Calibration of density and temperature according to ISO 17025

All measuring devices should be regularly checked using a certified reference material. This is of special importance in a regulated environment like the pharmaceutical industry or in laboratories that work according to ISO 17025. For a density meter the density and the temperature should be controlled. This is done using a density standard and a certified thermometer. Reference liquids have to be very stable and of high purity and should be comparable to the real samples when it comes to their chemical and physical properties. A commonly used liquid is ultra-pure water with a density of 0.998 g/cm³, others are oil-based and have higher viscosities for instance. To check the linearity of results in a wide density range, standards come with densities between 0.7 and 1.5 g/cm³. Read the full text to learn about calibrations and adjustments of density meters according to ISO 17025. Trust is good, traceability is better!