Peristaltic pump controller with scale factor that varies as a s

Details Peristaltic pump controller with scale factor that varies as a s Peristaltic pump controller with scale factor that varies as a s

1997-10-30

1999-09-07

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

F04B 4908

Patent

active

059476923

ABSTRACT:
A controller for a peristaltic pump receives as an input pressure P.sub.i sensed at the inlet of the pump. The controller derives a nonlinear scale factor S.sub.Pi that varies as a step function with P.sub.i. The scale factor S.sub.Pi equals a first nonvariable value when P.sub.i lays in a first defined zone of inlet pressures, and equals a second nonvariable value, different than the first nonvariable value, when P.sub.i lays in a second defined zone of inlet pressures different than the first defined zone of inlet pressures. The controller generates a pump speed command based, at least in part, upon S.sub.Pi.

REFERENCES:
patent: 4392849 (1983-07-01), Petre et al.
patent: 4468219 (1984-08-01), George et al.
patent: 4820281 (1989-04-01), Lawler

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