Halogen Leak Detectors

Heated diode sensors are lower cost and widely used but can give false positives from oils, solvents, and other contaminants commonly present in field service environments. Infrared sensors are more selective to actual refrigerant gas and resist those false alarms better, generally at a higher purchase cost — a worthwhile tradeoff for technicians working in consistently dirty conditions.

Not automatically — sensor response varies by refrigerant chemistry, and older detectors calibrated primarily for legacy refrigerants like R22 or R410A may have reduced sensitivity to newer low-GWP blends. Check the manufacturer's compatibility list for your specific detector model against the refrigerants you service before relying on it for those systems.

Sensor tip life varies by usage and exposure to contaminants, but most manufacturers recommend replacement anywhere from every 100 hours of use to annually — reduced sensitivity or slow response is usually the practical sign it's time to replace, and manufacturers typically publish a specific service interval to follow.

EPA refrigerant management regulations set allowable annual leak rates by system type, and detector sensitivity should be capable of detecting leaks well below that threshold — check the current regulatory leak-rate requirement for your system category and choose a detector rated to detect leaks at or below that oz/yr threshold with margin.

Standard halogen leak detectors are specifically designed for halogenated refrigerant gases and won't reliably detect other gases like natural gas, propane, or ammonia — those require a combustible gas detector or ammonia-specific detector. Some combo units on the market do detect multiple gas types, so confirm the specific detection range if you need coverage beyond refrigerants.