![]() ![]() A high accuracy depend on an orifice plate in good shape, with a sharp edge to the upstream side. ![]() Their accuracy are poor at low flow rates. The Turn Down Ratio for orifice plates are less than 5:1. ![]() The orifice plates are simple, cheap and can be delivered for almost any application and in any material. The plate obstructing the flow offers a precisely measured obstruction that narrows the pipe and forces the flowing fluid to constrict. With an orifice plate, the fluid flow is measured through the difference in pressure from the upstream side to the downstream side of a partially obstructed pipe. Note that it is common to use " head" instead of "pressure"Ĭommon types of differential pressure flow meters are: Ρ = density of fluid (kg/m 3, slugs/ft 3) The differential pressure flow meter is based on the Bernoulli Equation where the pressure drop and the further measured signal is a function of the square flow speed. In a differential pressure drop device the flow is calculated by measuring the pressure drop over an obstructions inserted in the flow.
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