Dry flow sensor with automatic speed compensation and totalizer

Details Dry flow sensor with automatic speed compensation and totalizer Dry flow sensor with automatic speed compensation and totalizer

1985-05-16

1988-01-19

Rowland, James L.

Measuring and testing

Volume or rate of flow

With indirect temperature or density compensation

7386173, G01F 186, G01F 130

Patent

active

047198052

ABSTRACT:
An ultrasonic speed sensor produces a linear voltage directly proportional to the speed of material falling through a chute and contacting a plate. A transducer coupled to the plate produces a second linear voltage which is directly proportional to the force applied to the plate by the material as it impacts the plate. An electronic dual slope integrator circuit combines these two linear DC voltages to produce a digital pulse output whose frequency is directly proportional to the flow rate of the material. The digital pulse output may be used to drive a totalizer which totals the amount of material flowing through the chute, and an indication meter to provide an instantaneous readout of the flow rate.

REFERENCES:
patent: 3595078 (1971-07-01), Beck et al.
patent: 3635082 (1972-01-01), Prellwitz et al.
patent: 3802261 (1974-04-01), Zimmerman et al.
patent: 3822377 (1974-07-01), Beck
patent: 4183245 (1980-01-01), Connery et al.
patent: 4261196 (1981-04-01), Scheid, Jr.
patent: 4402230 (1983-09-01), Raptis
patent: 4413531 (1983-11-01), Karplus et al.
patent: 4540946 (1985-09-01), Sainz et al.
patent: 4543835 (1985-10-01), Volk, Jr. et al.
"Ultrasonic Properties of Coal Slurries and Flow Measurements by Cross Correlation", IEEE Transastions on Sonics and Ultrasonics, vol. 50-28, No. 4, (Jul. 1981).

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