Method for diluting a liquid test sample and computer controlld diluting apparatus
US4346742A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1980 |
| Grant date | Aug 31, 1982 |
| Priority date | — |
| Expiry date | Jun 2, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N1/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.