Radiometer Medical A/s

Michael Taagaard

Flemming Aas

Allan Larsen

A method for detection of a bubble in a liquid which is placed in a measuring chamber and is in contact with a sensor for measuring the partial pressure of a particular gas in a liquid is provided. The method includes performing a first measurement of the partial pressure of the particular gas in the liquid at a first pressure in the measuring chamber. Next, the pressure in the measuring chamber is changed to a second pressure. A second measurement of the partial pressure of the gas in the liquid at the second pressure in the measuring chamber is performed. An expected result of the second measurement based on the first measurement and assuming that no bubbles are present in the measuring chamber during any of the measurements is provided. The actual result of the second measurement is compared with the expected result and a conclusion is drawn on the presence of a gas bubble in the liquid based on the comparison. An apparatus for measuring the content of a particular gas in a liquid is also provided.

Method and apparatus for detection of a bubble in a liquid

The reference electrode comprises an electrode plug and a chamber ( ) closed at the rear containing an electrolyte. The chamber ( ) has an aperture ( ) covered by a membrane ( ) of a material permitting diffusion of ions therethrough, but whose surface is closed for proteins and similar macromolecular substances. A diffusion tight diaphragm element ( ) having a through-going orifice ( ) located radially within the aperture is situated on the outer side of the ion diffusion membrane ( ) relative to the chamber, and the orifice ( ) is smaller than the aperture ( ).

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Hørsholm, Denmark

Michael Taagaard