Fume hood energy controller

Details Fume hood energy controller Fume hood energy controller

1982-12-17

1984-08-21

Makay, Albert J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340611, F23J 1100

Patent

active

044663412

ABSTRACT:
A control system for a fume hood, wherein limit switches sense the position of the sash, and pressure and light sensors monitor pressure changes in the fume hood and ambient light. A low volume fan continously draws air through the fume hood. When the sash is opened the high volume fan is actuated. Air flow is monitored as the sash position is changed; and an alarm system is actuated when an unsafe condition exists.

REFERENCES:
patent: 3874754 (1975-04-01), Saunders et al.
patent: 4121199 (1978-10-01), Young
patent: 4160407 (1979-07-01), Duyn
D. Rude, "Exhaust Alarm", IBM Technical Disclosure Bulletin, IBM Corporation, vol. 25, No. 6, Nov. 1982.

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