What characteristic should combustible gas indicators possess according to NFPA 54?

The characteristic that combustible gas indicators should possess, as outlined by NFPA 54, is a numerical display from 0 to 100 percent. This specification is important because it allows users to accurately gauge the concentration of combustible gases in the environment. A numerical display provides a clear and quantifiable measurement, making it easier for operators to assess potential hazards.

Understanding the actual percentage of gas concentration is crucial for taking appropriate safety measures. This format enables personnel to make informed decisions about ventilation, evacuation, or other safety protocols necessary to mitigate risks associated with combustible gas exposure.

Other forms of indications, like color-coded warning lights or audible alarms, may provide useful alerts or information but do not offer the precise numerical assessment required for effective hazard management. Similarly, while wireless connectivity could enhance functionality by allowing remote monitoring, it does not directly influence the device's primary role of detecting and measuring gas concentrations. Thus, the requirement for a numerical display is key for safety and effectiveness in gas detection.