Method and apparatus for degassing a liquid and analytical device having the apparatus

摘要

A method for degassing a liquid by means of a piston pump unit having a receiving chamber serving for accommodating the liquid to be degassed and connected with at least one supply line and at least one drain line, and a piston seated in the receiving chamber for performing stroke movements. The piston provides a liquid sealing of the receiving chamber on one end. The following steps are included: drawing liquid via the supply line into the receiving chamber by performing a first stroke movement of the piston in the case of blocked drain line and open supply line; producing a negative pressure in the receiving chamber by continuing the first stroke movement of the piston in the case of blocked supply line and blocked drain line; and opening the drain line and removing a gas phase present in the receiving chamber from the receiving chamber via the drain line by performing a second stroke movement of the piston directed counter to the first stroke movement in the case of an opened drain line and blocked supply line.

主权项

1. An apparatus for performing a method for degassing a liquid comprising:
a piston pump unit comprising a receiving chamber serving for accommodating a liquid to be degassed; a piston movable in said receiving chamber and sealing said receiving chamber on one end; a liquid supply comprising the liquid to be degassed; at least one supply line connecting said receiving chamber with said liquid supply; at least a first drain, line connected with said receiving chamber; a valve unit, by means of which said at least one supply line and said first drain line are selectively blockable, at least at times; and a control unit configured to control the apparatus for performing the method for degassing a liquid comprising the steps:
controlling the valve unit to block said first drain line and to connect said liquid supply via the at least one supply line with the receiving chamber and controlling the piston to perform a first stroke movement of the piston and to draw the liquid from said liquid supply via said at least one supply line into the receiving chamber;controlling the valve unit to block both said first drain line and said at least one supply line and controlling the piston to continue the first stroke movement in such a way, that a negative pressure is produced in the receiving chamber;controlling the valve unit to open said first drain line and to block said at least one supply line and controlling the piston to perform a second stroke movement in direction opposed to the first stroke movement and to remove a gas phase present in the receiving chamber from said receiving chamber via said first drain line.