Air flow sensor

Details Air flow sensor Air flow sensor

1978-12-29

1980-09-02

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340608, 340654, 340664, 340679, G08B 1900

Patent

active

042209501

ABSTRACT:
An air flow sensor has a hollow tubular housing partially filled with potting compound and having a printed circuit board mounted in the compound inside the tube. The board is mounted such that two power resistors and a first heat sensing switch mounted on the board are embedded in the potting compound, and a second heat sensing switch mounted on the board above the compound is in contact with the ambient atmosphere. The power resistors are connected in parallel to a power source driving a fan, and the first switch has an actuation temperature selected to activate the switch when the power resistors radiate a selected amount of heat. The second switch also has an actuation temperature due to lack of air flow chosen to activate the switch when the ambient atmosphere reaches the designated temperature.

REFERENCES:
patent: 2663859 (1953-12-01), MacInnes et al.
patent: 2736884 (1956-02-01), Yeomans
patent: 3196679 (1965-07-01), Howland

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