US 11,988,622 B2
Water quality analyzer that monitors pressure and temperature to abnormality
Kenichi Nakadozono, Kyoto (JP); and Takeshi Iharada, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/414,380
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Sep. 26, 2019, PCT No. PCT/JP2019/037952
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/129347, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-239247 (JP), filed on Dec. 21, 2018.
Prior Publication US 2022/0050070 A1, Feb. 17, 2022
Int. Cl. G01N 25/24 (2006.01); G01N 33/18 (2006.01)
CPC G01N 25/24 (2013.01) [G01N 33/18 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A water quality analyzer comprising:
a combustion tube for burning a liquid sample inside;
a sample injector that executes sample injection operation into the combustion tube;
a pressure sensor that detects pressure inside the combustion tube;
a temperature sensor that detects a temperature of the combustion tube; and
a determination part configured to determine whether the combustion tube and/or the sample injector is normal or abnormal based on an output of the pressure sensor and an output of the temperature sensor immediately after execution of the sample injection operation by the sample injector, wherein
the determination part is configured to detect presence or absence of a fluctuation in an output of the pressure sensor and presence or absence of a fluctuation in an output of the temperature sensor immediately after execution of the sample injection operation by the sample injector, and, based on a result of the detection, determine whether the combustion tube and/or the sample injector is normal or abnormal, and
the determination part is configured to determine that the combustion tube and the sample injector are normal when detecting a fluctuation in the output of the pressure sensor, to determine that the combustion tube is abnormal and the sample injector is normal when detecting only a fluctuation in the output of the temperature sensor, and to determine that the sample injector is abnormal when not detecting any fluctuation in either the output of the pressure sensor or the output of the temperature sensor.