The fixed systems for gas detection in the industry in general are systems that are basically composed of a set of elements that allows the detection and sending of a specific gas signal. These systems have 2 fundamental parts: the sensor which detects the gas and the transmitter which interprets the signal and allows it to be carried to other devices to control a process or to have information on the value of the variable that is being measured. These systems can include from 1 monitoring point to hundreds of points which can be integrated in dedicated controllers for this purpose where the concentrations and alarms can be reported. These fixed systems can integrate transmitters and sensors of different types and with different measurement principles, all connected to a controller or central unit where the signal of each measurement point arrives, in this way the alarms are in real time and the presence of some unwanted gas is alerted. Likewise these controllers allow the connection of signals to other centralized control systems or elements such as PLC, also by means of relays they allow to generate a specific action when there is a special concentration condition of the target gas.