Abstract: A flow meter alarm device easily attached to and removed from a flow meter at various locations along the length of the flow meter. The device is compatible with flow meters which have a float for measuring flow velocity. The device preferably has two housings, extending from a third housing having a display surface, that define an area for receiving a flow meter. The extending housings are preferably drawn together by a threaded member thereby clamping the device onto the flow meter. A sensor mounted on the device, preferably an optical emitter coupled with an optical receiver, is able to detect the float. When the float is detected, a signal is produced by the device notifying that the flow rate has fallen outside a desired range. The device is adjustable to function with flow meters of various different dimensions.

Abstract: A flow meter having a float slideably mounted along a float rod centrally located within a flow meter body, the float assuming a height along the flow meter float rod representative of fluid pressure. The float preferably has a cylindrical-shaped through-bore. The float rod preferably has a polygonal-shaped perimeter over substantially its entire length permitting fluid flow between the float rod outer diameter (OD) and the float inner diameter (ID) to dislodge any particulate, thereby serving a self-cleaning function. The float rod is preferably hollow and closed at its upper end and having flow inlet and flow outlet openings near its lower end communicating with a flow chamber which conveniently provides the inlet and outlet flows at the lower end of the flow meter.

Abstract: A flow meter having a float slideably mounted along a float rod centrally located within a flow meter body, the float assuming a height along the flow meter float rod representative of fluid pressure. The float preferably has a cylindrical-shaped through-bore. The float rod preferably has a polygonal-shaped perimeter over substantially its entire length permitting fluid flow between the float rod outer diameter (OD) and the float inner diameter (ID) to dislodge any particulate, thereby serving a self-cleaning function. The float rod is preferably hollow and closed at its upper end and having flow inlet and flow outlet openings near its lower end communicating with a flow chamber which conveniently provides the inlet and outlet flows at the lower end of the flow meter.

Abstract: A flow meter alarm device easily attached to and removed from a flow meter at various locations along the length of the flow meter. The device is compatible with flow meters which have a float for measuring flow velocity. The device preferably has two housings, extending from a third housing having a display surface, that define an area for receiving a flow meter. The extending housings are preferably drawn together by a threaded member thereby clamping the device onto the flow meter. A sensor mounted on the device, preferably an optical emitter coupled with an optical receiver, is able to detect the float. When the float is detected, a signal is produced by the device notifying that the flow rate has fallen outside a desired range. The device is adjustable to function with flow meters of various different dimensions.

Abstract: A device for converting a position of a float member in a rotameter in to an electrical output. Light from a light source is collimated into parallel light rays, at either or both opposing sides of a rotameter tube to greatly enhance accuracy of readings. The lightrays passing through the tube are detected by a linear optical array. A range of movement capable of being read by the linear optical array is extended by use of either a fiber optical array or a movable illumination device and linear optic array. The collimator(s) may be a linear array of one or two rows of cylindrical lenses sandwiched between a pair of plates. The linear optic array maybe arranged on opposite sides of the rotameter tube or may be on the same side there of. A light guide is used in the latter arrangement to guide light from the light source to a side of the rotameter tube opposite the linear optic array which may be a charge-coupled device(CCD).