Method for diluting a liquid test sample and computer controlld

Details Method for diluting a liquid test sample and computer controlld Method for diluting a liquid test sample and computer controlld

1980-06-02

1982-08-31

Schmidt, Frederick R.

Fluent material handling, with receiver or receiver coacting mea

Processes

Battery grid pasting

7386412, 7386416, 141 27, B65B 332

Patent

active

043467423

ABSTRACT:
Improved method for the pick up and delivery of a liquid test sample and diluent therefore by a single syringe having a syringe valve for placing the syringe barrel in fluid connection with either a diluent pick up line or a sample pick-up line. The method is comprised essentially of the steps of priming the apparatus, picking up the diluent through the diluent pick-up line and thereafter with a continuing downward stroke of the syringe plunger picking up a percentage volume of liquid sample. Preferably, an air bubble is picked up in the end of the sample pick-up line before the sample pick-up cycle. After the full downward stroke of the syringe plunger, the diluted sample is delivered by depressing the plunger to its zero volume setting.
An apparatus is provided having a computer controlled syringe plunger drive which includes a zero volume switch, and a computer controlled syringe valve having branch ports adapted to be connected to a diluent and a sample pick-up line. The computer control sequences the plunger drive and the syringe valve to pick-up diluent and sample and deliver diluent and sample as above-described.

REFERENCES:
patent: 3197285 (1965-07-01), Rosen
patent: 3901084 (1975-08-01), Brailsford
patent: 3915651 (1975-10-01), Nishi

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