What working life can I expect from a pH electrode

The working life of a pH electrode is heavily dependant on the application, and how it is maintained. A well-maintained pH electrode will function for 6 to 24 months in most typical applications. However, the life span of an electrode will be greatly reduced by exposure to high temperatures, high process pressure, or by exposure to aggressive media (such as HF or very caustic applications) which can result in damage to the membrane or reference system. As the membrane on a pH electrode ages the speed of response reduces decreases until it becomes unacceptably slow.