Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-03-27
1984-10-09
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340619, 340516, G08B 2900
Patent
active
044764600
ABSTRACT:
An apparatus is provided for monitoring and indicating the amount of material in a hopper or a bin includes self-test circuitry for automatically testing both a material level sensor and circuitry for storing the output signal generated by the sensor. During the normal operation of the monitoring apparatus, the value of the sensor output signal is compared with the values of predetermined maximum and minimum reference signals. If the sensor output signal is greater than the predetermined maximum value or less than the predetermined minimum value, the test circuit generates a failure indication to the operator of the apparatus. In order to test the sensor output signal storage circuitry, the test circuit disables the sensor and generates a simulated sensor output signal to the storage circuitry. The test circuit then compares the stored signal with the simulated signal and generates a failure indication if they are different.
REFERENCES:
patent: 2882520 (1959-04-01), Haas
patent: 3322959 (1967-05-01), Lorenz
patent: 3908133 (1975-09-01), Hartley
patent: 3908441 (1975-09-01), Virgolet
patent: 4058765 (1977-11-01), Richardson et al.
patent: 4103292 (1978-07-01), Haas
Brigance Gerald L.
Ramsey Engineering Company
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