Abstract: A method for calibrating an amperometric sensor at a stationary measuring point, comprises the following steps: providing a mobile calibration device comprising a stabilized calibration fluid at the stationary measuring point; activating the stabilized calibration fluid and providing an activated calibration fluid; calibrating the amperometric sensor by means of the activated calibration fluid; and a mobile calibration device.

Abstract: The present disclosure discloses a method for calibrating a photometric analyzer which is designed to determine the silicate content of an analyte, comprising the steps of: detecting a first measurement point, with the steps of adding a first reagent to a sample of a first calibration standard, adding a second reagent to this sample, adding a third reagent to this sample; detecting a second measurement point, wherein the second measurement point differs from the first measurement point, with the steps of adding the second reagent to a sample of a second calibration standard, adding the first reagent to this sample, adding a third reagent to this sample; determining the zero point and the slope of the calibration line using the first and second measurement points.