AC supply fluid meter

A fluid meter configured to perform metrological measurements in a fluid circulation pipe and to communicate information relating to said metrological data, comprising:

• an electric generator configured to be driven by the circulation of the fluid in the fluid pipe and to generate electricity,
• at least one metrological sensor configured to perform metrological measurements in the fluid pipe,
• a control block configured to receive the metrological measurements and to communicate information relating to said metrological data,
• a power supply block coupled to the electric generator, and configured to supply energy to the control block, in which the power supply block comprises a first supply path comprising at least one primary cell, and a second supply path connected to the electric generator, the second supply path comprising a capacitor and a first switch configured to selectively couple the capacitor and the electric generator, the power supply block further comprising a second switch configured to selectively couple the first supply path or the second supply path to the control block,
• the power supply block further comprising a current sensor configured to determine a current measurement representative of an intensity of a charge or discharge current of the capacitor,
• the first switch and the second switch being configured to be monitored by the control block according to a state of charge of the capacitor determined by the control block from the current measurement.