Maintenance may become necessary for a defective membrane head, wrong readings, or a failed calibration.

This procedure includes cleaning or replacing the membrane head, exchanging the electrolyte solution, and cleaning the electrode system.

The maintenance interval depends on the given measurement conditions, especially the degree of contamination and the concentration of certain substances.

• 3x membrane heads
• 6x ampoules of electrolyte solution
• sandpaper and accessories
• handy assortment box