Measuring device

Patent metadata

Field	Value
Publication number	US-2022065814-A1
Application number	US-202117463772-A
Country	US
Kind code	A1
Filing date	Sep 1, 2021
Priority date	Sep 3, 2020
Publication date	Mar 3, 2022
Grant date	—

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, and the motor changes a rotational velocity of the motor.

2 . The measuring device according to claim 1 , wherein
the motor:
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 a rotation of the motor and causes the rotational velocity to be alternately changed between a positive value and a negative value.

3 . The measuring device according to claim 2 , wherein
the controller operates in a cleaning mode where 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 rotation of the motor and causes the rotational velocity to be alternatingly changed between a positive value and a negative value.

4 . The measuring device according to claim 1 , wherein
the controller operates in a standby mode where the concentration of a measurement target in the sample water is not calculated, and when the controller operates in the standby mode, the controller controls a rotation of the motor and causes a first absolute value of the rotational velocity when operating in the standby mode to be smaller than a second absolute value of the rotational velocity when operating in the measuring mode.

5 . The measuring device according to claim 4 , wherein when the controller operates in the standby mode, the controller stops the motor.

6 . 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 a rotation of the motor and causes a third absolute value of the rotational velocity when operating in the breaking to be larger than a second absolute value of the rotational velocity when operating in the measuring mode.

7 . 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.

8 . The measuring device according to claim 2 , wherein
the controller operates in a standby mode where the concentration of a measurement target in the sample water is not calculated, and when the controller operates in the standby mode, the controller controls a rotation of the motor and causes a first absolute value of the rotational velocity when operating in the standby mode to be smaller than a second absolute value of the rotational velocity when operating in the measuring mode.

9 . The measuring device according to claim 3 , wherein
the controller operates in a standby mode where the concentration of a measurement target in the sample water is not calculated, and when the controller operates in the standby mode, the controller controls a rotation of the motor and causes a first absolute value of the rotational velocity when operating in the standby mode to be smaller than a second absolute value of the rotational velocity when operating in the measuring mode.

10 . 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 a rotation of the motor and causes a third absolute value of the rotational velocity when operating in the breaking to be larger than a second absolute value of the rotational velocity when operating in the measuring mode.

11 . 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 a rotation of the motor and causes a third absolute value of the rotational velocity when operating in the breaking to be larger than a second absolute value of the rotational velocity when operating in the measuring mode.

12 . The measuring device according to claim 4 , 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 a rotation of the motor and causes a third absolute value of the rotational velocity when operating in the breaking to be larger than a second absolute value of the rotational velocity when operating in the measuring mode.

13 . The measuring device according to claim 5 , 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 a rotation of the motor and causes a third absolute value of the rotational velocity when operating in the breaking to be larger than a second absolute value of the rotational velocity when operating in the measuring mode.

14 . 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.

15 . 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.

16 . The measuring device according to claim 4 , 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.

17 . The measuring device according to claim 5 , 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.

18 . The measuring device according to claim 6 , 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

• G01N27/38 Primary

  Cleaning of electrodes · CPC title

• G01N27/406

  Cells and probes with solid electrolytes · CPC title

• G01N27/4168 Primary

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

• G01N27/283 Primary

  Means for supporting or introducing electrochemical probes · CPC title

• G01N33/182

  Specific anions in water · CPC title