A result is only as good as the process that produced it. At the Fundamentals level you learned what turbidity, pH, chlorine residual, and alkalinity measure - here, you learn how to make sure the number on the screen can actually be trusted, when and where to draw samples so they mean something, and how to turn a routine reading into a process control decision instead of just a logbook entry.
Calibration Procedures
Calibration is the process of adjusting an instrument's response against materials of known, traceable value so its readings match reality. A rushed or skipped calibration is one of the most common causes of quietly wrong data - the instrument still produces a number, and that number still looks reasonable, which is exactly what makes it dangerous.
- pH meters are calibrated using buffer solutions of known pH, typically bracketing the expected sample range (commonly