4.
    发明专利
    未知

    公开(公告)号:DK155765C

    公开(公告)日:1989-10-23

    申请号:DK263576

    申请日:1976-06-11

    Abstract: Apparatus for measuring carbon dioxide and chloride in blood. A blood sample is reacted with acid in a sample container to release carbon dioxide, a portion of which diffuses through a gas-permeable membrane and reacts with an electrolyte to change the pH thereof. A pair of pH measuring electrodes monitor the electrolyte pH at respective locations adjacent to and remote from the region of reaction within the electrolyte. The pH electrodes are coupled to respective input terminals of a differential amplifier to derive a differential pH signal. The differential pH signal is differentiated to derive a rate of change of pH output signal which is measured to indicate the concentration of carbon dioxide. The pH measuring electrodes are in electrolytic communication and means is provided to renew the electrolyte between measurements. Coulometric measurement of chloride in the sample is performed simultaneously with the carbon dioxide measurement.

    Liquid analysis apparatus
    6.
    发明授权
    Liquid analysis apparatus 失效
    液体分析仪

    公开(公告)号:US3701716A

    公开(公告)日:1972-10-31

    申请号:US3701716D

    申请日:1969-04-15

    CPC classification number: G01N35/00 G01N2035/00534 G01N2035/1025

    Abstract: AN APPARATUS FOR BATCH ANALYSIS OF LIQUID SAMPLES WHEREIN SYRINGES ARE EMPLOED FOR DELIVERING REPEATABLE VOLUMES OF REAGENT TO A CELL PRIOR TO THE ADDITION OF A SAMPLE AND FOR WITHDRAWING LIQUID FROM THE CELLA AFTER ANALYSIS THEREOF. SENSING MEANS, SUCH AS A POLAROGRAPHIC OXYGEN SENSOR, IS MOUNTED IN THE SIDE WALL OF THE CELL WITH ITS SENSING CONTACTING THE LIQUID THEREIN. A STIRRING ELEMENT IS POSITIONED WITHIN THE CELL AND ROTATED ABOUT THE VERTICAL AXIS OF THE CELL SO THAT A HIGH TANGENTIAL STIRRING FORCE IS PRODUCED TO PROMOTE MIXING OF SAMPLE WITH REAGENT AND TO OPTIMIZE SENSOR PERFORMANCE, YET ONLY SMALL SAMPLE VOLUMES ARE REQUIRED. THE APPARATUS IS PARTICULARLY SUITED FOR RATE SENSING BATCH ANALYSIS OF BIOLOGICAL FLUIDS SUCH AS BLOOD OR URINE.

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