Refrigerant leak detection – Freon (halocarbon) systems Which method is traditionally used to detect leaks in systems using Freon-type (halocarbon) refrigerants?

Introduction / Context:
Leak detection is essential for safety, performance, and environmental compliance in refrigeration systems. Different refrigerants require different detection methods because their chemical interactions with test media vary.

Given Data / Assumptions:

• System uses a halocarbon (e.g., R-12, R-22, R-134a family historically termed “Freon”).
• Traditional field methods considered (modern electronic detectors also exist).

Concept / Approach:
The classic method for halocarbon leaks is the halide torch. The torch flame changes color in the presence of halogenated refrigerant vapors drawn across a heated copper element, signaling a leak.

Step-by-Step Solution:
Identify refrigerant family: halocarbon (Freon-type).Recall detection methods: halide torch is specific to halogens and historically standard.Select the method best matched to Freon: halide torch.

Verification / Alternative check:
Soap-bubble tests can reveal any gas leak by bubble formation but provide no refrigerant specificity and are less sensitive for tiny leaks. Sulphur sticks react with ammonia, not with halocarbons; therefore they are unsuitable for Freon leaks.

Why Other Options Are Wrong:

• Sulphur sticks: used for ammonia (white fumes), not for halocarbons.
• Soap-and-water only: generic but not the traditional or most sensitive method for Freon.
• “All of these”: incorrect because sulphur sticks do not indicate halocarbon leaks.
• Acetylene flame color test: not a recognized safe practice for refrigerant detection.

Common Pitfalls:
Using sulphur sticks on halocarbon plants; ignoring modern electronic leak detectors which are now preferred for sensitivity and safety.

Final Answer:
Halide torch