Measuring device

Patent metadata

Field	Value
Publication number	US-11946899-B2
Application number	US-202117463772-A
Country	US
Kind code	B2
Filing date	Sep 1, 2021
Priority date	Sep 3, 2020
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A measuring device includes: a first electrode and a second electrode immersed in sample water stored in a measuring tank; a motor that rotates the first electrode; and a controller that operates, based on measurement results of current flowing through the sample water, in a measuring mode. In the measuring mode, the controller calculates a concentration of a measurement target in the sample water. The motor changes a rotational velocity of the motor.

First claim

What is claimed is:

1. A measuring device, comprising:
a first electrode and a second electrode immersed in sample water stored in a measuring tank;
a motor that rotates the first electrode; and
a controller that operates, based on measurement results of current flowing through the sample water, in a measuring mode, wherein
in the measuring mode, the controller calculates a concentration of a measurement target in the sample water,
the motor changes a rotational velocity of the first electrode,
the controller operates in a standby mode wherein the concentration of the measurement target in the sample water is not calculated, and
when the controller operates in the standby mode, the controller controls the motor such that a first absolute value of the rotational velocity when operating in the standby mode is larger than zero and smaller than a second absolute value of the rotational velocity when operating in the measuring mode.

2. The measuring device according to claim 1 , wherein
the first electrode:
rotates either clockwise or counterclockwise as a forward direction when the rotational velocity is a positive value; and
rotates in a direction opposite to the forward direction when the rotational velocity is a negative value, and
the controller controls the motor such that the rotational velocity is alternately changed between the positive value and the negative value.

3. The measuring device according to claim 2 , wherein
the controller operates in a cleaning mode wherein the first electrode is cleaned, and
when the controller operates in at least one mode of the measuring mode or the cleaning mode, the controller controls the motor such that the rotational velocity is alternatingly changed between the positive value and the negative value.

4. The measuring device according to claim 3 , further comprising:
granular members disposed inside the measuring tank and that contact a surface of the first electrode, wherein
the controller operates in a breaking mode after the granular members are replaced, and
the controller controls the motor such that a third absolute value of the rotational velocity when operating in the breaking mode is larger than the second absolute value.

5. The measuring device according to claim 3 , wherein the controller controls the rotational velocity based on a magnitude of a current flowing in a standard sample water having a known measurement target concentration.

6. The measuring device according to claim 2 , further comprising:
granular members disposed inside the measuring tank and that contact a surface of the first electrode, wherein
the controller operates in a breaking mode after the granular members are replaced, and
the controller controls the motor such that a third absolute value of the rotational velocity when operating in the breaking mode is larger than the second absolute value.

7. The measuring device according to claim 2 , wherein the controller controls the rotational velocity based on a magnitude of a current flowing in a standard sample water having a known measurement target concentration.

8. The measuring device according to claim 1 , further comprising:
granular members disposed inside the measuring tank and that contact a surface of the first electrode, wherein
the controller operates in a breaking mode after the granular members are replaced, and
the controller controls of the motor such that a third absolute value of the rotational velocity when operating in the breaking mode is larger than the second absolute value.

9. The measuring device according to claim 8 , wherein the controller controls the rotational velocity based on a magnitude of a current flowing in a standard sample water having a known measurement target concentration.

10. The measuring device according to claim 1 , wherein the controller controls the rotational velocity based on a magnitude of a current flowing in a standard sample water having a known measurement target concentration.

Assignees

• Yokogawa Electric Corp

Inventors

• Kyakuno Toshihiko
• Goto Megumi

Classifications

• G01N27/4168 Primary

  Oxidation-reduction potential, e.g. for chlorination of water (water analysis G01N33/18) · CPC title

• G01N27/38 Primary

  Cleaning of electrodes · CPC title

• G01N27/283 Primary

  Means for supporting or introducing electrochemical probes · CPC title

• G01N27/406

  Cells and probes with solid electrolytes · CPC title

• G01N27/49

  Systems involving the determination of the current at a single specific value, or small range of values, of applied voltage for producing selective measurement of one or more particular ionic species · CPC title