Which two tools are primarily used for detecting small leaks of ammonia?

The correct answer is a combination of an ultrasonic leak detector and a smoke pencil. These tools are specifically designed for identifying small leaks in systems containing gases like ammonia.

An ultrasonic leak detector functions by sensing high-frequency sounds that are created by pressurized gas escaping from a leak. Ammonia, being a volatile substance, creates sound waves that can be detected, even from small leaks, making this tool particularly effective for such applications.

A smoke pencil, on the other hand, generates a thin, controlled stream of smoke that visually outlines airflow and can help indicate the presence of leaks. When using a smoke pencil near a suspected leak, the smoke will be disturbed or drawn into the leak, providing a clear visual cue of the leak’s location.

The incorrect options encompass tools that do not specialize in leak detection for ammonia. For instance, thermometers and manometers are used for measuring temperature and pressure, respectively, but they do not provide the specific detection capabilities needed for small gas leaks. Similarly, an ammeter measures electrical current, and a pressure gauge assesses pressure levels, neither of which is appropriate for locating or identifying gas leaks. Sulfur sticks and pH paper are more relevant for chemical detection or analysis rather than for detecting gas leaks directly.