Personal sampling pump

Details Personal sampling pump Personal sampling pump

1980-10-31

1983-05-24

Look, Edward K.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

318313, 417 42, 417 45, 417 63, F04B 4906

Patent

active

043848257

ABSTRACT:
A portable battery powered pump providing constant mass flow of air sample through a particular filter or vapor trap in which the pump drive motor speed is controlled by an amplifier having a reference voltage input and an inverse feedback signal related to sensed motor speed. Compensation for increased resistance to air sample flow is made by a motor current feedback signal applied to the amplifier to cause motor speed to increase with increased flow resistance.

REFERENCES:
patent: 978167 (1910-12-01), Kelsey
patent: 2877715 (1959-03-01), Rittenhouse
patent: 3015281 (1962-01-01), Umholz
patent: 3295359 (1967-01-01), Peck
patent: 3410059 (1968-11-01), Garnier
patent: 4024864 (1977-05-01), Davies et al.
patent: 4063824 (1977-12-01), Baker et al.
patent: 4123932 (1978-11-01), Baker et al.
patent: 4145161 (1979-03-01), Skinner
patent: 4221543 (1980-09-01), Cosentino et al.
patent: 4257746 (1981-03-01), Wells

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