JPWO2023218672A5

JPWO2023218672A5 -

Info

Publication number: JPWO2023218672A5
Application number: JP2023574542A
Authority: JP
Filing date: 2022-05-13
Publication date: 2024-04-19

Description

図６の例では、濁度の測定に用いる透過光量と、汚れの測定に用いる透過光量とを、共通の透過光検出部７０で検出できる。また、濁度の測定に用いる光源１０と、汚れの測定に用いる光源１０とを共通化できる。このため、水質分析装置１００の構成部材を少なくできる。 6, the amount of transmitted light used to measure turbidity and the amount of transmitted light used to measure contamination can be detected by a common transmitted light detector 70. Also, the light source 10 used to measure turbidity and the light source 10 used to measure contamination can be a common light source. This allows the number of components of the water quality analyzer 100 to be reduced.

Claims

A water quality analyzer for measuring a concentration of a measurement target substance contained in a water sample, comprising:
a flow cell having a light-transmitting wall and an internal space surrounded by the wall, the sample water passing through the internal space;
A light source that irradiates light toward the flow cell;
a light source monitor for detecting a light source amount, which is an amount of light emitted by the light source;
a transmitted light detector for detecting an amount of transmitted light, which is an amount of light transmitted through the flow cell;
and a dirt detection unit that detects dirt on the wall portion of the flow cell based on the amount of light from the light source and the amount of transmitted light.

The water quality analyzer according to claim 1 , wherein the dirt detection unit detects dirt on the wall portion based on a ratio between an amount of light from the light source and an amount of transmitted light.

A cleaning unit that cleans dirt from the wall of the flow cell,
The water quality analyzer according to claim 1 , wherein the dirt detection unit determines whether or not cleaning of the flow cell has been completed based on the amount of light from the light source and the amount of transmitted light detected after cleaning of the flow cell.

The water quality analyzer according to claim 3 , wherein the dirt detection unit outputs a notification indicating that cleaning is not completed when cleaning of the flow cell is not completed within a set period from the start of cleaning of the flow cell.

The water quality analyzer according to claim 3 , wherein the dirt detection unit changes a cleaning method in the cleaning unit when cleaning of the flow cell is not completed within a set period from the start of cleaning.

The water quality analyzer according to claim 3 , wherein the cleaning unit selects a cleaning method for the flow cell based on at least one of the amount of light from the light source and the amount of transmitted light.

The water quality analyzer according to claim 6 , wherein the cleaning unit adjusts a pH of the cleaning liquid flowing through the flow cell based on a ratio between the amount of light from the light source and the amount of transmitted light.

The water quality analyzer according to claim 3 , wherein the cleaning unit selects a cleaning method for the flow cell based on a history of the sample water that has been flowed through the flow cell in the past.

The water quality analyzer according to claim 1 , wherein the dirt detection unit detects dirt on the wall portion by using the amount of transmitted light when the sample water is not flowing through the flow cell.

The water quality analyzer according to claim 1 , wherein the dirt detection unit detects dirt on the wall portion by using the amount of transmitted light when the sample water is flowing through the flow cell.

A scattered light detector is further provided for detecting an amount of scattered light, which is an amount of light scattered from the water sample.
The water quality analyzer according to claim 10 , wherein the dirt detection unit detects dirt on the wall of the flow cell further based on the amount of scattered light.

The water quality analysis device of claim 11, further comprising a turbidity measuring unit that measures the turbidity of the sample water based on at least one of the amount of scattered light detected by the scattered light detection unit and the amount of transmitted light detected by the transmitted light detection unit.

A cleaning unit that cleans dirt from the wall of the flow cell,
the dirt detection unit detects dirt on the wall portion by using the amount of transmitted light in a state in which the sample water is flowing through the flow cell;
The cleaning unit starts cleaning the flow cell when the wall portion is dirty.
The water quality analysis device according to claim 1 .

The dirt detection unit further includes a scattered light detection unit that detects an amount of scattered light, which is an amount of light scattered from the sample water, and detects dirt on the wall of the flow cell on the condition that the turbidity of the sample water measured based on at least one of the amount of scattered light detected by the scattered light detection unit or the amount of scattered light detected by the scattered light detection unit and the amount of transmitted light detected by the transmitted light detection unit is equal to or less than a reference value.
The water quality analysis device according to claim 13.