A first mixer mixes solvents therein. A second mixer has a capacity different from that of the first mixer, and mixes solvents therein. A first separation column is associated with the first mixer. A second separation column is associated with the second mixer. A first valve enables switchover between a first communication state in which the first mixer and the first separation column communicate with a detector, and a second communication state in which the second mixer and the second separation column communicate with the detector. Only by switching the first valve, it is possible to switch between the first communication state and the second communication state. The internal capacity of a flow channel in the first communication state differs from that in the second communication state. Therefore, it is easy to perform analysis with different internal capacities.

Described is a dual mode sample manager for a liquid chromatography system. The dual mode sample manager includes a sample needle, a sample loop, a metering pump, a needle seat and first and second valves. Each valve is configurable in two valve states to enable two modes of operation. In one mode, sample acquired and stored in the sample needle is injected into a chromatography system flow and, in the other mode, sample acquired through the sample needle and stored in the sample loop is injected into the chromatography system flow. The automated switching of the sample manager between the two modes of operation avoids the need for maintaining two separate liquid chromatography systems or manual reconfiguration of a chromatography system for users desiring the capability of both modes of operation.

Described is a dual mode sample manager for a liquid chromatography system. The dual mode sample manager includes a sample needle, a sample loop, a metering pump, a needle seat and first and second valves. Each valve is configurable in two valve states to enable two modes of operation. In one mode, sample acquired and stored in the sample needle is injected into a chromatography system flow and, in the other mode, sample acquired through the sample needle and stored in the sample loop is injected into the chromatography system flow. The automated switching of the sample manager between the two modes of operation avoids the need for maintaining two separate liquid chromatography systems or manual reconfiguration of a chromatography system for users desiring the capability of both modes of operation.

A liquid chromatography system includes a solvent delivery system, a sample manager including a sample delivery system in fluidic communication with the solvent delivery system, the sample delivery system configured to inject a sample from a sample-vial into a chromatographic flow stream, a liquid chromatography column located downstream from the sample delivery system, and a detector located downstream from the liquid chromatography column. The sample delivery system further includes a first needle drive including a first sample needle configured to extract the sample from the sample-vial and deliver the sample to the liquid chromatography column, and a first syringe in communication with the first sample needle configured to meter extraction of the sample from the sample-vial. The sample manager further includes a sample automation system that includes a second needle drive including a second sample needle configured to add a volume of reagent to the sample-vial.

A liquid chromatography system includes a solvent delivery system, a sample manager including a sample delivery system in fluidic communication with the solvent delivery system, the sample delivery system configured to inject a sample from a sample-vial into a chromatographic flow stream, a liquid chromatography column located downstream from the sample delivery system, and a detector located downstream from the liquid chromatography column. The sample delivery system further includes a first needle drive including a first sample needle configured to extract the sample from the sample-vial and deliver the sample to the liquid chromatography column, and a first syringe in communication with the first sample needle configured to meter extraction of the sample from the sample-vial. The sample manager further includes a sample automation system that includes a second needle drive including a second sample needle configured to add a volume of reagent to the sample-vial.

A first solution is supplied from a first pump. A second solution is supplied from a second pump. A flow path from the first pump and the second pump to a column is switched between a first flow path and a second flow path. In the first flow path, a first mixer is located upstream of an injection part for a sample, and the second mixer is located downstream of the injection part. In the second flow path, the first mixer and the second mixer are located upstream of the injection part. The first flow path is formed in a first mode in which the sample is diluted before introduction into the column. The second flow path is formed in a second mode in which the sample is not diluted before introduction into the column.

The disclosure includes a gas analysis system comprising a control system. In some embodiments, the control system comprises a computer monitoring host, an underground coal mine gas circuit control box including an intrinsically safe PLC, a sampling pump electrically coupled to the remote power control, an explosion proof safety power box electrically coupled to the intrinsically safe optical fiber switch, and an intrinsically safe gas chromatograph electrically coupled to the intrinsically safe optical fiber switch and the flameproof and intrinsically safe power box. In some embodiments, the gas analysis system comprises a gas pipeline system having an instrument sequence tube coupled to the carrier gas output pressure sensor, the carrier gas proportional solenoid valve, the carrier gas path pressure sensor, a manual carrier gas pressure reducing valve, and a carrier gas storage.

Valve assemblies are described that provide magnetic coupling between a valve actuator and a valve body housing the valve rotor and stator. A valve assembly embodiment, includes, but is not limited to, a valve body, the valve body including at least one magnet, and a rotor and a stator configured to define a plurality of fluid flow passageways; a valve actuator configured to drive the rotor via a drive shaft; and an actuator mount coupled to the valve actuator and configured to magnetically couple with the at least one magnet of the valve body to magnetically couple the valve body and the valve actuator.

The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.

The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.