Comparison Of Ultra Low Range Total Chlorine Residual Limits Of Detection And Quantitation Across The Water Industry

Limits of Detection and Quantitation are key to understanding analytical instrumentation capabilities, especially when non-optimal process control can lead to damage of sensitive equipment due to insufficiently accurate readings. Notice how the Hach Ultra Low Range CL17sc Total Chlorine Analyzer, the Hach CL17sc, and the Hach CLT10sc compare in accuracy with competitor analyzers.

To count the number of credible measurements of a chlorine analyzer, we sum the number of measurements below the limit of detection (LOD, indicating the absence of chlorine) and the number of measurements above the limit of quantitation (LOQ). Above the LOQ, the reading of chlorine is accurate as specified in the user manual.

The ULR CL17sc has LOD of 8 µg/L (ppb) and accuracy of ±5% or 10 ppb, whichever is greater. The CL17sc has LOD of 30 µg/L (ppb), and accuracy of ±5% or 40 µg/L (ppb), whichever is greater.