Application Note: Calibration Methods for Low-Level Turbidimeter Measurement
The process of calibrating and subsequently verifying the calibration of turbidimeters for low-level measurement is very sensitive to user technique and the surrounding environment. As measured turbidity levels drop below 1.0 NTU, interferences caused by bubbles, particulate contamination, and stray light become major factors. To minimize these errors, many approaches can be taken. Two of the most common approaches for low-level calibration are one-point and two-point calibrations.
Download this application note for measuring low level turbidity. This explains how to calibrate and measure on low-level (<1.0 NTU) samples. It discusses possible sources of error and the resulting calibration approach that Hach takes for its turbidimeters.