Fixed natural gas detectors: alarm levels, interlocks and automatic supply shut-off

Fixed natural gas detectors operate continuously and can trigger alarms, ventilation, ESD, or supply shut-off valves.

First alarm level

Usually used for warning and activating specific actions according to the facility's safety logic.

Second alarm level

At a higher concentration, stricter action may be required, such as supply shut-off or equipment trip.

Interlocks

The gas detection panel can send signals to PLCs, BMS, fans, and emergency shut-off valves.

Fail-safe operation

The logic must account for what happens if power, communication, or a sensor signal is lost.

Testing

It is not enough to check only the sensor. It must be confirmed that the alarm also triggers the correct downstream actions.