Why doesn't the 2100Q use the same less than 0.1 NTU standard that the 2100P used?

Document ID

Document ID TE562

Published Date

Published Date 04/17/2020
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Question
Why doesn't the 2100Q use the same less than 0.1 NTU standard that the 2100P used?
Summary
2100Q calibration does not include <0.1 NTU standard
Answer
The <0.1 NTU is used primarly in calibrations where the standards are prepared by dilution from a stock Formazin standard. The <0.1 NTU standard is used to account for the turbidity of the dilution water used to prepare the other standards. This was the way turbidimeters were calibrated when the 2100P was first launched. Since the 2100Q is calibrated with pre-prepared sealed vials, the <0.1 NTU would not be necessary. This was eliminated because it introduced the possibility for error during calibration if the standard was inverted or shaken. Since the calibration curve is linear, the results will be the same using the vials that come with the 2100Q. 

The Stablcal® Turbidity Standards Calibration Kit, 2100P Portable Turbidimeter, Sealed Vials (Product # 2659405) is available, and it includes the <0.1 NTU sealed vial.

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