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On October 1, 2000, the NWQL will begin analyzing samples for turbidity using a Hach 2100AN Nephelometer. The new nephelometer will replace the current Hach instrument on June 1, 2001. The Hach 2100AN uses improved technology to determine turbidity. It is more efficient and produces more accurate results in the presence of color than the present instrument. Color from dissolved substances in water that absorb light, causes measured turbidities to be biased low. Data produced by the new instrument may be different from previous data produced on the Hach 2100A. These differences are site and matrix specific. Both lab codes may be requested at no additional charge until June 1, 2001, because of the possible effect to the data base.
Public Domain.
The following documentation compares the Hach 2100A and Hach 2100AN instruments for the measurement of turbidity in water. Both instruments were checked against primary formazin standards and purchased reference samples and produced equivalent accurate results.
The following documentation compares the Hach 2100A and Hach 2100AN instruments for the measurement of turbidity in water. Both instruments were checked against primary formazin standards and purchased reference samples and produced equivalent accurate results.
The following documentation compares the Hach 2100A and Hach 2100AN instruments for the measurement of turbidity in water. Both instruments were checked against primary formazin standards and purchased reference samples and produced equivalent accurate results.
The following documentation compares the Hach 2100A and Hach 2100AN instruments for the measurement of turbidity in water. Both instruments were checked against primary formazin standards and purchased reference samples and produced equivalent accurate results.