A gas flow detector is a device designed to sense and monitor the presence and movement of gas within a system or pipeline. Unlike flow meters that provide quantitative measurements, gas flow detectors are primarily used to detect whether gas is flowing or not, and to trigger alerts or control actions based on that status. They play a vital role in safety systems, helping to prevent leaks, ensure proper operation of gas-fed equipment, and maintain process integrity. Commonly used in industrial plants, laboratories, and HVAC systems, gas flow detectors contribute to both operational reliability and workplace safety.