Turbidity Meters - Table Top

Turbidity is equal to the reduction of the transparency of a liquid due to the presence of particles in suspension. It can be measured by passing a beam of light through the sample. Turbidity is determined by measuring the light that is diffused by the particles in suspension.

The American standard is referred to as the USEPA method and recommends using a visible light source.  The European standard subscribes to the Infrared method which has the advantage of being less sensitive to the colour of the samples.  HANNA Instruments turbidity meters use both methods and are equipped with a 90° angle sensor.

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Turbidity Specification                 HI 83414 & HI 88703 Range Non Ratio Mode 0.00 - 9.99;10.0 - 40.0 NTU; 0.0 - 99.9; 100 - 268 Nephelos 0.00 - 9.80 EBC Ratio Mode 0.00 - 9.99; 10.0 - 99.9; 100 - 40000 NTU 0.0 - 99.9; 100 - 26800 Nephelos 0.00 - 9.99; 10.0 - 99.9; 100 - 980 EBC Resolution Non Ratio Mode 0.01; 0.1 NTU 0.1; 1 Nephelos 0.01 EBC Ratio Mode  0.01; 0.1; 1 NTU 0.1; 1 Nephelos 0.01; 0.1, 1 EBC Accuracy ±2% of reading plus 0.02 NTU (0.15 Nephelos; 0.01 EBC) ±5% of reading above 1000 NTU (6700 Nephelos; 245 EBC) Repeatability ±1% of reading or 0.02 NTU (0.15 Nephelos; 0.01 EBC) whichever is greater Light Detector Silicon Photocell Method Nephelometric method (90°) or Ratio Nephelometric method (90°&180°). Adapation of the USEPA Method 108.1 and Standard Method 2130 B.  Turbidity Standards  <0.1, 15, 100, 750 and 2000 NTU  Calibration  Two, three, four or five-point calibration *NTU = Nephelometric Turbidity Unit