A liquid chromatograph includes a liquid sender (2) that sends a plurality of solvents, a mixer (6) that has an internal capacity for mixing the plurality of solvents sent by the liquid sender (2), a sample injector (10) that injects a sample into an analysis flow path (8) through which the solvents mixed in the mixer (6) flow as a mobile phase, a separation column (12) provided on the analysis flow path (10) for separating the sample injected by the sample injector (10) to each component, a detector (14) provided downstream of the separation column (12) on the analysis flow path (8) for detecting the components of the sample separated in the separation column (12), a capacity information storage medium (16) that is attached to the mixer (6) to store information as to the internal capacity of the mixer (6), and a capacity specifier (18) configured to read the information stored in the capacity information storage medium (16) to specify the internal capacity of the mixer (6).

Provided is a unit-type analyzer (1) including: a system controller (80); a plurality of analyzing units (60), with each analyzing unit including a main power switch (70) configured to turn on and off electric power to the analyzing unit, and a software switch (66) provided separately from the main power switch configured to turn on and off a communication with the system controller; and a software-switch operation-mode setter (65) configured to perform a setting for enabling or disabling an operation on the software switch included in each analyzing unit.

A gas chromatograph includes first and second sample vaporization units, first and second separation columns, first and second carrier gas suppliers, a column oven that contains the first and second separation columns and has a first heater, first and second detectors, a first auxiliary gas supplier that supplies an auxiliary gas to the first separation column and a controller that executes control by increasing a supply pressure of an auxiliary gas applied by the first auxiliary gas supplier to a pressure higher than a pressure during an analysis of a sample and lowering a supply pressure of a carrier gas applied by the first carrier gas supplier to a pressure lower than a pressure during the analysis of the sample such that the supply pressure of the auxiliary gas is higher than the supply pressure of the carrier gas, and sets a first maintenance switch mode in which the first sample vaporization unit is maintainable.

A liquid leak detection device is used in an oven. The oven has an oven casing having a sealed inner space provided with a sample flow path through which a liquid sample flows and a heater provided in the inner space that heats the inner space. The liquid leak detection device includes a gas sensor that is provided in the inner space and detects a liquid sample that has leaked from the sample flow path to the inner space and has been evaporated. The liquid leak detection device further includes a liquid leak pipe path that communicates with the inner space and leads a non-vaporized liquid sample that has leaked from the sample flow path to the inner space out of the oven casing, and a liquid sensor that is provided outside of the oven casing and detects a liquid sample led out by the liquid leak pipe path.

When a column is attached to an attachment location, first, a ferrule through which the column is inserted is heated and thus is fixed to the column. Then, the column to which the ferrule is fixed is attached to the attachment location. As described, when a user performs work of attaching the column to the attachment location, the ferrule is always fixed to a certain spot of the column. Therefore, it is possible to omit work of holding the ferrule such that the position of the ferrule with respect to the column does not shift when the work of attaching the column is performed. As a result, the column can be easily attached to the attachment location.

A detector for a liquid chromatograph includes a detector that detects components in liquid, and a heat exchanger that adjusts a temperature of liquid introduced into the detector, wherein the heat exchanger includes a pipe having a winding portion, and a cast in which the winding portion is embedded, the pipe is formed of resin, and the cast is formed of an alloy having a melting point lower than a continuous use temperature of the resin.

A detector for a chromatograph includes a light source, and a light detector that detects light generated based on turning on of the light source, wherein the light source includes a deuterium lamp, and a deuterium lamp power supply circuit connected to the deuterium lamp, and the deuterium lamp power supply circuit includes a DC voltage generation circuit that generates a DC voltage by performing a switching operation, a rectifying operation and a smoothing operation, a voltage application circuit that applies a DC voltage generated by the DC voltage generation circuit to the deuterium lamp, a first feedback circuit that feeds a first feedback voltage changing depending on a DC voltage to the DC voltage generation circuit such that the DC voltage generated by the DC voltage generation circuit becomes close to a discharge maintaining voltage, after electric discharge of the deuterium lamp is started, and a constant current control circuit that controls a discharge current of the deuterium lamp to be constant.

A flow-path member through which a sample flows in an analysis device includes a pipe and a covering member that covers the pipe. The pipe has a first portion including a first direction, which is orthogonal to a direction in which the flow-path member extends as a whole, as at least an element of a local extending direction, a second portion including a second direction, which is opposite to the first direction, as at least an element of a local extending direction, a first bent portion in which a local extending direction changes from the first portion to the second portion, and a second bent portion in which a local extending direction changes from the second portion to the first portion. A space is formed between the covering member and the pipe at least in the first portion and the second portion.

A gas chromatograph includes a sample introduction unit configured to introduce a vaporized sample into a separation column together with a carrier gas, a detection unit configured to detect a gas emitted from the separation column, and a catalyst processing unit. The catalyst processing unit includes a catalyst configured to introduce a gas containing the carrier gas discharged from the sample introduction unit or the detection unit to oxidize the hydrogen gas.

A gas chromatograph includes an oven that has a first heater device and a second heater device. The first heater device and the second heater device are connected in series when a voltage of a power supply is a first voltage, and are connected in parallel when the voltage of the power supply is a second voltage that is lower than the first voltage. A power controller includes a first control device that controls ON/OFF of supply of power to the series-connected first heater device and second heater device or ON/OFF of supply of power to the parallel-connected first heater device, and a second control device that controls ON/OFF of supply of power to the parallel-connected second heater device. A controller adjusts a duty ratio of supply of power to the parallel-connected first heater device and second heater device by controlling the first control device and the second control device when the voltage of the power supply is the second voltage.