Fan speed and/or fan failure detector

Details Fan speed and/or fan failure detector Fan speed and/or fan failure detector

1982-12-20

1984-10-23

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340626, 340635, 340530, 367135, 381 56, 381 58, 415118, 417 63, G08B 2100

Patent

active

044791151

ABSTRACT:
A pressure transducer, such as a microphone, is placed in proximity to the blades of a fan, such as a fan used to cool electronic equipment. As each blade passes the transducer, a pressure wave is generated that is converted into an electrical pulse by the transducer. Circuitry responsive to those pulses signals an alarm if the fan is not operating properly.

REFERENCES:
patent: 2969530 (1961-01-01), Duncan
patent: 4000450 (1976-12-01), Nurnberg
patent: 4345247 (1982-08-01), Thornton et al.

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