What should the gas detector automatically do when it senses gas?

When a gas detector senses gas, it is crucial for safety systems to react promptly and effectively to mitigate potential hazards. The most appropriate response is for the system to stop the compressor and activate audible or visual alarms. This approach serves multiple purposes: it immediately halts further gas release by stopping the compressor, which could potentially exacerbate the situation, and it alerts personnel in the vicinity through alarms.

Stopping the compressor is vital as it prevents additional gas from being released into the environment, which could lead to hazardous conditions. The activation of alarms ensures that all personnel within the area are notified of the danger, prompting them to take necessary precautions. This dual response of stopping operations and alerting individuals is critical in maintaining safety and minimizing the risks associated with gas leaks.

Ventilation, while important in certain contexts, does not directly address the immediate danger of an active gas leak. Shutting down the entire system can be overly drastic and might not be necessary in all scenarios, potentially disrupting operations unnecessarily. Simply alerting the operator may not provide adequate safety measures, as immediate action is required to prevent escalation of the situation. Therefore, the response of stopping the compressor and engaging alarms is the most appropriate and effective safety measure.