Enclosure for leak detector

A fire hydrant assembly comprising:

• a fire hydrant, the fire hydrant comprising a nozzle;
• a nozzle cap mounted on the nozzle;
• an enclosure attached to the nozzle cap;
• a vibration sensor positioned within the enclosure, the vibration sensor configured to detect vibrations travelling from the fire hydrant and through the nozzle cap and enclosure to the vibration sensor;
• and
• a circuit board positioned within the enclosure, the circuit board connected to the vibration sensor in electrical communication, the circuit board configured to process an electrical current transmitted by the vibration sensor.

A method of monitoring for a leak in a fluid system, the method comprising:

• mounting a nozzle cap assembly on a nozzle of a fire hydrant connected in fluid communication with the fluid system, the nozzle cap assembly comprising:
• a nozzle cap mounted on the nozzle;
• an enclosure attached to the nozzle cap;
• a vibration sensor positioned within the enclosure;
• and
• a circuit board connected to the vibration sensor in electrical communication;
• detecting a vibration from the fluid system with the vibration sensor;
• transmitting an electrical current from the vibration sensor to the circuit board;
• and
• processing the electrical current with the circuit board to determine if the leak is present in the fluid system.