Which instrument detects leaks by measuring the change in the resistance of a refrigerant vapor?

Which instrument detects leaks by measuring the change in the resistance of a refrigerant vapor?

• A. Manometer
• B. Electronic leak detector
• C. Vacuum gauge
• D. Thermometer

Answer: (B)

The electronic leak detector is designed to identify refrigerant leaks by measuring the changes in resistance caused by the presence of refrigerant vapor in the air. This instrument utilizes sensors that respond to the specific properties of refrigerant gases, allowing it to detect even minute concentrations. As refrigerant escapes from a system, it dilutes in the ambient air, which leads to measurable changes in electrical resistance. This capability makes electronic leak detectors a preferred choice for HVAC professionals when maintaining or repairing refrigeration systems, as they provide a reliable method for locating leaks and ensuring system integrity. The other instruments, while useful in various HVAC applications, do not serve the same function. A manometer measures the pressure of gases or liquids, a vacuum gauge is used for assessing the level of vacuum in a system, and a thermometer measures temperature. None of these instruments are capable of detecting refrigerant vapor or measuring changes in resistance in the context of leak detection.

The electronic leak detector is designed to identify refrigerant leaks by measuring the changes in resistance caused by the presence of refrigerant vapor in the air. This instrument utilizes sensors that respond to the specific properties of refrigerant gases, allowing it to detect even minute concentrations. As refrigerant escapes from a system, it dilutes in the ambient air, which leads to measurable changes in electrical resistance. This capability makes electronic leak detectors a preferred choice for HVAC professionals when maintaining or repairing refrigeration systems, as they provide a reliable method for locating leaks and ensuring system integrity.

The other instruments, while useful in various HVAC applications, do not serve the same function. A manometer measures the pressure of gases or liquids, a vacuum gauge is used for assessing the level of vacuum in a system, and a thermometer measures temperature. None of these instruments are capable of detecting refrigerant vapor or measuring changes in resistance in the context of leak detection.