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19 条记录 (耗时 0.013 秒)

    Titration method and apparatus
    14.
    发明授权
    Titration method and apparatus 失效
    调查方法和装置

    公开(公告)号：US3692483A

    公开(公告)日：1972-09-19

    申请号：US3692483D

    申请日：1971-02-22

    申请人： BECKMAN INSTRUMENTS INC

    发明人： STERNBERG JAMES C

    IPC分类号： G01N31/16

    CPC分类号： G01N31/162 ,  Y10T436/116664

    摘要： A METHOD AND APPARATUS FOR PERFORMING TITRATIONS IN WHICH A SUBSTANTIALLY CONSTANT HYDROSTATIC HEAD OF TITRANT IS MAINTAINED IN A TITRANT RESERVOIR. AN ELONGATED CAPILLARY TUBE IS CONNECTED AT ONE END TO THE RESEVOIR AND THE OTHER END OF THE TUBE, CONSTITUTING THE TITRANT DELIVERY TIP, IS NORMALLY POSITIONED AT LEAST AS HIGH AS THE LEVEL OF TITRANT IN THE RESEVOIR SO THAT NO TIRANT FLOWS THROUGH THE TUBE. A SAMPLE IS DELIVERED TO A CELL BELOW THE TITRANT DELIVERY TIP. THE TITRANT DELIVERY TIP IS LOWERED TO ADJACENT THE CELL WHEREBY TITRANT WILL FLOW BY GRAVITY INTO THE CELL THE COMMENCE A TITRATION REACTION. MEANS ARE PROVIDED FOR DETECTING THE END POINT OF THE TITRATION REACTION IN THE CELL. THE TIME ELAPSED BETWEEN THE INTRODUCITON OF TITRANT INTO THE CELL AND THE TIME SUCH END POINT IS REACHED IS MEASURED. AFTER THE END POINT HAS BEEN DETECTED, THE TITRANT DELIVERY TIP IS RAISED TO THE LEVEL OF TITRANT IN THE TITRANT RESERVOIR TO CEASE FURTHER FLOW OF TITRANT INTO THE SAMPLE CELL. SINCE A CONSTANT HYDROSTATIC HEAD OF TITRANT IS PROVIDED, THE TITRANT WILL FLOW AT A CONTANT KNOWN RATE INTO THE CELL. BY KNOWING THE RATE OF FLOW OF TITRANT AND THE TIME THAT TITRANT FLOWS INTO THE SAMPLE CELL, THE TITER OF THE SAMPLE MAY BE DETERMINED.

    Temperature-controlled discrete sample analyzer
    15.
    发明授权
    Temperature-controlled discrete sample analyzer 失效
    温度控制分离样品分析仪

    公开(公告)号：US3616264A

    公开(公告)日：1971-10-26

    申请号：US3616264D

    申请日：1969-06-30

    申请人： BECKMAN INSTRUMENTS INC

    发明人： RAY ROBERT A ,  STERNBERG JAMES C

    IPC分类号： B01L7/00 ,  G01N21/25 ,  C12K1/10

    CPC分类号： G01N21/251 ,  B01L7/00 ,  Y10S435/808

    摘要： There is disclosed an apparatus for controlling the temperature of discrete sample containers in analytical instrumentation. A conveyor containing discrete samples to be analyzed is located in a subcompartment within a larger enclosure. A fan is mounted in a first opening in the subcompartment to move air from the large enclosure into the subcompartment. A second opening in which a thermal energy transfer element is mounted allows the passage of the air over the thermal energy transfer element back into the larger enclosure. A temperature sensor contacts a sample container being measured to provide a control signal which is applied to a proportionally controlled power supply connected to the thermal energy transfer element.