A common refrigerant leak detection device is the:

• A. Micron gage.
• B. Halide torch.
• C. U-tube manometer.
• D. All of the above.

Answer: (B)

Leaks in refrigerant systems are often detected with tools that respond to halogens or to changes in pressure. The halide torch fits this purpose well because it detects halogen gases—the chlorine and fluorine components found in many common refrigerants—by causing the flame to take on an orange color when halogens are present. This immediate visual cue lets technicians pinpoint the leak location quickly on lines and joints.

A micron gauge, on the other hand, is used to measure how close a system is to a vacuum during evacuation; it isn’t a leak-detection tool by itself. A U-tube manometer measures pressure differences but is a general pressure indicator rather than a specialized refrigerant leak detector. So while those tools can provide information about leaks in a broader sense, they aren’t the typical, dedicated refrigerant leak detectors used in service work.