Measuring device and method for measuring gas load in liquids, especially in liquid plastic materials

A measuring apparatus for measuring gas loading of a liquid plastics component in a system, comprising a piston pump which is disposed in a circuit for a sample quantity obtained from said system and a piston of said piston pump of which can be adjusted, with displacement control and by means of an actuating drive, in both directions of travel in a measuring cylinder chamber;

• a switchable valve device forming a filling and ejection valve to fill said measuring cylinder chamber with said sample quantity to be measured and for carrying away said sample quantity from said measuring cylinder chamber after a measuring operation has been performed;
• and a pressure measuring device which is associated with said measuring cylinder chamber and with which a pressure of said sample quantity, which is isolated in said measuring cylinder chamber when said switchable valve device is closed, can be measured at different predetermined positions of displacement of said piston in order to determine said gas loading, an actuating drive of said piston pump including a servomotor having a transmission gear and said piston pump also a feed pump which returns said sample quantity from said measuring cylinder chamber to said system after said measuring operation has been performed, said transmission gear includes a spindle gear, said piston, and a spindle nut attached thereto and secured against rotation.

A measuring apparatus for measuring gas loading of a liquid plastics component in a system, comprising a piston pump which is disposed in a circuit for a sample quantity obtained from said system and a piston of said piston pump of which can be adjusted, with displacement control and by means of an actuating drive, in both directions of travel in a measuring cylinder chamber;

• a switchable valve device forming a filling and ejection valve to fill said measuring cylinder chamber with said sample quantity to be measured and for carrying away said sample quantity from said measuring cylinder chamber after a measuring operation has been performed;
• and a pressure measuring device which is associated with said measuring cylinder chamber and with which a pressure of said sample quantity, which is isolated in said measuring cylinder chamber when said switchable valve device is closed, can be measured at different predetermined positions of displacement of said piston in order to determine said gas loading, an actuating drive of said piston pump including a servomotor having a transmission gear and said piston pump also a feed pump which returns said sample quantity from said measuring cylinder chamber to said system after said measuring operation has been performed, said piston pump includes a cylinder body which comprises said measuring cylinder chamber and which is attached, via a housing body which receives said transmission gear, to a connection body for the attachment of said servomotor.

A measuring apparatus for measuring gas loading of a liquid component in a chemical reaction system comprising a measuring chamber that can be isolated from said chemical reaction system;

• at least one valve to allow a sample liquid from said system to be introduced into and be expelled from said measuring chamber and to isolate said sample liquid in said measuring chamber from said system;
• a piston pump including a piston that is displaceable in said measuring chamber to controllably reduce and increase the volume of said measuring chamber;
• a measuring device associated with said measuring chamber to measure at least one physical parameter when said sample liquid is in said measuring chamber and isolated from said system;
• and a gas separation accelerator;
• at least one of said physical parameters including a parameter selected from the group consisting of volume of said measuring chamber, volume of said sample liquid in said measuring chamber, temperature in said measuring chamber, piston position in said measuring chamber, and combinations thereof;
• said piston pump being a loading pump to load said sample liquid in said measuring chamber and an expelling pump to expel said sample liquid from said measuring chamber after measuring said gas loading of said sample liquid.

A measuring apparatus for measuring gas loading of a liquid component in a chemical reaction system comprising a measuring chamber that can be isolated from said chemical reaction system;

• at least one valve to allow a sample liquid from said system to be introduced into and be expelled from said measuring chamber and to isolate said sample liquid in said measuring chamber from said system;
• a piston pump including a piston that is displaceable in said measuring chamber to controllably reduce and increase the volume of said measuring chamber;
• a measuring device associated with said measuring chamber to measure at least one physical parameter when said sample liquid is in said measuring chamber and isolated from said system;
• and a gas separation accelerator;
• at least one of said physical parameters including a parameter selected from the group consisting of volume of said measuring chamber, volume of said sample liquid in said measuring chamber, temperature in said measuring chamber, piston position in said measuring chamber, and combinations thereof;
• said piston pump being a loading pump to load said sample liquid in said measuring chamber and an expelling pump to expel said sample liquid from said measuring chamber after measuring said gas loading of said sample liquid, said piston pump causing said sample liquid to load into said measuring chamber by controllably retracting said piston to cause an increase of volume in said measuring chamber, said piston pump causing said sample liquid to be expelled from said measuring chamber by controllably advancing said piston to cause a decrease of volume in said measuring chamber, said piston pump controllably moving said piston in said measuring chamber while said sample liquid is in said measuring chamber and isolated from said system to cause at least one of said physical parameters to change in order to determine said gas loading of said sample liquid.