US 12,085,551 B2
Water quality analyzer
Yoshio Kitada, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/420,239
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Oct. 3, 2019, PCT No. PCT/JP2019/039119
§ 371(c)(1), (2) Date Jul. 1, 2021,
PCT Pub. No. WO2020/144902, PCT Pub. Date Jul. 16, 2020.
Claims priority of application No. 2019-003149 (JP), filed on Jan. 11, 2019.
Prior Publication US 2022/0065839 A1, Mar. 3, 2022
Int. Cl. G01N 33/18 (2006.01); G01N 1/14 (2006.01); G01N 21/33 (2006.01)
CPC G01N 33/18 (2013.01) [G01N 1/14 (2013.01); G01N 21/33 (2013.01); G01N 2201/06113 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A water quality analyzer comprising:
a sample reservoir including a first storage container configured to temporarily store sample water supplied from a sample water source, and a discharge mechanism configured to discharge the sample water to an outside of the first storage container;
at least one second storage container provided as a container different from the first storage container for storing the sample water;
a measurement device including a measurement cell for accommodating sample water, the measurement device being configured to obtain a measured value of a physical quantity related to the sample water accommodated in the measurement cell;
a pump configured to suction and discharge a liquid, wherein the pump is selectively and fluidly connected to the first storage container in a first state, the second storage container in a second state, and the measurement cell in a third state via a switching device;
wherein the switching device is configured to switch fluidly connection of the pump with the first storage container, the second storage container and the measurement cell;
a determination part configured to determine whether the measured value is normal or abnormal by comparing the measured value with a preset threshold;
a measurement controller configured to transfer the sample water stored in the first storage container to the measurement cell using the pump and to perform measurement of the sample water by controlling an operation of the pump and an operation of the switching device;
a first storage controller configured to control an operation of the sample reservoir,
wherein the first storage controller is configured, after a portion of the sample water stored in the first storage container is supplied to the measurement cell by the pump, to make the sample water stored in the first storage container to remain in the first storage container until the determination part determines the measured value of the sample water which has supplied to the measurement cell, and
wherein the first storage controller is configured to discharge the sample water remaining in the first storage container to the outside of the first storage container in a case where the determination part determines that the measured value obtained by the measurement device is normal; and
a second storage controller configured to transfer the sample water remaining in the first storage container to the second storage container via the switching device in a case where the determination part determines that the measured value obtained by the measurement device is abnormal,
wherein the measurement controller is configured, when an instruction to perform measurement of the sample water stored in the second storage container is inputted to the measurement controller, to control an operation of the pump and an operation of the switching device so that the sample water stored in the second storage container is transferred finally to the measurement cell and is measured.