How often do platinum probes need to be replatinized?
Some platinum electrodes are coated with platinum black before calibration. This coating is extremely important to cell operation, especially in solutions of high conductivity. Electrodes are platinized to avoid errors due to polarization. Polarization is a condition in which conductivity plates are screened by ions in the solution, leading to inaccurate readings. Cells should be inspected periodically and after each cleaning. If the platinum black coating appears to be wearing or flaking off the electrode, the cell should be replatinized. It is recommended to replatinize the electrode approximately every six months.
