Printed wiring board means with integral dew sensor

Details Printed wiring board means with integral dew sensor Printed wiring board means with integral dew sensor

1985-09-12

1986-07-01

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

200 6104, 307118, H01G 520, H01H 2900, H01H 3518

Patent

active

045983330

ABSTRACT:
An electronic control device utilizes a plurality of conductive areas on an associated printed wiring board to create integral dew sensors. The dew sensors are created by providing parallel conductive surfaces that are connected in turn by a resistor to a high impedance switch in the form of the gate of a field effect transistor. In the event that moisture vapor or dew is present in the control device, a conductive path is created that causes the control device to shut down in a safe or alternate mode from the normal mode of operation.

REFERENCES:
patent: 3333258 (1967-07-01), Walker et al.
patent: 3525902 (1970-08-01), Davidson et al.
patent: 3624541 (1971-11-01), Lundstrom
patent: 3794847 (1974-02-01), Cadiou
patent: 3898423 (1975-08-01), Taylor et al.
patent: 3949389 (1976-04-01), Monk et al.
patent: 4322777 (1982-03-01), Ueta et al.
patent: 4369479 (1983-01-01), Rickard
Honeywell Installation and Instruction Sheet-Form Number 68-0044-2, Revised Sep. 1984, entitled Hot Surface Ignition Control.

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