Abstract: A positive displacement pump (1) is equipped with a pump cylinder (2), a pump piston (7), a cylinder space (9), a pressure sensor (10), and a pressure channel (12). A main portion (13) of the pressure channel (12) extends parallel to a longitudinal axis (3) of the pump cylinder (2), for providing fluidic connection between the cylinder space (9) and the pressure sensor (10). In the improved alternative positive displacement pump (1), the main portion (13) of the pressure channel (12) is located inside of the pump cylinder (2) or pump piston (7) and extends, at least in a foremost position of the pump piston (7), from a cylinder bottom (5) beyond or to an opening (11,11?) in the cylinder wall (4) or pump piston (7).

Abstract: A positive displacement pump (1) is equipped with a pump cylinder (2), a pump piston (7), a cylinder space (9), a pressure sensor (10), and a pressure channel (12). A main portion (13) of the pressure channel (12) extends parallel to a longitudinal axis (3) of the pump cylinder (2), for providing fluidic connection between the cylinder space (9) and the pressure sensor (10). In the improved alternative positive displacement pump (1), the cylinder wall (4) comprises a piston sleeve (14) that is located on the inner side of the cylinder wall (4) and that extends over essentially the entire length of the pump cylinder (2) to the cylinder bottom (5).

Abstract: A positive displacement pump (1) is equipped with a pump cylinder (2), a pump piston (7), a cylinder space (9), a pressure sensor (10), and a pressure channel (12). A main portion (13) of the pressure channel (12) extends parallel to a longitudinal axis (3) of the pump cylinder (2), for providing fluidic connection between the cylinder space (9) and the pressure sensor (10). In the improved alternative positive displacement pump (1), the main portion (13) of the pressure channel (12) is located inside of the pump cylinder (2) or pump piston (7) and extends, at least in a foremost position of the pump piston (7), from a cylinder bottom (5) beyond or to an opening (11,11?) in the cylinder wall (4) or pump piston (7).

Abstract: A positive displacement pump (1) is equipped with a pump cylinder (2), a pump piston (7), a cylinder space (9), a pressure sensor (10), and a pressure channel (12). A main portion (13) of the pressure channel (12) extends parallel to a longitudinal axis (3) of the pump cylinder (2), for providing fluidic connection between the cylinder space (9) and the pressure sensor (10). In the improved alternative positive displacement pump (1), the cylinder wall (4) comprises a piston sleeve (14) that is located on the inner side of the cylinder wall (4) and that extends over essentially the entire length of the pump cylinder (2) to the cylinder bottom (5).

Abstract: In one embodiment, a matrix elimination apparatus for eliminating an acidic matrix includes: at least one column packed with a weak anion exchange resin; a source of samples, each sample having an acidic matrix; a basic solution source; a weakly acidic metal complexing reagent source, and an at least one pump, wherein the matrix elimination apparatus is configured such that the at least one pump can sequence through the acts of: a) pumping the basic solution through the column to regenerate the column, b) pumping the weakly acid metal complexing reagent through the column to activate the column; and c) pumping one of the samples through the activated column to provide a processed sample whose acidic matrix is eliminated.

Abstract: A system and method for fluid dilution is provided, in one example to be used in conjunction with a chemical analysis tool. In one embodiment, a fluid dilution system includes a supply reservoir including a concentrated fluid, a diluent source including a diluent, and a diluted fluid reservoir operably coupled to the supply reservoir and the diluent source. A fluid level sensor is operably coupled to the diluted fluid reservoir, a pump is operably coupled between the supply reservoir and the diluted fluid reservoir, and a controller is configured to engage the pump based upon signals from the fluid level sensor to pump desired amounts of the concentrated fluid for providing a diluted fluid in the diluted fluid reservoir.

Abstract: In one embodiment, an in-process mass spectrometry (IPMS) system is provided that includes: a plurality of sample mix modules, each sample mix module operable to select an extracted sample from a corresponding plurality of sample extraction modules, wherein each sample extraction module is operable to extract sample from a corresponding process solution bath having at least one analyte, each sample mix module being further operable to mix the selected extracted sample with a spike solution to form a mixture; a mass spectrometer operable to process the mixture from each sample mix module to form a mass spectral response having a spike response and an analyte response; and at least one processor operable to control the pluralities of sample extraction modules, the pluralities of sample mix modules, and the mass spectrometer such that the sample extraction modules automatically extract samples, the plurality of sample mix modules automatically mix the selected extracted samples with spike solution, and the mass