🔍 Key Concepts
• Different methods of refrigerant leak detection (halide torch, electronic sniffer, ultrasonic, UV/black‑light with dye)
• How a fluorescent dye is made visible inside a closed system
• The role of a UV or black light in detecting that dye
💭 Think About
• Look at each device and ask: does this tool "sniff" the air, listen for sound, burn gas, or shine light? Which one would need something added to the refrigerant so it can be seen?
• If a detector depends on seeing a glow rather than smelling, burning, or hearing a leak, what extra step must be done to the system beforehand?
• Which illustration clearly shows equipment designed mainly as a light source rather than a sensor or burner?
✅ Before You Answer
• Identify which option is a UV/black‑light style lamp, not a sensor probe or torch
• Confirm that fluorescent dye must be mixed with the system’s refrigerant so it can leak out and glow under UV light
• Eliminate devices that work by burning gas, electronic sniffing, or ultrasonic listening, since these do not require dye in the system