Patent ID: 11860142
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A liquid chromatograph mass spectrometer, comprising:
a first flow path that passes through a separation column;
a second flow path that does not pass through the separation column;
a mass spectrometry unit that is provided on a downstream side of the first flow path and the second flow path and analyzes a sample that has passed through the first flow path;
a first valve that connects any one of the first flow path and the second flow path to the mass spectrometry unit;
a first liquid feed pump that feeds liquid to the first flow path;
a second liquid feed pump that feeds liquid to the second flow path;
a controller that controls driving of the first valve, the first liquid feed pump, and the second liquid feed pump; and
a pressure gauge that measures a pressure of the second flow path and outputs the pressure to the controller,
wherein the controller is programmed to
connect the first flow path to the mass spectrometry unit when the sample is analyzed in the mass spectrometry unit and feed liquid to the mass spectrometry unit from the first liquid feed pump through the first flow path, and
connect the second flow path to the mass spectrometry unit, and drive the first valve, the first liquid feed pump, and the second liquid feed pump to feed liquid from the second liquid feed pump to the mass spectrometry unit through the second flow path in a case where it is determined to be abnormal when a measured value of the mass spectrometry unit and a predetermined threshold value are compared.