As floating and moving particles are measured in turbidity, slight measurement deviations are possible. In order to achieve results that are as representative as possible, attention should be paid to the following:
samples should be measured immediately, as particles otherwise settle.
constant lamp operating temperature.
condensation on samples should be avoided.
the position of the standards should be marked to exclude the influence of glass inhomogenities.
High precision standards:
The supplied polymere standards (AMCO Clear®) are retraceable to formazine standards and rated to be a primary standard according to US EPA. Due to production accuracy, and stability in solution the calibration and the resulting measured values are more precise.