Traditional particle counter cannot distinguish between dust and bacteria. The determination of bacterial contamination via therefore still counting of particles between 0,5 and 5 microns, the usual size of bacteria, in combination with the test by creating cultures. To make sure that a product is not Bacterially contaminated, it must be taken therefore up to three days after the production at the plant back so long just until the evaluation of crops on the nutrient fluids is completed. Instruments of the new generation to integrate a measurement by UV light. So, you use the fluorescent properties of living materials. To measure particles captured this classic with both number and size as well as with their fluorescence signal.
These innovative developments are a positive step in the direction of realtime measurement. However, they have some weaknesses. So, the UV measurements are still quite slow, so that typically only a fraction of the air drawn-in can be checked by UV light. Included the normal measurement uncertainty, often still no representative result can occur in this way. In highly sensitive areas such as the pharmaceutical industry and medical technology you can – don’t forgo so continued to the test by creating cultures and the consequent loss of time but this is of course the goal.
In metrology, we are already working on new calibration systems, and applicable standards for this Area. What was the impetus for the formation of the modern metrology? And what is it today? Metrology is actually a very old science, as measured and counted has always been: If the width of the field or the size of a herd of sheep. The units it counted were very different over the course of time. So mostly the body served until in the 18th century as a basis for measures such as Elle, foot or step. The problem was that these units were associated with mostly a living person.