A nozzle cap assembly includes a nozzle cap defining a bore, the bore defining internal threading configured to mount the nozzle cap on a nozzle of a fire hydrant; an enclosure attached to the nozzle cap; a vibration sensor positioned within the enclosure; a circuit board positioned within the enclosure, the circuit board connected in electrical communication with the vibration sensor, the circuit board configured to process an electrical current transmitted by the vibration sensor; and an antenna connected in electrical communication with the circuit board, the antenna configured to transmit a signal received from the circuit board.

Example aspects of a nozzle cap for a fire hydrant and a method of detecting a leak in a fluid system are disclosed. The nozzle cap for a fire hydrant can include an outer housing defining a first end, a second end opposite the first end, and a substantially circumferential wall extending from the first end to the second end; an antenna coupled to the substantially circumferential wall of the outer housing; a cap cover coupled to the outer housing at the first end; and an inner housing coupled to the outer housing at the second end.

Example aspects of a nozzle cap for a fire hydrant and a method of detecting a leak in a fluid system are disclosed. The nozzle cap for a fire hydrant can include an outer housing defining a first end, a second end opposite the first end, and a substantially circumferential wall extending from the first end to the second end; an antenna coupled to the substantially circumferential wall of the outer housing; a cap cover coupled to the outer housing at the first end; and an inner housing coupled to the outer housing at the second end.

An infrastructure monitoring assembly includes a nozzle cap defining an internal cavity; an antenna positioned at least partially external to the internal cavity; and the antenna covered with a non-metallic material. An infrastructure monitoring assembly includes a nozzle cap defining a first end and a second end, the first end defining a threaded bore configured to mount on a nozzle of a fire hydrant; a cover coupled to the nozzle cap opposite from the first end; an enclosure positioned at least partially between the cover and the first end, the enclosure at least partially defining a cavity; a monitoring device positioned within the cavity; and an antenna positioned between the cover and the first end of the nozzle cap, the antenna connected in electrical communication with the monitoring device, the antenna covered by a non-metallic material.

An infrastructure monitoring assembly includes a nozzle cap defining an internal cavity; an antenna positioned at least partially external to the internal cavity; and the antenna covered with a non-metallic material. An infrastructure monitoring assembly includes a nozzle cap defining a first end and a second end, the first end defining a threaded bore configured to mount on a nozzle of a fire hydrant; a cover coupled to the nozzle cap opposite from the first end; an enclosure positioned at least partially between the cover and the first end, the enclosure at least partially defining a cavity; a monitoring device positioned within the cavity; and an antenna positioned between the cover and the first end of the nozzle cap, the antenna connected in electrical communication with the monitoring device, the antenna covered by a non-metallic material.

An adapter cap for a fire hydrant including a hydrant actuation nut by means of which the hydrant is opened and closed by rotating the hydrant actuation nut, where the adapter cap includes a cap housing having connection means for connecting the adapter cap to the hydrant actuation nut, the cap housing having a cap actuation nut by which the adapter cap may be engaged and the cap housing including a skirt part arranged to encircle at least a part of the connection means, wherein a connection means centre axis of the connection means and a cap actuation nut centre axis of the cap actuation nut are arranged coaxially, wherein the connection means and the cap actuation nut are made from metal, and wherein at least a part of the skirt part is made from a polymer material, the adapter cap further includes at least one sensor arranged in the cap housing-(4), wherein the at least one sensor is arranged to detect at least one operational parameter of the hydrant , and wireless communication means arranged in the cap housing for communicating the at least one operational parameter wirelessly to an external data system .

An adapter cap for a fire hydrant including a hydrant actuation nut by means of which the hydrant is opened and closed by rotating the hydrant actuation nut, where the adapter cap includes a cap housing having connection means for connecting the adapter cap to the hydrant actuation nut, the cap housing having a cap actuation nut by which the adapter cap may be engaged and the cap housing including a skirt part arranged to encircle at least a part of the connection means, wherein a connection means centre axis of the connection means and a cap actuation nut centre axis of the cap actuation nut are arranged coaxially, wherein the connection means and the cap actuation nut are made from metal, and wherein at least a part of the skirt part is made from a polymer material, the adapter cap further includes at least one sensor arranged in the cap housing-(4), wherein the at least one sensor is arranged to detect at least one operational parameter of the hydrant , and wireless communication means arranged in the cap housing for communicating the at least one operational parameter wirelessly to an external data system .

An infrastructure monitoring assembly includes a housing mountable on a fire hydrant of an infrastructure system; and a sensor coupled to the housing, the sensor configured to sense at least one condition of a fluid within the infrastructure system. An infrastructure monitoring system includes a fire hydrant of an infrastructure system; a housing mountable on the fire hydrant of the infrastructure system; and a sensor coupled to the housing, the sensor configured to sense at least one condition of a fluid within the infrastructure system.

An infrastructure monitoring assembly includes a housing mountable on a fire hydrant of an infrastructure system; and a sensor coupled to the housing, the sensor configured to sense at least one condition of a fluid within the infrastructure system. An infrastructure monitoring system includes a fire hydrant of an infrastructure system; a housing mountable on the fire hydrant of the infrastructure system; and a sensor coupled to the housing, the sensor configured to sense at least one condition of a fluid within the infrastructure system.

Examples of a leak detection system are disclosed. In one example according to aspects of the present disclosure, a leak detection system includes a housing defining an interior, the housing connected to a component of a water distribution system. The leak detection system also includes a leak detection sensor contained within the interior of the housing and configured to detect a leak within the water distribution system. Additionally, the leak detection system includes a digital signal processing circuit in communication with the leak detection sensor.