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Capacitative electromagnetic flow meter

The invention consists in a capacitative electromagnetic flow meter in which excitation is performed at a frequency above the commercially available frequency and having a characteristic correction filter that corrects the gain frequency characteristic of the exciting current such that the exciting flux waveform has a flat section. In the detection unit, the value of the electrostatic capacitance between the face electrodes 4A, 4B and guard electrodes 5A, 5B is made smaller than the value of the electrostatic capacitance between the detecting face electrodes 4A, 4B and the fluid to be measured. The exciting coils are fixed to a cylindrical yoke, being electrostatically screened by coil fixing plates. Fixing by an earth ring is performed with this cylindrical yoke and the two ends of the measurement tube being symmetrical with respect to the tube axis and electrode axes. In addition, fixing is effected by filling the entire interior of the detection unit with epoxy resin.

Flow meter

A flow meter comprises an inflow chamber having a first fluid inlet, an outflow chamber housed in the inflow chamber and having a second fluid inlet, which is in fluid communication with the inflow chamber, and a fluid outlet by which fluid can drain from the outflow chamber, and a sensing device having a elongate sensor which is positioned at, or adjacent to and downstream of, the second fluid inlet. The second fluid inlet is of limited dimensions so that, in use, a head of fluid is formed in the inflow chamber and the flow rate of the fluid passing through the second fluid inlet is monitored based on the extent of the elongate sensor which is covered by the fluid.

Positive flow meter

A flow meter and electrically operable valve assembly having integral flow meters provide detection of very low water flows, along with ease of installation and compact packaging for a water supply control system. The flow detection is particularly useful for systems that control household water supplies to prevent flooding, but is also useful in other applications such as agricultural and industrial systems where low water flow rates must be determined. All of the controls and features are integrable within a compact package that occupies essentially the same volume and piping space as a conventional electrically operable valve.

Ultrasonic flow meter

This ultrasonic flow meter is provided for measuring flow volume by determining the flow rate of a liquid from the difference in propagation times of ultrasonic waves in both directions between measuring units by providing measuring units having transducer at an interval in the lengthwise direction on a measuring pipe through which liquid flows. A pair of mounting members are provided in a lower case of a case serving as a base at an interval wider than that of measuring units. The measuring pipe is held by respective retaining indentations to the outside in the axial direction of measuring units by facing a left mounting member and a right mounting member that compose the mounting members. In addition, an insulating material is filled into the case so as to cover the measuring units and the measuring pipe.


Retrievable downhole flow meter
Capacitative electromagnetic flow meter
Ultrasonic flow meter with reduced noise
Coriolis mass flow meter having a thick-walled measuring tube
Detector for an ultrasonic flow meter
Karman vortex flow meter
Coriolis mass flow meter employing non-metallic flow conduit structure
Fluidic volumetric fluid flow meter
Electromagnetic flow meter
Fluid flow meter utilizing pressure sensing
Air flow meter
Fluid flow meter
Liquid flow meter construction
Positive displacement flow meter method and apparatus
Magnetic-inductive flow meter with a measuring tube made of plastic


PAT. NO. Title
51 6802223 Capacitative electromagnetic flow meter
52 6796188 Flow meter
53 6792799 Positive flow meter
54 6782761 Ultrasonic flow meter
55 6782325 Programmable coriolis flow meter electronics for outputting information over a single output port
56 6779516 Closed crankcase ventilation system with flow meter for monitoring engine operation
57 6772643 Flow meter
58 6755086 Flow meter for multi-phase mixtures
59 6752014 Hot-wire type air flow meter for internal combustion engine
60 6750773 Liquid flow meter
61 6729366 Flow meter type liquid filling apparatus
62 6722209 Coriolis force type flow meter using optical interferometer
63 6715367 Univer plus mass air flow meter
64 6705161 Positive displacement flow meter method and apparatus
65 6699198 Ocular-blood-flow meter
66 6698297 Venturi augmented flow meter
67 6694811 Flow meter having airflow sensor
68 6692535 Method and apparatus using turbine flow meter to measure fluid flow therethrough without reference to viscosity
69 6681645 Moving target flow meter
70 6675662 Flow meter
71 6672173 Flow meter
72 6670582 Micro-thermocouple for a mass flow meter
73 6668643 Optical flow-meter device
74 6644133 Flow meter module for a controller
75 6644130 Ultrasonic flow meter having a tubular elastic transducer holding unit
76 6640627 Fluid flow meter having a fluorine-containing sealant which maintains silicon-containing filler in installation recess
77 6637705 Flow meter strut
78 6634237 Collection reservoir for use with flow meter control system
79 6629564 Downhole flow meter
80 6626838 Blood flow meter apparatus and method of use
81 6626048 Magnetic flow meter
82 6622096 Method of setting flow coefficient and flow meter using the same
83 6612167 Air flow meter having turbulence reduction member
84 6611775 Electrode leakage diagnostics in a magnetic flow meter
85 6606572 Circuit arrangement for deriving the measured variable from the signals of sensors of a flow meter
86 6599277 Aspiration flow meter and control
87 6598488 Coriolis effect fluid flow meter
88 6591694 Flow meter with a self-illuminating floater
89 6564825 Mass flow meter systems and methods
90 6564824 Mass flow meter systems and methods
91 6564649 Ultrasonic doppler flow-meter
92 6561207 Mass flow meter systems and methods
93 6561043 Oil well flow meter with circumferentially extending pocket
94 6557531 Thermal type air flow meter
95 6544180 Blood flow meter apparatus and method of use
96 6539813 Throttle structure and flow meter incorporated with throttle structure
97 6516675 Bubble ultrasonic flow meter
98 6510842 Flow meter
99 6508135 Liquid flow meter
100 6502451 Leakage detector, a latching solenoid, a flow meter, and a liquid dispensing apparatus including same

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