Abstract: The instrument disclosed herein is designed for measuring flow rates and densities of moving fluid streams, including liquids, gases, slurries, and fluids which contain solid materials. In one embodiment of this instrument, a conduit section, which has a 90 degree bend therein, is placed in a transfer line which carries the fluid stream to its use point. Defined within the conduit section is a chamber, which is located at the bend in the conduit. Installed within the chamber is a force measuring transducer and a piston, which is in contact with the diaphragm assembly of the transducer. In operation, part of the moving fluid is diverted into the chamber, to equalize fluid pressure across the diaphragm assembly of the transducer and the piston. This removes the effect of fluid pressure on the flow rate and density measurement, and allows the moving fluid to displace the piston by the force exerted by the fluid.

Abstract: The instrument disclosed herein is designed for measuring flow rates and densities of moving fluid streams, including liquids, gases, slurries, and fluids which contain solid materials. Basic components of this instrument are a dynamic leg and a static leg, and flexible connections in each leg which allow for displacement caused by the force of the moving fluid. Each leg is defined by a conduit member having several bends therein, which are joined by straight sections. The legs are held in physical contact along one of the straight sections, and a displacement transducer unit is installed at this point. In operation, part of the incoming fluid to be measured for flow rate fills the static leg and remains in this leg. After the static leg is full, all of the incoming fluid moves through the dynamic leg, and fluid pressure is in equilibrium within the system.