Chromatographic system

Details Chromatographic system Chromatographic system

1990-05-15

1992-01-14

Therkorn, Ernest G.

Liquid purification or separation

With means to add treating material

Chromatography

210101, 210137, 210143, 366152, 366160, 366162, B01D 1508

Patent

active

050807854

ABSTRACT:
To prevent the solvents forming a gradient from mixing at the wrong place and to provide for accurate composition at start of the gradient in spite of solvent pressure variations, a microliquid or supercritical fluid chromatograph includes a combined mixer and pressure detector in which equal pressures of the two solvents in the gradient are detected by displacement of a ferromagnetic poppet in the mixing chamber. The poppet serves as a stop for the final solvent until the pressures are substantially equal and then its movement is detected by a circuit related to a linear variable differential transformer. The signal energizes a circuit which drives one of the sensing coils to drive the poppet during the gradient to provide mixing.

REFERENCES:
patent: 3934456 (1976-01-01), Munk
patent: 4043906 (1977-08-01), Helmer
patent: 4437812 (1984-03-01), Abu-Shumays et al.
patent: 4752385 (1988-06-01), Wilson

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