Method and apparatus for weighing material being collected

Details Method and apparatus for weighing material being collected Method and apparatus for weighing material being collected

1980-03-06

1981-10-13

Hartary, Joseph W.

Weighing scales

Processes

177165, 177DIG3, 235 92WT, G01G 1300, G01G 2314

Patent

active

042943205

ABSTRACT:
Process and apparatus for weighing material being collected. In the illustrative embodiment, plasma that has been separated from whole blood is collected. The tare weight is sensed and the weight of the material being collected is sensed. Pulses are provided in frequency proportion to the sensed weight. The tare weight pulses are counted and stored. A net weight counter is set with a predetermined count corresponding to the maximum amount of plasma to be collected. A measure weight signal reverses the tare weight count with the net weight counter being inhibited until the tare weight count reversal has been completed. Once the tare weight count reversal is completed, the net weight counter is operative to count the sensed weight pulses. A completion signal is provided when the predetermined count has been decremented to zero.

REFERENCES:
patent: 3684875 (1972-08-01), Smith
patent: 3853267 (1974-12-01), Cadwell
patent: 3924700 (1975-12-01), Lindsay
patent: 4044846 (1977-08-01), Matilainen

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