintings where it causes darkening and discolouration. In the case of leather and textile preservation, sulphur dioxide causes disruption of the fibre and strength of textiles.
• In industry and production, sulphur dioxide (SO₂) is measured mainly in the context of health protection. In the production of some products, dyes and vulcanised rubber, SO₂ can increase its concentration in the air.
• In thermal baths, where sulphur dioxide is formed by evaporation from underground mineral waters. This gas is harmful to human health, it is necessary to ensure suitable air recuperation and measurement of SO₂.