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Commercial Refrigeration: A Guide to A2L Refrigerant Detection Sensors

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Flow into A2L with efficient gas sensors for HVAC and Commercial refrigeration systems

Flow into A2L refrigerant gas detection with the new DST Gxxx refrigerant detection sensors by Danfoss Sensing Solutions, built with performance and reliability at the forefront. Detecting refrigerant leaks is crucial for maintaining system efficiency and preventing costly damage.

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Commercial refrigeration systems are crucial for maintaining the quality and safety of both food and beverages. These systems ensure that perishable items are stored at the right temperatures to prevent spoilage and extend shelf life. They are widely used in various industries, including supermarkets, convenience stores, and food companies.

To find commercial refrigeration systems, businesses often look at the types of systems available, such as rack refrigeration systems and walk-in coolers, and consider key parameters for choosing the right system.

When selecting a new system, businesses must consider factors such as space requirements, types of storage, and cost implications. This ensures that the chosen system meets their specific needs and operates efficiently

Introduction to Commercial Refrigeration Systems

Commercial refrigeration systems are essential for food and beverage companies, convenience stores, and other businesses that require precise temperature control to maintain the quality and safety of their products. These systems are designed to remove heat from a specific area, keeping perishable goods at a consistent temperature. Commercial refrigeration equipment is used in a variety of applications, including walk-in coolers, walk-in freezers, and refrigerated display cases. The goal of a commercial refrigeration system is to provide a reliable and energy-efficient solution for maintaining the desired temperature, while also ensuring compliance with food safety regulations. By maintaining the right temperature, businesses can ensure the freshness and safety of their products, ultimately protecting their reputation and bottom line.

DST Gxxx A2L refrigerant detection sensors

DST Gxxx A2L gas detection sensors feature a revolutionary inverted design, which protects the sensor in harsh environments, supporting 5 different A2L refrigerants with the option of additional refrigerants added upon demand. Using Thermal conductivity, a field proven technology, our sensors meet the requirements for HVACR equipment.

With patented top-down design that protects sensors from all common contaminants you can get 15+ years of performance as estimated per our extensive internal testing. In rack refrigeration systems, multiple compressors work together to achieve efficient cooling. Metering devices play a crucial role in maintaining the desired temperature by decreasing the pressure of the refrigerant. Proper installation and calibration are essential to ensure the system operates efficiently.

Prioritize safety, reduce maintenance and ensure supply

Proven high-speed thermal conductivity sensors delivers excellent response time, ensuring maximum safety for users and equipment. Certain gas detection systems, such as the MGS-410 and MGS-460, simplify compliance with refrigeration safety codes, making it easier for users to adhere to regulations. And as a leading tech developer with in-house production, Danfoss offers a resilient supply chain, ensuring to meet your demands and maintain a steady delivery to support your business growth.

Features and benefits

Versatility

Flexible design, suitable for applications use with R454B and R32 refrigerants (DST G200 only). Maintaining door seals is crucial to retain cool air within the refrigeration units, preventing warm air from entering and ensuring optimal performance.
Rapid and Accurate Leak Detection

Compensated over full range of temperature, humidity, and pressure ranges, ensuring accurate leak detection across various temperatures.
Eliminate False Alarms with Dewpoint Avoidance

Dewpoint monitoring and heated enclosure prevents condensation in the housing.
Immune to Dust, Oil and Water Spray

Strategic, patent-pending sensor positioning using diffusion flow principles protects sensor from exposure.
UV Protected

All exposed materials are impervious to sustained UV exposure.
No Field Service Requirements
Permanent factory calibration. No field adjustments or re-zeroing during 15+ year life as estimated per our extensive internal testing.
Minimized “Silent” Failures
Robust “full signal chain” diagnostics check for faults and integrity of signal chain.
Easy System Integration
Flexible hardware and software to customer’s application specifications.

Articles

Thermal conductivity: the best technology for the A2L HVACR market

This whitepaper answers two key questions: why thermal conductivity is the best technology for quickly and accurately detecting A2L gas leaks and how product design impacts a thermal conductivity sensor’s effectiveness and durability.

Download white paper

Applications

The DST Gxxx A2L Refrigerant detection sensors are designed with focus on:

HVAC
Computer Room Air Conditioners (CRAC) units, Residential and Commercial Heat Pumps, Rooftops and A/C Scroll chillers.
Commercial refrigeration
Cold rooms, display cabinets, compressor racks/packs.
Coil manufacturers
System builders requiring a dual refrigerant gas sensor.
Other industries
With applications using A2L refrigerants.

Documents

Documents
Type	Name	Language	Valid for	Updated	Download	File type
Data sheet	A2L Gas Sensor, Types DST G54A, DST G54C, DST G55A	English	Multiple	27 Oct, 2025	801.0 KB	.pdf
Data sheet	A2L Gas Sensor, Types DST G54B, DST GR32	English	Multiple	24 Oct, 2025	846.0 KB	.pdf
Installation guide	A2L Gas Sensors, Relay, MODBus and Dual Output	English	Multiple	22 Aug, 2023	425.0 KB	.pdf
Installation guide	A2L Gas Sensors, Relay, MODBus and Dual Output	French	Multiple	13 Nov, 2024	418.8 KB	.pdf
Brochure	DST G-series A2L refrigerant detection sensors brochure	Spanish, Castilian	Spain	11 Mar, 2025	1.0 MB	.pdf
Brochure	DST G-series gas sensors brochure	English	Multiple	06 Feb, 2026	509.2 KB	.pdf
White paper	Thermal conductivity: the best technology for A2L HVACR market	English	Multiple	16 Jan, 2024	3.4 MB	.pdf

Approvals

CE marked
RoHS compliant
UL 60335-2-40
UL 60335-2-89

Highlighted products

DST G200 - Dual refrigerant gas detection sensors for HVAC equipment

The latest addition to the DST G-series is the DST G200 dual refrigerant gas sensor, developed to detect for R454B and R32 refrigerant type, perfect for coil manufacturers and system builders, looking to reduce complexity while gaining flexibility in building A2L refrigerant compatible systems. These sensors meet the requirements of UL standards for HVAC equipment. Walk-in refrigerators, known for their large size, robust structure, and precise temperature applications, are essential in storing various items like food and pharmaceuticals.

DST G54A, DST G54C and DST G55A - A2L Refrigerant gas detection sensors for Commercial refrigeration equipment

Using field proven technology, Danfoss Sensing Solutions has developed the DST G54A, DST G54C and DST G55A A2L refrigerant gas sensors for R454A, R454C and R455A refrigerant type that meet the performance and reliability required to carry the company name. These sensors meet the requirements of UL 60335-2-89 for refrigeration equipment.

DST G54B and DST GR32 - A2L Refrigerant gas detection sensors for HVAC equipment

Using field proven technology, Danfoss Sensing Solutions has developed the DST G54B and the DST GR32 A2L refrigerant gas sensor for R454B and R32 refrigerant type that meet the performance and reliability required to carry the company name. These sensors meet the requirements of UL 60335-2-40 for HVAC equipment.

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