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TUBES
Use turbidity tubes (0260) that are free of scratches and imperfections in the light zone
between the bottom of the tube and the fill line. Discard scratched tubes. When reading very
low turbidity samples, do not use tubes or caps that have been used previously with high
turbidity samples. See page 57 for additional information.
TURBIDITY CALIBRATION PROCEDURE
The default calibration curve is nephelometric as indicated by (N) in the Menu bar. The
default units are NTU (2020t BLE) and FNU (2020i BLE). Other calibration curve options are
ratiometric and attenuation. The ratiometric calibration curve is indicated by (R) and the
attenuation calibration curve is indicated by (A). A user calibration should be performed for
each mode with standards that are appropriate for the meter and range.
For the most accurate results, a user calibration should be performed over the smallest
range possible. Use a calibration standard that, along with the blank, brackets the range
of the samples that will be tested. For example, if the samples that are to be tested are
expected to be below 1 NTU, more accurate results will be obtained by calibration with a
blank and a 1 NTU standard as opposed to a blank and a 10 NTU standard.
The number of measuring ranges for each mode varies.
The 2020t/i BLE should only be used with Code 0260 tubes. Using other tubes will result in
less accurate readings.
Mode
Nephelometric (N)
Ranges
0-11 NTU/FNU
10-110 NTU/FNU
Each range can be calibrated with one point per range plus a blank. New calibration points
will replace old calibration points independently for each range. If one range is recalibrated,
the meter will retain the existing calibration data for the other ranges. It is recommended
that the meter be calibrated for each range that will be used. The value of the standards
chosen for the calibration should not be at the extremes of the ranges. The meter is auto-
ranging and will automatically select the appropriate range for the sample being tested.
It is recommended that the meter be calibrated daily.
A 2020t BLE in the nephelometric mode with NTU standards will be used in the following
examples.
1.
Press and briefly hold
the meter on. The LaMotte logo screen
will appear for about 3 seconds and
the Main Menu will appear.
2.
Press
ENTER
Ratiometric (R)
0-11 NTRU/FNRU
10-110 NTRU/FNRU
100-510 NTRU/FNRU
500-1000 NTRU/FNRU
to turn
to select Measure Menu.
Main Menu
Measure Menu
Setup Menu
12:00:00 p
Measure Menu (N)
Turbidity - No Blank
Turbidity - With Blank
12:00:00 p
30
Attenuation (A)
0-1010 AU/FAU
1000-2000 AU/FAU
1/500
1/500
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