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A potentiometric sensor assembly and a method for monitoring the sensor function of a potentiometric sensor

A potential sensor and sensor technology, applied in the direction of measuring resistance/reactance/impedance, instruments, measuring devices, etc., can solve the problem of adding complexity to electrode components

Active Publication Date: 2020-01-17
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the addition of a solution ground electrode adds complexity to the electrode assembly

Method used

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  • A potentiometric sensor assembly and a method for monitoring the sensor function of a potentiometric sensor
  • A potentiometric sensor assembly and a method for monitoring the sensor function of a potentiometric sensor

Examples

Experimental program
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Embodiment Construction

[0064] figure 1 A potentiometric sensor assembly 1 is shown. It has an ion-sensitive electrode 2 (here a pH electrode 2 ) comprising an ion-sensitive (here pH-sensitive) glass bulb 3 . It also has a reference electrode assembly 4 which includes a reference electrode 5 . The ion-sensitive electrode 2 and the reference electrode 5 are electrically connected to an ion-sensing circuit 6 . The ion sensing circuit 6 has a first terminal 7 connected to the ion sensitive electrode 2 and a second terminal 8 connected to the reference electrode 5 .

[0065] When immersed in the aqueous solution 23 to be analyzed (in figure 1 In the exemplary scheme, when this aqueous solution 22 is accommodated in the container 24), as figure 2 As shown in the electrical equivalent circuit shown in , a potential difference V1 will be developed between terminal 7 and terminal 8. V 玻璃 is the potential difference developed across the ion-sensitive glass bulb 3 and is a measure for the concentration ...

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PUM

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Abstract

A potentiometric sensor assembly (1) und usage of said sensor assembly comprising- an ion-sensitive electrode (2) including an ion-sensitive glass bulb (3),- a reference electrode assembly (4) including a reference electrode (5),- an ion-sensing circuit (6) having a first terminal (7) connected to the ion-sensitive electrode (2) and a second terminal (8) connected to the reference electrode (5), said circuit (6) being designed to measure the potential difference (V1) that develops in the loop between the reference and the ion-sensitive electrode (5, 2),- a digital storage unit (9) which is designed to save at least an expected range of the additional potential difference ([delta]V1) characterizing healthy function of the sensor and / or a range of values of the electric impedance (Rglass) ofthe glass bulb (3) characterizing a healthy function of the sensor, wherein the ion-sensing circuit is further designed toa) inject a pre-defined electric test current (I1) from the ion-sensing circuit (6) into the loop comprising the reference and the ion-sensitive electrode (5, 2),b) monitor the additional potential difference ([delta]V1) that develops in the loop between the reference and theion-sensitive electrode (5, 2) in reaction to the injection of the test current (I1),c) determine if the additional potential difference ([delta]V1) is within an expected range characterizing healthyfunction of the sensor.

Description

technical field [0001] The present invention relates to a potentiometric sensor assembly comprising an ion sensitive electrode comprising an ion sensitive glass bulb; a reference electrode assembly comprising a reference electrode; and an ion sensing circuit having an ion sensing circuit connected to the ion sensitive electrode a first terminal connected to a reference electrode and a second terminal connected to a reference electrode, said circuit being designed to measure a potential difference generated in a circuit between the reference electrode and the ion-sensitive electrode; also comprising a digital storage unit designed to hold at least a characteristic sensor The range of electrical impedance values ​​of the healthy function of the glass bulb. [0002] The invention also relates to a method for monitoring the sensor function of a potentiometric sensor comprising an ion-sensitive electrode comprising an ion-sensitive glass bulb; a reference electrode assembly compris...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/333G01N27/02G01R27/04
CPCG01N27/26G01N27/333G01N27/02G01N27/041G01N27/4165G01N27/20
Inventor B.卡尔D.阿尔本
Owner ABB (SCHWEIZ) AG
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