PGS6000 MEMS Thermal Conductivity Sensors for A2L Refrigerant Leaks

PGS6000 series sensors accurately detect A2L refrigerant concentration in the air by measuring the change in thermal conductivity of the gas mixture inside the cabinet. This technology increases safety and efficiency by enabling early detection of leaks, while providing long-term reliability of 15 years or more in harsh environments. 

The PGS6000 series uses Posifa's second-generation MEMS thermal conductivity sensing element. It features a patented “heat transfer cavity” that achieves highly sensitive and repeatable thermal conductivity measurement by eliminating possible occurrences of natural convection inside the cavity. As thermal conductivity measurement is accomplished completely inside the sensor chip, maximum miniaturization can be realized at the device level — a critical capability for HVAC equipment manufacturers who must retrofit the sensors into existing designs. 

The sensors are designed with a relative humidity sensor and a barometric pressure sensor. This strategic incorporation enables the detectors to compensate for thermal conductivity changes influenced by variations in humidity and barometric pressure, enhancing the accuracy of A2L refrigerant concentration measurement. The PGS6000 series detects R32 and R454B refrigerants, and supports RS485 MODBUS RTU output.   

Key Features:

• Humidity and pressure compensated 
• Remain accurate in harsh environments 
• Non-reactive to "poisons" or contaminants 
• Long-term stability 
• Long-term reliability > 15 years 
• Enable miniaturization 
• Fast response time < 250 ms 

Target Applications:

• Residential and commercial air conditioning 
• Heat pumps 
• Refrigeration equipment 

Absolute Maximum Ratings

• Operating temperature: -40 °C to 85 °C 
• Storage temperature: -40 °C to 90 °C 
• Supply voltage: 5.5 Vdc