A liquid delivery pump includes a primary plunger pump, a secondary plunger pump fluidly connected in series downstream of the primary plunger pump, and a pressure sensor that detects a system pressure. The liquid delivery pump further includes a liquid delivery control part configured to execute first constant pressure control in a first constant pressure control term and to execute second constant pressure control in a second constant pressure control term. The first constant pressure control term is a term, which is in a liquid delivery cycle consisting of the primary discharge process and the secondary discharge process, in which the primary discharge process is executed, the second constant pressure control term is a part of a term in which the secondary discharge process is executed, and the second constant pressure control term is including a term that is continuous after the first constant pressure control term.

The invention features compact systems and methods for vacuum liquid purification and extraction of a liquid sample.

The invention features compact systems and methods for vacuum liquid purification and extraction of a liquid sample.

A sorbent tube apparatus (10) for high-pressure fluid sample analysis, the sorbent tube apparatus (10) comprising a pressurisable housing (32) having first and second fluid ports (48a, 48b) and defining a fluid chamber (34) therein; and a sorbent tube (12) mountable within the pressurisable housing (32), the sorbent tube (12) extending from one of the first and second fluid ports (48a) and spaced apart from the other of the first and second fluid ports (48b) to be in fluid communication with the fluid chamber (34), thereby enabling in use pressure equalisation between the sorbent tube (12) and fluid chamber (34). A method of analysing high-pressure fluid, an analytic probe apparatus, a further sorbent tube apparatus and method of preventing or limiting damage to a sorbent tube during high-pressure fluid sampling are also provided.

An apparatus for making isotopic ethane measurements of a gas sample includes a tunable infrared laser configured to emit an infrared laser beam; an infrared sensor configured to receive the infrared laser beam; a gas cell deployed in a path between the tunable infrared laser and the infrared sensor such that the infrared laser beam passes through the gas cell, the gas cell configured to receive the gas sample; and a controller configured to evaluate the received infrared laser beam to estimate a ratio of C13 ethane to C12 ethane in the gas sample.

In the non-volatile storage unit (341) of the local control unit (34) of each unit (3 to 6) configuring an LC system, periodic inspection information, such as the installation date and the next inspection scheduled date, is stored at an appropriate time. When an analysis is carried out, in the system control unit (2) which controls each unit, a periodic inspection notification processing unit (211) collects periodic inspection information from each unit (3 to 7) upon power on or start up, compares the next inspection scheduled date with the current time by the real-time clock (212), and determines a unit for which a periodic inspection notification is required. If there is a unit that requires a periodic inspection notification, a notification request is sent to the unit, and the local control unit (34) of the unit outputs an indication prompting periodic inspection to the display unit (35). As a result, even if the installation times are different for each unit and even if each unit does not have a real-time clock, it is possible to notify a user when a predetermined age of service has passed from the installation time of a given unit.

A slurry chamber is fastened to and held in coaxial alignment with a chromatography column by a V-band. One end of the column has an end cap and frit. A slurry of fluid and chromatographic media is placed in the column and chamber. A piston is forced through the chamber and into the column by a hydraulic ram to expel the fluid and form a media bed in the column. The slurry chamber is removed, and a split end cap is fastened to the column. A threaded recess in the split end cap receives a split, threaded collet. The collet is tightened until it pushes against the piston with the same force as the ram, at which point the ram is released and the column removed for use.

An apparatus for making isotopic ethane measurements of a gas sample includes a tunable infrared laser configured to emit an infrared laser beam; an infrared sensor configured to receive the infrared laser beam; a gas cell deployed in a path between the tunable infrared laser and the infrared sensor such that the infrared laser beam passes through the gas cell, the gas cell configured to receive the gas sample; and a controller configured to evaluate the received infrared laser beam to estimate a ratio of C13 ethane to C12 ethane in the gas sample.

A dynamic axial compression column is disclosed herein. This dynamic axial column utilized external compression to prevent the creation of end plate space in the column. The dynamic axial column can include a tube defining a first opening, a second opening, and a lumen extending there between. The dynamic axial column can include a first end plate assembly sealing the first opening and movably extending at least partially into the lumen via the first opening, a second end plate assembly sealing the second opening, a plurality of rods extending along the outside of the tube and connecting the first end plate assembly and the second end plate assembly, and a first plurality of compression devices external to the tube and engaging one of the plurality of rods to bias the first end plate assembly towards the second end plate assembly.

Systems and methods are provided for performing washing of columns in a simulated moving bed chromatography system while separation is being performed in the system.