Method and device for recording characteristic state, amount and composition of a flowing medium

Method and device that by acoustic signal energy-generated by a flowing medium, detects characteristic properties, amounts and the individual distribution between several components/phases, i.e. liquids, gases, particles or any distribution individual and between these. The flowing medium is decided to pass through at least one in a pipe system installed flow conditioner that has at least one restriction and by said passing is decided to release acoustic signal energy. The flow conditioner is installed in such a way that it in an acoustic and/or thermal way is totally or partly isolated from upstream and downstream adjoining sections of the pipe system and/or surrounding construction details.