Diaphragm-type sensor and analysis device using same
A sensor and diaphragm-type technology, which is applied in the direction of measuring devices, analyzing materials, and material analysis through electromagnetic means, can solve the problems of lower supporting diaphragm pressure, diaphragm deformation, and decreased measurement accuracy.
Pending Publication Date: 2022-06-03
HORIBA ADVANCED TECHNO
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[0006] However, in the diaphragm sensor of the internal liquid replenishment type as described above, although the deterioration of the internal liquid can be suppressed by replenishing the internal liquid into the diaphragm sensor, the internal liquid storage space is connected to a container set at atmospheric pressure, so The pressure of the internal liquid supporting the diaphragm becomes lower than that of a diaphragm sensor of the internal liquid non-replenishment type
Therefore, there is a problem that if the diaphragm is immersed in the sample solution at the time of measurement, the diaphragm is deformed by the pressure of the sample solution, and the measurement accuracy decreases.
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[0043] Hereinafter, an analysis device 400 using the diaphragm sensor 100 according to an embodiment of the present invention will be described with reference to the drawings.
[0044] The analyzer 400 of the present embodiment measures, for example, the concentration of a specific substance such as dissolved oxygen in a sample solution such as a chemical solution. Specifically, as figure 1 As shown, the analyzer 400 includes: a diaphragm sensor 100 of an internal liquid replenishment type, which is immersed in a sample solution and configured to be able to replenish the internal liquid from the outside; ; and the control device 300 .
[0045] The diaphragm sensor 100 includes a diaphragm 1 such as a gas permeable membrane that allows a specific substance in the sample solution to permeate, and detects the permeated specific substance based on the current flowing through the electrode structure 4 immersed in the internal liquid L. Specifically, as figure 2 As shown, the di...
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A diaphragm-type sensor having a diaphragm through which a specific substance in a sample solution passes, the diaphragm-type sensor detecting the specific substance passing through the diaphragm on the basis of a current flowing between a working electrode and a counter electrode immersed in an internal liquid, the diaphragm sensor is an internal liquid replenishment type diaphragm sensor capable of replenishment of the internal liquid from the outside, and is provided with: an accommodation body for accommodating the internal liquid and an electrode structure, the working electrode being exposed from the tip surface of the electrode structure; and a cover member which is attached to the tip end of the housing body, and which fixes the diaphragm by sandwiching the diaphragm between the cover member and the housing body so as to face the tip end surface of the electrode structure, the cover member having a facing surface facing the tip end surface of the electrode structure. The diaphragm is fixed in a liquid-tight manner by being sandwiched between the tip surface of the electrode structure and the facing surface of the lid member by a sealing member.
Description
technical field [0001] The present invention relates to a diaphragm-type sensor for detecting a specific substance contained in a sample solution, and an analysis device using the same. Background technique [0002] As a diaphragm type sensor, it is known to have a container that accommodates an internal liquid, a working electrode, and a counter electrode, and a diaphragm that is liquid-tightly fixed to the container and allows a specific substance to permeate into the container. This diaphragm sensor is used by immersing a diaphragm in a sample solution, and a specific substance such as dissolved oxygen passing through the diaphragm undergoes a reduction reaction on the surface of the working electrode. [0003] In recent years, as such a diaphragm type sensor, for example, an internal liquid replenishment type is known, which can replenish internal liquid from a container provided outside to an internal liquid storage space formed inside (for example, Patent Document 1). ...
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IPC IPC(8): G01N27/07
CPCG01N27/07G01N27/404G01N27/416G01N27/327G01N27/40
Inventor 藏本久典内藤久实
Owner HORIBA ADVANCED TECHNO