Ensuring Safety with A2L Refrigerant Sensors: a Q&A with Bob Annesley, Sales Director at Posifa Technologies

Bob Annesley, Sales Director at Posifa Technologies, recently addressed questions regarding the PGS6000 family of A2L refrigerant sensors. In this discussion, he elaborated on the key features, applications, and competitive advantages of these sensors, as well as their importance in the evolving HVAC and refrigeration industries. 
  • What problem is the PGS6000 sensor designed to solve?
Bob Annesley:  The PGS6000 sensor addresses the issue of A2L refrigerant leaks, which are mildly flammable gases. At certain concentrations, these gases become flammable, and our sensor is designed to detect such leaks. It can warn people or initiate avoidance actions, such as shutting down a compressor in an HVAC unit while keeping the fans running until the environment is safe. This ensures that maintenance personnel are alerted, and the system can resume operation once it is safe.
  • Why was there no need for such sensors before?
Bob Annesley:  Previously, non-flammable refrigerants were used, so leaks were less of a concern. However, with the transition to A2L refrigerants, which are mildly flammable, the need for detection and safety measures has increased.
  • Who are the primary users of these sensors?
Bob Annesley:  The primary users will be HVAC and refrigeration manufacturers. This includes companies like Carrier and Frigidaire. The mandate for these sensors is global, with Europe leading the way, followed by the Americas and other manufacturing hubs like China and Japan.
  • How quickly does the PGS6000 sensor detect A2L refrigerants, and what actions does it trigger? 
Bob Annesley:  The detection time, or response time, is sub-10 seconds. This rapid detection allows for immediate action, such as shutting down the compressor while keeping the fans running to disperse the gas. Some systems might include a relay output or a mitigation board to decide the appropriate response.
  • Are there existing A2L sensors that the PGS6000 competes with?
Bob Annesley:  Yes, there are several competitors, including Sensata and Nevada Nano. Additionally, there are NDIRtechnology-based sensors.