Which method is used to pinpoint the exact leak after the general area has been identified?

• A. Soap bubbles
• B. Dye tracer
• C. Infrared imaging
• D. Ultrasonic testing

Answer: (C)

Focusing on locating leaks quickly and precisely after you’ve identified the general area relies on detecting temperature differences caused by the escaping gas or refrigerant. Infrared imaging uses a camera that senses infrared radiation and turns it into a thermal image. When a leak occurs, the escaping fluid often alters the surface temperature around the leak site, creating a distinct hot or cold spot. By scanning the suspected region with an infrared camera, you can pinpoint the exact location of the leak without dismantling components, guiding a targeted repair.

Soap bubbles can show a leak point where you apply soap solution, but they require contact with the surface and a visible, accessible path for bubbles. Dye tracer needs introducing dye into the system and waiting for it to appear at the leak, which can take time. Ultrasonic testing detects the sound of escaping gas, which can indicate a general area but may be less precise about the exact spot in some environments. Infrared imaging provides a fast, non-contact way to zero in on the exact leak location.