CONTROL ELECTRONICS, INC.

Used in industrial and municipal sewers and in sewage treatment plants. The throat sections create a constriction for the flow. This produces a head (depth of flow) that is related to the volume discharge. The approaching flow should be reasonably free of turbulence, eddies and waves for accurate measurements to occur. The advantages of the Parshall flume are its ability to self-clean and function over a wide operating flow range with little loss in accuracy. Parshall flume size is determined by the throat width. The flume is typically prefabricated fiberglass and comes in many sizes.

Palmer-Bowlus flumes were designed to be inserted into an existing round pipe or conduit with suitable slope, approximately 2%. The flume is primarily used in manholes with open round channels/pipes. Some advantages of the flume are easy installation, good accuracy and minimal flow restriction. Disadvantages are that the flow rate range is small and they have poor resolution (small change in flow depth to flow rate discharge). The Palmer-Bowlus flume size is determined by the size of the pipe or conduit in which they fit, not by the throat width. However, flume size should be selected to suit the flow rates expected (select a flume size equal to or less than the conduit size). When installing the Palmer-Bowlus flume it is important that the approaching slope (2% or less) should be straight (25 pipe diameters) and the discharge slope should be equal to or greater than the approaching slope. The flume itself should be level. The approaching flow should be reasonably free of turbulence, eddies and waves for accurate measurements to occur.

CONTROL ELECTRONICS, INC. P.O. Box 330, Brandamore, PA 19316

(610) 942-3190 FAX: (610) 942-3672