Alabama Journeyman Gas Fitter Practice Exam

A gas leak detector is specifically designed to identify the presence of combustible gases, including those typically found in natural gas lines. These detectors can sense even small concentrations of gas in the air and provide an audible or visual alarm, allowing for quick action to prevent potential hazards such as explosions or fires. Their sensitivity and specificity make them the primary tool for ensuring safety when working with gas systems.

In contrast, a pressure gauge measures the pressure within gas lines but does not indicate whether gas is leaking. A flow meter quantifies the flow rate of gas, and while it can suggest issues with gas supply, it does not directly detect leaks. A voltage tester checks for electrical current in circuits and is unrelated to gas detection. The application and function of a gas leak detector make it indispensable for detecting gas leaks effectively.