disposable , pre - sterilized , and pre - calibrated , pre - validated conductivity sensors are provided . these sensors are designed to store sensor - specific information , such as calibration and production information , in a non - volatile memory chip on the sensor on in a barcode printed on the sensor the sensors are calibrated using 0100 molar potassium chloride solutions at 25 degrees celsius . these sensors may be utilize with in - line systems , closed fluid circuits , bioprocessing systems , or systems which require an aseptic environment while avoiding or reducing cleaning procedures and quality assurance variances .