TURBIDITY OPTIONS
Three calibration curves are available: Nephelometric, Ratiometric and Attenuation. For
the 2020t, Nephelometric is the default calibration curve and the available units are NTU,
NTRU, ASBC and EBC. For the 2020i, Nephelometric is the default calibration curve and the
available units are FNU, NTU, FNRU, ASBC and EBC for the 2020i.
The 2020t in Nephelometric mode with the default NTU units should be used for testing
public drinking water for compliance with the EPA 180.1 rule.
Once a calibration curve and turbidity units have been selected, they will remain selected
until the calibration curve and turbidity units are changed by performing the following
procedures.
SELECTING A TURBIDITY CALIBRATION CURVE
Three calibration curves are available: Nephelometric, Ratiometric and Attenuation. The
default calibration curve is Nephelometric. The calibration curve should be chosen that
suits the type of sample being tested.
Nephelometric
Mode:
Ratiometric
Mode:
Attenuation
Mode:
Ratiometric methods typically minimize color interference.
The 2020t in Nephelometric mode with the default NTU units should be used for testing
public drinking water for compliance with the EPA 180.1 rule.
The Nephelometric mode will be used in the example. To change the calibration curve:
1.
Press and briefl y hold
turn the meter on. The LaMotte
logo screen will appear for about
3 seconds and the Main Menu will
appear.
2.
Press
90° Detector
90° and 180°
Detectors
180° Detector
to
to scroll to Options.
0 – 100 NTU/FNU Range, for Drinking Water
Samples
0 – 1000 NTU/NTRU/FNRU Range, for
Drinking Water, Natural Water
Samples, Storm Water Samples, and Colored
Samples
0 – 2000 NTU/AU/FAU Range, for High
Turbidity Samples
Measure
Data Logging
Options
12:00:00
Measure
Data Logging
Options
12:00:00
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