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    PHOTOIONIZATION DETECTOR AUTOMATED ZERO LEVEL CALIBRATION
    3.
    发明公开
    PHOTOIONIZATION DETECTOR AUTOMATED ZERO LEVEL CALIBRATION 审中-公开

    公开(公告)号：EP4435429A3

    公开(公告)日：2024-12-18

    申请号：EP24184897.7

    申请日：2016-07-29

    Applicant: Honeywell International Inc.

    Inventor： XIE, Guangli ,  CHEN, Bo ,  WU, Zhanghua ,  GONG, Yaofu

    IPC: G01N30/64 ,  G01N27/66 ,  G01N33/00 ,  G01N30/86

    Abstract: A method of detecting gas with a photoionization detector, PID, system (1, 100), comprising: determining and storing, by a controller (2, 102), a zero level of a photoionization detector (4, 104, 106, 108, 112, 116), using ambient air flowed from surrounding environment past a detector electrode (108) of the photoionization detector (4, 104, 106, 108, 112, 116), wherein the stored zero level is based on an ambient temperature; sensing the ambient temperature; adapting the stored zero level algorithmically based on a change sensed in the ambient temperature; sampling, by the controller (2, 102), an output of the detector electrode (108) of the photoionization detector (4, 104, 106, 108, 112, 116) when an ultraviolet lamp (106) is in a turned ON state; and comparing the sampled output of the detector electrode (108) to the stored zero level to determine if a threshold concentration of a gas is present.

    METHOD FOR CONTROLLING LIQUID CHROMATOGRAPH
    9.
    发明公开
    METHOD FOR CONTROLLING LIQUID CHROMATOGRAPH 审中-公开

    公开(公告)号：EP4446732A1

    公开(公告)日：2024-10-16

    申请号：EP22903964.9

    申请日：2022-11-10

    Applicant: HITACHI HIGH-TECH CORPORATION

    Inventor： NOGAMI Makoto ,  HARADA Yushi

    IPC: G01N30/02 ,  G01N30/26 ,  G01N30/32 ,  G01N30/86

    Abstract: Provided is a method for controlling a liquid chromatograph capable of determining whether a bubble remains in a flow path. The method for controlling a liquid chromatograph (300) according to the invention is a method for controlling the liquid chromatograph (300) including a liquid delivery pump, a flow path connected to the liquid delivery pump, a flow path switching valve (an auto purge valve (205), an injection valve (207), and a stream select valve (304)) provided in the flow path and configured to switch a plurality of connection destinations for the flow path, and a pressure sensor configured to detect at least one of a liquid delivery pressure of the liquid delivery pump, a flow path pressure in the flow path, and a pressure applied to the flow path switching valve. The method includes rotating the flow path switching valve during liquid delivery from the liquid delivery pump, and determining whether a bubble remains in the flow path based on a pressure fluctuation when the pressure lowered by rotating the flow path switching valve increases.

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