When a refrigerant trace gas becomes absolutely necessary to identify a leak, which refrigerant should be used?

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When you need a trace gas to locate a leak, the goal is to introduce a small, detectable amount of a halogenated refrigerant so a leak detector can pick up its signature and guide you to the leak site. HCFC-22 is commonly used as this tracer because many portable leak detectors are calibrated to respond strongly to its halogen signature, giving a clear and reliable signal as you sniff around the system. This makes it the simplest and most practical choice for pinpointing leaks quickly. Other refrigerants might be detectable, but they can be less reliably detected by standard detectors or carry more regulatory or environmental concerns (for example, older CFCs are restricted, and some blends aren’t ideal for tracing due to detector sensitivity or policy).