A fluid modulator includes a fluid manifold, fluid valve, and pressure/flow controller. The manifold may include a primary tee, exhaust tee, secondary tee, loop conduit, and joining tube. The valve may include a common port, normally-open output port connected to the secondary tee, and normally-closed output port connected to the primary tee. The controller may be configured to provide auxiliary fluid to the common port. In embodiments, the primary tee, exhaust tee, and secondary tee are configured with the primary tee and secondary tee situated at ends of the fluid manifold and the exhaust tee disposed therebetween. In other embodiments, the exhaust tee, the primary tee, and the secondary tee are distributed in a linear fashion with the exhaust tee and secondary tee situated at ends of the fluid manifold and the primary tee disposed therebetween. An embodiment with a single, unitary 5-port fluid manifold is also disclosed.

A gas chromatograph that includes a metering chamber, two separating devices and a multiport valve unit having switching functions for metering, straight separation, cutting and backflush, where the multiport valve unit is formed as a multiport diaphragm valve.

A trace detection device including: an ion mobility tube ; a sampling gas path module ; a sample injection gas path module configured to introduce a sample carrier gas containing a sample collected by the sampling gas path module toward the ion mobility tube; and a gas chromatography apparatus capable of pre-separating the sample carrier gas, so as to form a pre-separated sample carrier gas; wherein the sample injection gas path module is further configured to be capable of switching between a first mode and a second mode, in the first mode, the sample injection gas path module introduces the sample carrier gas into the ion mobility tube; and in the second mode, the sample injection gas path module introduces the sample carrier gas into the gas chromatography apparatus to pre-separate the sample carrier gas, and the pre-separated sample carrier gas is introduced into the ion mobility tube.

Provided are an odor sniffing device (11) and a vehicle-mounted security inspection apparatus for a container (1). The odor sniffing device (11) includes a primary sampling front end (116), which has a vent adapter (116-1) having a shape matching with a vent of the ventilator of the container, so that when the primary sampling front end (116) fits with the ventilator, the vent adapter (116-1) and the vent generally cooperate to achieve fluid communication. The vehicle-mounted security inspection apparatus (1) may perform imaging inspection and chemical inspection simultaneously.

Disclosed are a mutually independent dual online liquid chromatography device and a control method thereof. The mutually independent dual online liquid chromatography device according to the present disclosure includes a first pump configured to inject a first solvent or a mixed solution containing the first solvent and a second solvent; a second pump configured to inject the first solvent or the mixed solution containing the first solvent and the second solvent; a sample inlet valve to which the first pump and a sample injector configured to inject a sample are connected; a first column valve to which a first sample separation column is connected; a second column valve to which a second sample separation column is connected; and a column selection valve to which the second pump is connected, and interposed between the sample inlet valve, and the first column valve and the second column valve to inject the sample fed from the sample inlet valve onto any one of the first sample separation column and the second sample separation column to separate and analyze the sample in one sample separation column while allowing for wash and equilibration, sample injection and isocratic elution of the other sample separation column.

Injector (40) for injecting a fluidic sample into a mobile phase in a sample separation apparatus (10), the injector (40) comprising a main flow path (100) between a fluid drive (20) and a sample separation device (30), wherein the fluid drive (20) is adapted to drive the mobile phase and the sample separation device (30) is adapted to separate the fluidic sample that is injected into the mobile phase, a discharge device (104) for discharging an, in particular predetermined, amount of the mobile phase from the main flow path (100), and a supply device (102) for supplying an, in particular predetermined, amount of the fluidic sample and/or of a solvent into the main flow path (100), wherein the discharged amount and the supplied amount compensate each other at least partially.

A microfluidic device and a method for mixing liquids by moving the liquids back-and-forth between a chamber of a piston pump and a cavity of a spectrophotometric measuring cell. The disclosure also relates to physicochemical analysis of a mixture directly within the microfluidic device wherein the mixture is obtained using the method described herein. The disclosure also relates to a device and a method for sampling liquids remotely.

The present invention relates to a valve unit (100) for a chromatography apparatus, the valve unit comprising a fluid inlet (110) configured to receive an input fluid, a fluid outlet (120) configured to provide an output fluid, a first pair of fluid ports (131,132) configured to be coupled to a first column, a second pair (141,142) of fluid ports configured to be coupled to a second column, a coupling valve assembly (200) configured to direct fluid between a selection of the fluid inlet (110), the fluid outlet (120), the first pair of fluid ports (131,132) and the second pair of fluid ports (141,142) in response to one or more control signals, wherein the coupling valve assembly is configured to direct fluid using a selection of membrane valves coupled by fluid channels comprised in a body of the coupling valve assembly. The invention further relates to a chromatography apparatus comprising the valve unit and a membrane valve comprised in the valve unit.

An autosampler sets an injection valve to be in a sample filling state when a sample loop is filled with a sample, and, after completion of filling with the sample, switches the injection valve to an intermediate state and first connects only one end of the sample loop to a liquid delivery channel and an analysis channel. After the above, the injection valve is switched to the sample injection state and the sample loop is interposed between the liquid delivery channel and the analysis channel, so that the sample is injected into the analysis channel.

Systems for use with liquid chromatography for provision of continuous flow or gradient flow in connection with two pumps providing mobile phase to a valve.