![]() Most sensors nowadays have Automatic Temperature Compensation (ATC). If the solution is rapidly changing temperature because it was just taken out of the fridge, then there is going to be some drift as hydrogen ions change activity level. A good example of this is pure water, which has a low buffering capacity that results in drift as CO 2 from the atmosphere enters and acidifies the water. Unless you are measuring a buffer, there is always going to be some amount of instability seen due to reactions in the solution itself or between the solution and its’ environment. There are many forums online where people ask why their pH meter or sensor reading isn’t stable, only to find out that the solution they are measuring is the culprit. This guide will provide steps to simplify the troubleshooting process and determine what the cause of drift is along with how to fix it.įirst off, how do we determine what part of the system is drifting? The first step is knowing the physical properties of your solution. ![]() ![]() Is it the solution, sensor, or electrode that is drifting? Is the electrode too old? Did something happen during shipment? Is there electrical interference with the sensor? PH drift is one of the most frustrating issues to troubleshoot because it can seem random and be caused by many different aspects of the environment, maintenance, and sensor design.
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