Abstract: A method and system of non-intrusively monitoring the proportion of a component in a gaseous mixture having at least two components and contained in an electrical switchgear enclosure includes measuring the pressure, the temperature, and the density of the gas mixture by using sensors mounted on said enclosure, and in determining said proportion by processing the measured values in a data-processing unit.

Abstract: The method of non-intrusively monitoring the proportion of a component in a gaseous mixture having at least two components and contained in an electrical switchgear enclosure consists in measuring the pressure, the temperature, and the density of the gas mixture by means of sensors mounted on said enclosure, and in determining said proportion by processing the measured values in a data-processing unit.

Abstract: A circuit for automatically monitoring equipment, including a plurality of transducers for measuring operating parameters and providing data to a multiprocessor system comprising stations interconnected by a local network and constituting a distributed database, the system being capable of interchanging data with a higher level including a computer with a bridge connected to said network, wherein said bridge is a "terminal" microcontroller interchanging data with the stations via first messages corresponding to requests issued by the terminal and received by all of the stations in determined memory zones referred to as "first dedicated zones", and second messages corresponding to response from the interrogated stations and received by said terminal in determined memory zones, referred to as "second dedicated zones".