Abstract: An evaporative concentration mechanism is achieved, which accurately evaporates and concentrates a small quantity of a sample liquid for a short period of time, regardless of the composition of the sample liquid or the surrounding environmental conditions. The evaporative concentration mechanism includes a container that accommodates a sample liquid; a heating unit that heats the container; a liquid level sensor that detects a liquid level height of the sample liquid accommodated in the container; and a control unit that controls a temperature of the heating unit, in which the control unit controls the temperature of the heating unit based on a liquid level of the sample liquid detected by the liquid level sensor. Accordingly, a small quantity of a sample liquid can be accurately evaporated and concentrated for a short period of time, regardless of the composition of the sample liquid or the surrounding environmental conditions.

Abstract: A column connection method of a liquid chromatograph and a liquid chromatograph capable of keeping a mistakenly installed column by an operator as an unused column are provided. The column connection method of the liquid chromatograph includes: a first step of installing a column at a column installation part and obtaining a first reading result by reading identification information of the column before connecting the column with an analysis flow path; and a second step of connecting the column with the analysis flow path and obtaining a second reading result by reading identification information of the column, in which the first reading result is compared with the second reading result to judge identity of the column.

Abstract: Provided is a technology for reducing the capacity of a liquid feeding pump and enabling liquid feeding with little pulsation. A liquid feeding pump according to the present disclosure is provided with: a first plunger pump having a first plunger; a second plunger pump having a second plunger and connected in series with the first plunger pump; a pressure sensor disposed downstream of the second plunger pump; and a control unit that accepts the input of a liquid discharge pressure measured by the pressure sensor and that controls the driving of the first plunger and the driving of the second plunger.

Abstract: The present invention provides a technique that enables liquid feeding with small pulsation by reducing the volume of a liquid feeding pump. Disclosed is a liquid feeding pump comprising: a first plunger pump that has a first plunger; a second plunger pump that has a second plunger and is connected to the first plunger pump in series; a pressure sensor that is disposed on the downstream side of the second plunger pump; and a control unit that accepts an input of the discharge pressure of a liquid measured by the pressure sensor to control driving of the first plunger and driving of the second plunger, wherein when the first plunger pump compresses the liquid, the control unit drives the first plunger at a first speed, and then decreases the speed to a second speed slower than the first speed before the compression is completed, and wherein the control unit discharges the liquid from the second plunger pump by driving the second plunger in parallel with the driving of the first plunger.