What is the primary function of a Combustible Gas Indicator (CGI)?

The primary function of a Combustible Gas Indicator (CGI) is to measure the concentration of combustible gases in the atmosphere. This instrument is essential for detecting the presence of flammable gases, which can pose significant risks in various environments, especially in hazardous material incidents and confined spaces.

By providing real-time readings of gas concentration levels, the CGI helps technicians and responders assess the risks associated with combustible gases and make informed decisions regarding safety measures and necessary actions to mitigate potential hazards. Monitoring these levels is crucial to prevent explosive atmospheres, which can lead to accidents or catastrophic failures.

The other choices do not align with the CGI's specific capabilities. Toxic substance detection, oxygen level indication, and pH evaluation are carried out by different specialized instruments designed for each task, demonstrating that the CGI uniquely focuses on combustible gases.