XENSIV™ TCI-R gas sensor, a A2L refrigerants leakage sensor based on the thermal conductivity principle The XENSIV™ TCI-R gas sensor detects leaks quickly and reliably by measuring changes in thermal conductivity specific to refrigerants like R32, R454A-B-C, R455A, R1234yf. Its fast response prevents compressor damage, loss of cooling efficiency, and regulatory noncompliance. Thanks to its low drift and resistance to cross-sensitivity or poisoning, it maintains accuracy over years of operation, reducing maintenance costs and environmental impact.