When it comes to calibration, it is an indispensable part of many instruments. Just like a piano needs tuning! There is a great relationship between the calibration and measurement data of the testing equipment, and it will be greatly disturbed in the use of the water quality online monitoring instrument, and if it is not solved in time, it will affect the service life of the equipment. So, calibrating the water quality monitor is not without reason!
The reason for calibrating the water quality on-line monitor is simply that we adjust the instrument that has errors. In fact, errors in instrument response over time are inevitable. (For example: small physical changes in the glass surface on a pH sensor will alter the response and lead to inaccurate pH readings. Calibration can counteract these changes in water quality testing equipment. So effective calibration is crucial to getting accurate data.) Of course, to accurately include the expected results, you must have some prior knowledge about water quality. If the range of values tested for water quality is large throughout the sampling period, the calibration criteria should be adjusted accordingly.
In addition, when using a single calibration standard to calibrate water quality monitoring equipment, it is necessary to use a standard value close to the water quality standard. The further the distance from the standard value, the less accurate the data provided by the instrument. The factors that determine the inaccuracy of the results are called linear features. It generally refers to the change in the response of the instrument as the concentration changes.
But not all water quality monitoring devices and analytes behave linearly, and not all instruments are linear across all ranges. Usually linearity is slightly different, and these are important factors in determining effective calibration. If the instrument does not exhibit linear behavior over a range, the choice of two calibration criteria that closely surround the expected values will usually offset the inaccuracies resulting from nonlinearities.
In summary, the concentration and number of points used to calibrate the device will have an impact on the results of your water quality monitor. Therefore, users should pay attention to calibration in daily use.
