For this reason, only deionized water should be used for water cooling of laser power sensors. In any case, the water must be clear, clean and sediment-free. The size of any particles in the water must not exceed 150 microns and the total number of particles must be less than 1000 ppm. To achieve this kind of water quality, a suitable filter should be installed upstream of the sensor, directly before its connection to the water.
It is highly important to use laser measurement sensors according to their specifications and to avoid any contamination. By using the calculators on the Ophir web site, it is possible to check up front whether the measurement range will be within the specification of the sensor. Additionally, an initial visual check before usage minimizes the risk of irreversible damage and ensures the reliable functioning of the precision measurement device over the years. It also takes full advantage of the high accuracy ISO-17025 calibration standards that have been applied to each sensor or meter over the entire calibration interval.