Fume hood controller

Details Fume hood controller Fume hood controller

1991-07-10

1993-06-01

Joyce, Harold

Ventilation

Workstation ventilator

Covered workbench chamber

B08B 1502

Patent

active

052154971

ABSTRACT:
A fume hood controller utilizing feed forward and closed loop control to maintain a constant average face velocity of air entering the fume hood. A sash position sensor provides the controller with a signal indicative of the area of the fume hood opening. An air flow sensor provides the controller with a signal indicative of flow rate. Fast response to a change in sash position is provided by feed forward control which adjusts an air valve or fan to provide a constant face velocity. After initial adjustment by the feed forward control, closed loop control is operable to fine tune the air valve or fan to provide highly accurate control of face velocity. Emergency control is also provided to drive the air flow to a maximum rate when an emergency exhaust button located on the fume hood is pressed.

REFERENCES:
patent: 3996796 (1976-12-01), Adler et al.
patent: 4466341 (1984-08-01), Grogan
patent: 4497242 (1985-02-01), Moyer
patent: 4528898 (1985-07-01), Sharp
patent: 4706553 (1987-11-01), Sharp et al.
patent: 4934256 (1990-06-01), Moss et al.
patent: 4982605 (1991-01-01), Oram et al.
patent: 5092227 (1992-03-01), Ahmed et al.
Krueger, Division of Philips Industries 36 page brochure entitled "System 3-Custom DDC VAV Laboratory Ventilation Equipment".
Landis & Gyr brochures regarding "Powers VAV Fume Hood Control System".
Cambridge Filter Corporation 2 page brochure entitled "AccuSensor Air Sentinel Air Flow Measuring Probe".

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