
A3 Gas sensor
DST G-series gas sensors by Danfoss Sensing Solutions are used to detect A3 refrigerant gases and support safety, compliance, and reliable operation in HVAC and refrigeration systems. In cold room systems, they are relevant where A3 refrigerants are part of the refrigerant strategy and gas detection is needed to support safer system design and operation.
This category range is also used outside cold rooms in industrial heat pumps, general HVAC applications, and broader refrigeration use cases where A3 refrigerants such as propane or isobutane are used
Features and benefits
- Fast and accurate leak detection
- Compact sensor design for easier system integration
- Long service life with no field calibration during normal product lifetime
- Reliable self-diagnostics to reduce the risk of silent failures
- Immunity to poisoning
- Reduced false-alarm risk through selective detection and dew point avoidance
- Strong resistance to harsh environments, including dust, oil, water spray, UV exposure, and thermal cycling
- Flexible hardware and software integration for different system requirements
Product types shown: 1

DST G290 & DST G600
The new A3 gas sensor is designed for use in industrial heat pumps and general HVAC applications.
Accurate and compact leak detector designed based on IEC 60355-2-40 compatible to customer’s application specifications, both hardware and software.
Photoacoustic technology offers minimum 15-year lifetime, immunity to poisoning, fast response time and reliable self-diagnostics.