Method for calibrating gas measuring sensors for dissolved gasses and method for measuring the concentration of CO.sub.2 in blood with the assistance of such a calibration method two or more separate calibration fluids in which a gas to be measured is dissolved with respectively different...http://www.google.de/patents/US5763760?utm_source=gb-gplus-sharePatent US5763760 - Method for calibration of gas measuring sensors for dissolved gasses and method for measuring the concentration of CO.sub.2 in blood with the assistance of such a calibration method 
