|5537860||Fluid sensor including substantially linear flow resistor|
The volumetric flow rate of a fluid is determined essentially independently of the properties of the fluid by guiding the volumetric fluid flow to be measured through an essentially linear flow resistor. An alternating flow of the fluid is superimposed on...
|4123941||Ram pump flowmeter|
A mass-rate flowmeter of the recirculation type wherein the recirculating flow is created by a ram type centrifugal pump having a substantially constant volume flow discharge rate over the operating pressure range of said mass-rate flowmeter....
A pressure-difference type mass flowmeter with constant volumetric recirculation effected by a pump, with an annular flow path having four junctions each having a spur path. One pair of the alternate spur paths serve as inlet and outlet of the fluid flow ...