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    A PROCESS WATER ANALYZER
    4.
    发明公开
    A PROCESS WATER ANALYZER 审中-公开

    公开(公告)号：EP4310461A1

    公开(公告)日：2024-01-24

    申请号：EP22185437.5

    申请日：2022-07-18

    申请人： Hach Lange GmbH

    发明人： GOLITZ, Andreas ,  BATTEFELD, Manfred ,  DE HEIJ, Dr. Bas ,  HEUWOLD, Maik ,  MINKE, Sebastian

    IPC分类号： G01F11/02 ,  F04B49/00 ,  G01N21/17 ,  G01N33/18 ,  G01F22/02

    摘要： The invention is directed to a process water analyzer (10) for automatically analyzing a parameter of a water sample, comprising
    a process liquid reservoir tank (70,72) with a process liquid (70',72'), whereas the process liquid reservoir volume (V70,V72) in the reservoir tank (70,72) defines a reservoir liquid level (170,172) at a reservoir liquid level height (h70, h72),
    a dosage chamber (30) fluidically connected to the process liquid reservoir tank (70,72) and being positioned fluidically downstream of the process liquid reservoir tank (70,72),
    a positive displacement dosage pump (20) fluidically connected to the top of the dosage chamber (30) for sucking the process liquid (70', 72') into the dosage chamber (30),
    whereas an air cushion (27) is always provided vertically between the dosage pump (20) and a liquid column upper level (I) of a process liquid column (lc70,lc72) with an effective vertical liquid column length (c70,c72) between the reservoir liquid level (170,172) and the liquid column upper level (I),
    a gas pressure sensor (60) sensing the gas pressure (P) of the air cushion (27), and
    a liquid reservoir volume control unit (100) calculating the actual process liquid reservoir volume (V70,V72) on the basis of the gas pressure (P) provided by the gas pressure sensor (60) and the known vertical height (h) of the liquid column upper level (I).
    This arrangement makes a liquid level sensor for the process liquid reservoir tank(s) redundant.