Sensor controlled sampling apparatus and method

Fluent material handling – with receiver or receiver coacting mea – Processes – Battery grid pasting

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141 91, 141 94, 251 4, 417474, 422100, B65B 304

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046606076

ABSTRACT:
A flexible tube of uniform internal diameter extends through a peristaltic pump and has its inlet communicating with a supply of liquid to be sampled. The pump is cyclically operated first in a reverse direction to purge all liquid from the tube, and then in a forward direction to pump liquid from the supply to a collector. When the pumped liquid fills a first portion of the tube for a predetermined axial distance from its inlet, a device disposed externally of the tube senses the presence of the liquid and signals a processor, which then determines the rate of flow of the liquid, and the total time T.sub.t the pump must operate to fill the entire tube plus a desired sample volume. The cycle is completed by momentarily reversing the pump to purge the first portion of the tube, and then it is operated in its forward direction for the time T.sub.t.

REFERENCES:
patent: 4039286 (1977-08-01), Keller et al.

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