Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1975-02-18
1976-12-14
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
204195F, 204195G, 204195M, 324 30R, G01N 2746
Patent
active
039974200
ABSTRACT:
An apparatus for automatically performing blood chemistry analyses and in particular the determination of the pH, PCO.sub.2 and PO.sub.2 of blood. The apparatus employs a flow cell having pH, PCO.sub.2 and PO.sub.2 measuring electrodes mounted therein adjacent to a sample passage extending through the cell. Sample is collected in a conventional syringe. The needle of the syringe is removed and the syringe cylinder is attached to the flow cell adjacent to the inlet end of the sample passage. Means are provided for automatically driving the plunger of the syringe into the cylinder to convey the sample through the sample passage. A wash solution is then conveyed through the passage to discharge the sample therefrom and thereafter a calibration solution is conveyed through the passage which permits simultaneous calibration of the pH, PCO.sub.2 and PO.sub.2 electrodes. A unique construction of the flow cell and means for mounting the measuring electrode therein allows the use of a single reference electrode which is common to each of the measuring electrodes. Means are also disclosed for allowing flushing of a capillary passage in the flow cell which forms a liquid junction between the reference electrode and the sample in the sample passage.
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Beckman Instruments Inc.
Meads R. R.
Steinmeyer R. J.
Tung T.
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