Flow-controlled sampling pump apparatus

Details Flow-controlled sampling pump apparatus Flow-controlled sampling pump apparatus

1992-12-21

1994-03-22

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Responsive to change in rate of pump fluid flow

417 45, 417 63, 417234, 7386152, F04B 4906, F04B 4908

Patent

active

052957900

ABSTRACT:
A portable sampling pump apparatus including a flow control mechanism having a laminar flow meter for providing a precise readout of the volumetric flow rate of the pump as well as feedback control for the pump motor. The pump apparatus includes an electric motor, a pump operably driven by the electric motor, a laminar flow element positioned in a flow path of the pump, a pressure transducer for sensing a pressure drop across the laminar flow element and for producing an electrical signal that is directly and linearly proportional to the volumetric flow rate through the pump, and a motor control circuit which uses the electrical signal to control the voltage applied to the motor and to thereby regulate the flow of the pump. This electrical signal is also used to generate a display for the user of the volumetric flow of the pump.

REFERENCES:
patent: 3504542 (1970-04-01), Blevins
patent: 3626755 (1971-12-01), Rudolph
patent: 4063824 (1977-12-01), Baker et al.
patent: 4389903 (1983-06-01), Bertone et al.
patent: 4527953 (1985-07-01), Baker
MSA Instruction Manual for Flow-Lite.TM. Sampling Pumps 479876 TAL(L) Rev 5, 1987.

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