Automatic constant air flow rate pump unit for sampling air

Details Automatic constant air flow rate pump unit for sampling air Automatic constant air flow rate pump unit for sampling air

1990-02-05

1992-11-17

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 20, 417 22, 7386303, F04B 2500, F04B 4900

Patent

active

051638185

ABSTRACT:
An air sampling device comprises a pump assembly including a pump and a motor operably associated with the pump, the air flow rate of the assembly being substantially characterized by a function having a plurality of measurable variables; sensors for periodically automatically monitoring the variables; a programmable computer operably associated with the sensors for periodically estimating the instantaneous air flow rate of the pump from the function and the monitored variables and for camparing the calculated instantaneous air flow rate with a previously programmed desired air flow rate; and a DC-DC converter responsive to the computer and operably associated with the motor for modulating the motor speed in response to the computer to thereby cause the instantaneous air flow rate of the pump to approach the desired air flow rate.

REFERENCES:
patent: 4063824 (1977-12-01), Baker et al.
patent: 4123932 (1978-11-01), Baker et al.
patent: 4269059 (1981-05-01), Baker
patent: 4384825 (1983-05-01), Thomas et al.
patent: 4389903 (1983-06-01), Bertone et al.
patent: 4432248 (1984-02-01), Lalin
patent: 4527953 (1985-07-01), Baker et al.
patent: 4532814 (1985-08-01), Lalin
patent: 4576054 (1986-03-01), Lalin
Operating Manual for HFS513 Air Sampling System (Silian) pp. 3-29.
Instrument Corp-Air Sampling Equipment and Supplies-Price Guide and Catalogue pp. 3-18.

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