Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-10-26
1987-06-16
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6105, 340620, G08B 2100
Patent
active
046739254
ABSTRACT:
A boiling sensor includes a case, which is mounted on the upper edge of a container in which liquid is to boil. A pair of electrical probes are spaced apart a small distance and mounted on the case above the liquid. Behind the probes is a collector of the material, preferably sheet nylon, which does not absorb the liquid, which is non-wettable and electrical insulative, and which has a high heat capacity. With a high heat capacity, the vapor raises the temperature of the collector slowly so that vapor continues to condense on the collector between the probes. The probes are part of an electrical circuit. The condensed water vapor allows current to flow the between the probes, and the rest of the circuit causes current to flow through a sound or visual indicator to indicate that the water is boiling. This circuit also has a voltage divider, one side of which is the electrical probe, and by adjusting the resistance on the other side of the voltage divider, the sensitivity of the circuit can be controlled. In another embodiment the probes are a metal plate and a screw which extends into the case but which is electrically insulated by a nylon bushing. The bushing acts as the vapor collector.
REFERENCES:
patent: 957663 (1910-05-01), Emslie
patent: 2049321 (1936-07-01), Sampson
patent: 3123812 (1964-03-01), Woodling
Practical Electronics, vol. 15, No. 1, Jan. 1979, p. 31, Wilds, R. et al., "Kettle Whistle".
Practical Electronics, vol. 18, No. 3, Mar. 1982, p. 33, "Liquid Alarm".
Electronics, vol. 41, No. 6, Sep. 1979, pp. 96-101, Cohn, G., "Versatile Moisture & Light Detector.
Hofsass Jeffery A.
Rowland James L.
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