Fluid meter arranged to detect a leak and to make an installation safe

A fluid meter, comprising:

• a first communication interface communicating via a radio link with a communication interface of a cut-off unit, which is remotely positioned outside of the fluid meter, comprising an electromechanical valve, and also transmitting electrical energy via the radio link, the electrical energy powering the communication interface of the cut-off unit, such that the communication interface is not powered by a battery of the cut-off unit but only by the electrical energy transmitted by the radio link;
• a first processor module arranged:
• to evaluate a flow rate of fluid being supplied to an installation connected to the fluid meter and, if the flow rate of fluid remains greater than a first predetermined flow rate threshold for at least a first predetermined duration, to detect that there is a leak of fluid in the installation and transmit an internal command frame via the first communication interface to the communication interface of the cut-off unit, the internal command frame incorporating a closing command in order to close the electromechanical valve;
• and
• following closing of the electromechanical valve, to acquire a first external command frame via the first communication interface, the first external command frame incorporating an opening command and being produced by the cut-off unit following a manual action on an actuator member of the cut-off unit, to produce an internal command frame incorporating the opening command, and to transmit said internal command frame via the first communication interface to the communication interface of the cut-off unit in order to reopen the electromechanical valve.