Registers – Platform operated – Platform actuated traffic counters
Patent
1977-11-08
1979-06-19
Thesz, Joseph M.
Registers
Platform operated
Platform actuated traffic counters
235 92CA, 235 92FL, 235 92R, 340210, G01F 132, H03K 2500
Patent
active
041587650
ABSTRACT:
An electronic totalizer interposable in the line of a two-wire transmitter having a transducer which converts a metered variable into a current signal that is conveyed over the line to a receiving station, the same line delivering direct current power from the station to the transducer and to the totalizer. The totalizer input circuit includes a resistor through which the current signal flows to produce a corresponding voltage signal, the voltage signal being applied to a resettable integrator to produce a time-integrated voltage which rises above a base level at a rate depending on the varying magnitude of the voltage. The rising integrated voltage is applied to a comparator having a threshold set by a reference voltage to produce an output signal when the integrated voltage reaches the threshold. The output signal is fed back to the integrator to effect resetting thereof to the base level, the output signal also serving to trigger a one shot generating a pulse which is applied to a digital counter. The number of pulses indicated by the counter display represents the time-integrated total of the metered variable.
REFERENCES:
patent: 3409763 (1968-11-01), Schoppe et al.
patent: 4084155 (1978-04-01), Herzl et al.
Schmoock Roy
Shauger Herbert
Ebert Michael
Fischer & Porter Co.
Thesz Joseph M.
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