Refrigerant leakage detection

Maximum safety with minimal total cost of ownership


Frequent false alarms lead to operational disruptions and increased costs for the end user. The SGD4x is unaffected by dust and is factory calibrated for a 15+ year maintenance-free lifetime.


Sensirion has spent over twenty years developing, miniaturizing, and mass-producing thermal conductivity sensors for various markets. The SGD4x ensures fast response times and long-term stable measurements, even in the harshest environments.


Sensirion’s A2L solution is optimized for cost and performance. Based on the well-established thermal conductivity principle, our elegant design provides repeatable measurements, has no moving parts, and clears the path for further miniaturization and cost-reduction.

A2L and A3 refrigerant sensors

Our compact sensing elements offer flexibility in end-user applications and our technology ensures high reliability over the entire lifetime. Benefit from maximum safety, and minimal cost of ownership.

Thermal conductivity based sensors in use in millions

Leading suppliers in the field of building automation have been relying on Sensirion’s highly accurate and reliable air flow controllers for years.

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Specialist article

Market trends in refrigerant leakage detection

To reduce environmental impact, the use of many common refrigerants has been restricted in recent years. The Heating, Ventilation, Air Conditioning, and Refrigeration industry are under increasing pressure to carefully select refrigerants, moving away from widely-used hydrofluorocarbons in favor of refrigerants with lower Global Warming Potential.

Trend topic

Indoor air quality

In recent years, a new demand for clean air has developed among many people who value healthy living. When it comes to air quality, most of them rightly are worried about atmospheric pollution, but tend to forget about indoor air pollution.