What is calibration in turbidity meter?
What is calibration in turbidity meter? A turbidity standard is a liquid sample or other material with a defined and reproducible turbidity value. There are two types of turbidity calibration standards: 1. Primary standards are used to calibrate a meter directly, or to calibrate a secondary standard. Primary standards are the “gold standard” for turbidity. How frequently turbidity meter should be calibrated? Calibration at least every 90 days and verification at least once per week are required by rule. To be considered an acceptable verification, turbidity measurements greater than 0.5 NTU must be within +/- 10% of the reading assigned...