Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1986-09-30
1988-10-25
Pellinen, A. D.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
366 8, 366160, 164 41, 164456, 364550, G01R 2702
Patent
active
047806656
ABSTRACT:
An apparatus for controlling the moisture content of sand as it is transported from storage to a mold making apparatus. A conveyor is used to transport a substantially uniform layer of sand at a known rate. The electrical resistance across the sand layer is measured using a series of electrically conductive members that extend into the sand. A thermocouple or other contact device is used to obtain an average temperature of the sand layer. The electrical resistance and average temperature measurements are used in a signal processor to calculate a starting moisture content for the sand. The signal processing unit also calculates an amount of water that should be added to the sand to achieve a computed moisture content value. The signal processing unit further controls the means for adding the water to the sand so that the computed moisture content value is obtained.
REFERENCES:
patent: 3376877 (1968-04-01), Fegan, Jr.
patent: 3497803 (1970-02-01), Fegan, Jr.
patent: 3500187 (1970-03-01), Fegan, Jr.
patent: 4251759 (1981-02-01), Boldt
patent: 4304289 (1981-12-01), McMullen
patent: 4616425 (1986-10-01), Burns
Deere & Company
Pellinen A. D.
Williams H. L.
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