Conductivity standards usually consist of potassium chloride dissolved in reagent-grade water. Discard standards that have expired, been frozen, have begun to evaporate, or that were decanted from the storage container. Maintenance Maintenance of conductivity equipment includes periodic office checks of instrument operation. Keep all cable connectors dry and free of dirt and extraneous matter. Protect connector ends in a clean plastic bag when not in use.
Sensors can soak in detergent solution for many hours without damage.
If oil or other residues persist, dip the sensor in a dilute hydrochloric acid solution. Never leave the sensor in contact with acid solution for more than a few minutes. Check the manufacturer's recommendations before using acid solution on sensors. Clean carbon and stainless steel sensors with a soft brush. Never use a brush on platinum-coated sensors.