Shimadzu Corporation

Dainippon Screen Mfg. Co., Ltd.

Masanori Fujiwara

Katsumasa Sakamoto

Kumiko Jingu

Tomoyuki Yamazaki

Yusuke Nagai

Masato Watanabe

Keisuke Ogawa

Masami Tomita

Yutaka Kono

Ryuhei Sumida

In an ion chromatograph, a sample that is included in an eluent and is to be measured is separated into ion species components by a separation column. An electrode liquid to be introduced into an input port is branched by a three-way valve and is discharged from each of a first output port and a second output port. An eluent from the separation column passes through an eluent flow path of an ion suppressor. An electrode liquid from the first and second output ports passes through each of an anode-side flow path and a cathode-side flow path of the ion suppressor. Ion exchange is performed by electrolysis between an eluent that passes through the eluent flow path and an electrode liquid that passes through the anode-side flow path and the cathode-side flow path, and a sample that passes through the eluent flow path and is separated by the separation column is detected by a detector. A backward flow of an electrode liquid in the cathode-side flow path is suppressed by a backward flow suppression mechanism.

Ion chromatograph

First and second electrode liquid seal members are arranged between a first electrode and a second electrode. First and second ion exchange membranes are arranged between the first electrode liquid seal member and the second electrode liquid seal member. An eluent seal member is arranged between the first ion exchange membrane and the second ion exchange membrane. A plurality of first mesh members having different charge amounts are stacked in a first electrode liquid flow path of the first electrode liquid seal member. Each of the plurality of first mesh members is constituted by a first wire group composed of a plurality of first wires and a second wire group composed of a plurality of second wires crossing the first wire group. The plurality of first wire groups of the plurality of first mesh members respectively extend in different directions, and the plurality of second wire groups of the plurality of first mesh members respectively extend in different directions and extend in directions different from those of the plurality of first wire groups.

Ion suppressor

First and second flow-path portions are opposite to each other, and communicate with each other such that a direction in which an eluent flows through the first flow-path portion and a direction in which an eluent flows through the second flow-path portion are opposite to each other. First and second electrode liquid flow paths are respectively opposite to the first and second flow-path portions. First and second electrode liquids are respectively supplied to the first and second electrode liquid flow paths, such that a direction in which the first electrode liquid flows through the first electrode liquid flow path is same as a direction in which an eluent flows through the first flow-path portion and a direction in which the second electrode liquid flows through the second electrode liquid flow path is same as a direction in which an eluent flows through the second flow-path portion.

Ion chromatograph and ion component analysis method

An ion suppressor includes ion exchange membranes between a pair of electrodes. Regeneration liquid channels are provided in the spaces between the electrodes and the ion exchange membranes, and an eluent channel is provided between the ion exchange membranes. In the space between the electrode and the eluent channel, an element that increases the resistance in the voltage application direction is disposed. For example, ion permeable membranes are disposed in contact with the ion exchange membrane, thereby increasing the resistance in the voltage application direction.

Ion suppressor and ion chromatograph

An embodiment of a refractive index detector includes a sample cell, a reference cell, a measurement section, a liquid inlet port, liquid outlet sections, and a switching mechanism. The inlet port leads to a sample cell inlet. A first outlet port and a second outlet port are for discharging a liquid. The switching mechanism includes a reference liquid supply mode for forming a channel for connecting a reference cell outlet to one of the first outlet port and the second outlet port while connecting a sample cell outlet to a reference cell inlet, and an analysis mode for forming a channel for connecting the sample cell outlet to one of the first outlet port and the second outlet port while sealing the reference cell outlet.

Refractive index detector and liquid chromatograph

A degassing deviceincludes: a built-in absorbance measurement sectionusing an LED light source and measuring the intensity of light transmitted through a mobile phase passing through a flow cell; and a solenoid valveswitchable between two states with and without the mobile phase passed through a degassing tube. The passage-switching operation by the solenoid valve is performed so as to obtain detection signals of the transmitted light in the absorbance measurement section when the mobile phase drawn from a mobile phase container by a liquid-feeding pumpis passed through the degassing tube for degassing as well as when the mobile phase is not passed through the degassing tube for degassing. A signal processorcalculates the difference in absorbance based on those detection signals, estimates the degree of degassing based on that difference, and displays the result on a display unit

Degassing device

A differential refractometer including a measurement section for measuring the diffractive index difference between a sample cell and a reference cell by radiating light on a measurement cell and detecting light which has sequentially passed through the sample cell and the reference cell includes a mobile phase supply section for delivering a mobile phase in a sample introduction channel that is connected to the sample cell. The mobile phase supply section includes a mobile phase container for containing the mobile phase. The inside of the mobile phase container is continuously stirred by a stirring mechanism, and the composition of the mobile phase inside the mobile phase container is made uniform.

Measurement method using differential refractometer, differential refractometer using the measurement method, and liquid chromatograph

Provided is an optical analyzer for performing a feedback control on the amount of light emitted from an LED as a light source, in which the configuration of an optical system is made simple and the degree of freedom in optical system arrangement is secured. An optical memberfor focusing most of light while discharging part of the light as unfocused light is provided on an optical path from a light casting unitto a sample cell. The optical membercan be achieved with a simple configuration, for example, two ball lenses spaced apart by a predetermined distance from each other. The light focused by the optical memberis cast as measurement light into the sample cell. Meanwhile, a second photodetectoris arranged at a position where the unfocused light reaches. The second photodetectorgenerates a detection signal in accordance with the amount of light that has entered the second photodetectoras monitored light, and a drive current to be supplied to an LED is controlled through a drive current controlling unitand a current sourcesuch that the amount of light is maintained at a fixed level.

Optical analyzer

A lubricant supply mechanism is provided to an upper portion of a cam. A fixing member of the lubricant supply mechanism includes a recovery blade as a lubricant recovery member having lower end portions in contact with side face peripheral edge portions of the cam. The lower end portions of the recovery blade are in contact with the side face peripheral edge portions of the cam. An angle &#x3b8;, which the lower end portions of the recovery blade make with a direction of rotation of the cam is smaller than 90&#xb0;.

Cam mechanism and liquid sending pump having same

The ejection positions of a plurality of pre-processing agent ejection nozzles and the ejection positions of a plurality of ink ejection nozzles as seen in a direction orthogonal to the transport direction of a recording medium are in a one-to-one correspondence with each other. A controller causes the process of ejecting ink of a first color from the ink ejection nozzles onto the recording medium subjected to the ejection from the plurality of pre-processing agent ejection nozzles so as to form a failure detection printing pattern which is a printing pattern formed by providing a time lag between the processes of ejecting the ink from adjacent ones of the plurality of ink ejection nozzles. An ejection failure in the pre-processing agent ejection nozzles is detected by judging that a pre-processing agent ejection nozzle corresponding to a region where bleeding results suffers the ejection failure.

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Kyoto, Japan

Masanori Fujiwara