Example aspects of a nozzle cap adapter, a nozzle cap assembly, and a method for method for mounting a nozzle cap to a fire hydrant nozzle are disclosed. The nozzle cap adapter can comprise an adapter ring defining a first adapter ring end, a second adapter ring end opposite the first adapter ring end, and an interior void extending from the first adapter ring end to the second adapter ring end; a nozzle connector extending from the second end of the adapter ring, the nozzle connector configured to rotatably engage a fire hydrant nozzle; and a latch coupled to the adapter ring and configured to removably lock the nozzle cap adapter onto the fire hydrant nozzle.

The hydrant monitoring system determines whether water is present in a dry-barrel fire hydrant. The hydrant monitoring system couples to a port of the hydrant using a hydrant port adapter. The hydrant monitoring system supports an operator interface unit mounted within a protective frame next to the hydrant on a fixed arm. A movable arm carries a distance sensor aimed downward that slides into and out of the hydrant on the fixed arm. The hydrant monitoring system is used by making a first distance measurement outside of the hydrant, making a second distance measurement inside of the hydrant, and subtracting the two to determine how far below ground level the bottom of the barrel is. If the bottom is not at a predetermined depth, a request to drain or service the hydrant may be initiated.

The hydrant monitoring system determines whether water is present in a dry-barrel fire hydrant. The hydrant monitoring system couples to a port of the hydrant using a hydrant port adapter. The hydrant monitoring system supports an operator interface unit mounted within a protective frame next to the hydrant on a fixed arm. A movable arm carries a distance sensor aimed downward that slides into and out of the hydrant on the fixed arm. The hydrant monitoring system is used by making a first distance measurement outside of the hydrant, making a second distance measurement inside of the hydrant, and subtracting the two to determine how far below ground level the bottom of the barrel is. If the bottom is not at a predetermined depth, a request to drain or service the hydrant may be initiated.

A nozzle cap assembly includes a body with a first curved side wall, the body defining a top end and a bottom end positioned opposite from the top end; a nut, the top end of the body positioned between the nut and the bottom end of the body; a spacer comprising a hollow body, the hollow body defining a curved outer surface, the spacer positioned between the nut and the bottom end of the body; and an antenna assembly coupled to the curved outer surface.

A nozzle cap spacer for a hydrant nozzle cap includes a spacer body defining an outer edge and an inner edge, the inner edge defining an opening formed through a center of the spacer body; and a leak path notch formed in the spacer body, the leak path notch extending radially inward from the outer edge of the spacer body.

A nozzle cap spacer for a hydrant nozzle cap includes a spacer body defining an outer edge and an inner edge, the inner edge defining an opening formed through a center of the spacer body; and a leak path notch formed in the spacer body, the leak path notch extending radially inward from the outer edge of the spacer body.

A nozzle cap assembly includes a body with a first curved side wall, the body defining a top end and a bottom end positioned opposite from the top end; a nut, the top end of the body positioned between the nut and the bottom end of the body; a spacer comprising a hollow body, the hollow body defining a curved outer surface, the spacer positioned between the nut and the bottom end of the body; and an antenna assembly coupled to the curved outer surface.

A nozzle cap assembly can include a nozzle cap body defining a top end and a bottom end, the nozzle cap body defining a base positioned at the top end and a curved side wall extend from the base down to the bottom end; an enclosure coupled to the top end, the enclosure rotationally fixed relative to the nozzle cap body, the enclosure at least partially defining an enclosure cavity; and a nut base positioned opposite from the nozzle cap body, the enclosure positioned between the nut base and the base.

A nozzle cap assembly can include a nozzle cap body defining a top end and a bottom end, the nozzle cap body defining a base positioned at the top end and a curved side wall extend from the base down to the bottom end; an enclosure coupled to the top end, the enclosure rotationally fixed relative to the nozzle cap body, the enclosure at least partially defining an enclosure cavity; and a nut base positioned opposite from the nozzle cap body, the enclosure positioned between the nut base and the base.

A nozzle cap spacer for a hydrant nozzle cap includes a spacer body defining an outer body edge, the spacer body defining a spacer body thickness; and a resilient first spacer spring arm extending from the outer body edge and biased away from the spacer body in an extended orientation, wherein the first spacer spring arm defines a first spring arm thickness; wherein the first spring arm thickness of the first spacer spring arm is equal to the spacer body thickness of the spacer body.