New conductivity cells for high-purity water with a small shaft diameter – for pharmaceutical requirements

The coaxially constructed cells are mounted in a bend of the high-purity water line, against the direction of the flow. The sample water evenly enters the space between the inner and outer electrode, which means that air bubbles and flow effects do not falsify the measurement result. The sample water leaves through the holes in the shaft and continues on its way to the high-purity water plant. The electrolytic conductivity cells have been designed for application in ultra pure water (cell constant K=0.01; range 0.055 to about 20µS/cm) or for pure water (K=0.1, 0.1 to 500µS/cm). In compliance with pharmaceutical requirements, the cell material used is stainless steel 1.4435 (316L) which has been electrolytically polished. In the pharmaceutical version, the cells can be supplied with the corresponding certificates for surface roughness (better than 0.6 or 0.8µm), proof of the stainless steel quality (3.1 certificate) and cell constant (ASTM certificate). An FDA confirmation can be issued for the insulating material (PEEK) .

According to choice, the electrical connection can be made via attached cable, M12 cap or instrument connector. The available process connections are: clamp, milk cone DN25 and 1/2" threads. The cells can be supplied with integrated Pt100/Pt1000 temperature probes. In the pharmaceutical version, these are Class A temperature probes. The maximum operating pressure is 16 bar, the maximum operating temperature 160°C.