Abstract: A probe adapted to fit in an open end of a sewer or water conduit is provided with a weir plate and with a bubble tube for sensing the depth of flow over the weir plate and, thus, determining the flow rate. A V-notch weir plate is made up of two like pieces flexibly joined at their apex, thereby enabling the probe to be compressed for ease of insertion into the open end and to be expanded therewithin for frictional retention against the inside wall of the conduit, to which the probe conforms. Except for the weir plate itself all parts of the probe lie along the wall for minimum disturbance of the flow.

Abstract: Electrically actuated apparatus for sampling liquid from a body thereof provides visible countdown of the time interval between successive samplings and also provides visible countdown of the duration of the time in which individual samples are being taken. The samples are propelled by fluid from an external or internal source of pressure, whichever is greater, interconnected for each sample duration period to a sample intake chamber in the body of liquid being sampled.

Abstract: Liquid samples of like composition and like or unlike volume are collected simultaneously. Liquid is withdrawn continuously from a body of liquid to be sampled. The withdrawn liquid is passed continuously into and fills a confining region having multiple outlets. Streams of liquid from the respective outlets are diverted intermittently for sample collection and otherwise are returned to the source body of liquid or to waste. The multiple-outlet confining region is embodied in a plenum chamber, and individual diverter chambers are provided for the streams of liquid from the plenum chamber, together with means for effecting the diversion.

Abstract: Liquid samples are collected simultaneously by intermittent diversion of a stream withdrawn from a body of liquid to be sampled and passed by a diversion locus into a splitting region having multiple outlets. The liquid is prevented from flowing through the outlets during periods of diversion, and upon completion of such period the outlets are opened to pass liquid streams therefrom. This multipleoutlet confining region is embodied in the sample compartment of a diverter chamber, and the valving includes a horizontally movable slide adapted to close off and to open up all the outlets in unison.

Abstract: Successive samples are taken periodically from a body of liquid with the aid of pressurized fluid serving as both timing medium and sample propellant. Alternative high-pressure and low-pressure paths for the fluid correspond to high-lift and low-lift uses in sampling apparatus adjustable as to interval between successive samples and duration of taking of each sample, as well as convertible between levels of sample lift.

Abstract: Successive samples are taken periodically from a body of liquid with the aid of pressurized fluid serving as both timing medium and sample propellant. The sampling apparatus is adjustable as to interval between successive samples, duration of taking of each sample, and sample lift.