Sensor Solutions for Natural Refrigerants

HSI Sensing is proud to provide ideal reed sensor solutions for the transition in refrigeration from hydrofluorocarbons (HFCs) hydrochlorofluorocarbons (HCFCs), and chlorofluorocarbons (CFCs) to natural refrigerants such as hydrocarbons (propane, butane, and cyclopentane), CO2, ammonia, water and air.

See the challenges faced when using natural refrigerants:

HSI offers true hermetically sealed proximity & limit sensing solutions thereby eliminating exposure of combustible materials to electrical contacts. Our Sensors our used to detect movement, proximity, metal detection and flow measurement and liquid level.

BENEFITS of Hermetically Sealed Sensors

– 100% true hermetic seal (1stlevel: Complete encapsulation of reed switch using housing/epoxy system; 2ndlevel: glass-to-metal seal isolating electrical contacts from all exterior influences)

– Our sensors operate without any physical touch, and therefore eliminating the housing penetrations required in sensors that utilize push buttons or levers. This feature also eliminates the need to physically align, adjust, and accommodate the moving levers and parts associated with traditional limit switches.

– The electrical contacts and moving components of competing products can be affected by dust and moving parts.  With a true hermetically sealed product there is no chance of outside particles contaminating the electrical contacts surfaces.  The result of this enhanced design gives you a product that will operate for millions of cycles when used according to the proper electrical ratings.

-Our sensors are cable of operating in temperatures as low as negative 60 degree Celsius and as high as 200 degrees Celsius.

-The sensor and actuator can be custom engineered for unique applications to meet needs in mounting, space requirements, wire lengths, custom connectors, operate distances, etc.

Potential Standard Solutions:

PRESS FIT: PRX+1100, PRX+1200, PRX+1300,


SURFACE MOUNT: PRX+8300, PRX+8500, PRX+8510,


Refrigerant Deadlines

– “Among the HFCs and HFC-blend refrigerants affected by the regulations are several that are familiar to facility managers: R-404A, R-134a, and R-410A and R-407C, used to replace R-22.

– Under the rules, new chillers would no longer be produced using these refrigerants after Jan. 1, 2024.

– As well, HCFCs (hydrochlorofluorocarbons) were part of the solution when CFCs were being phased out. HCFCs had far lower ozone depletion potential than CFCs, but they were always seen as an interim solution because they contained ozone destroying chlorine.

– Two HCFC refrigerants are widely used in commercial cooling: R-123 and R-22. R-123 will be phased out for new HVAC equipment on Jan. 1, 2020; it will continue to be produced for servicing equipment until 2030. R-22 cannot currently be produced for use in new equipment; all production and import of new R-22 will end in 2020.

– The change “does not impact any chillers sold before 2024 and does not impact servicing or maintenance,” says Jay A. Kohler, director of technology and innovation, chiller solutions, Johnson Controls.”–17286