Instruction Manual TN-100/ T-100
5
2. Turbidity Calibration
The TN-100/ T-100 turbidimeter was calibrated and tested prior to leaving the
factory. Therefore, it is possible to use the instrument directly out of the box.
However, re-calibration of the instrument is recommended to help you become
familiar with the operation of the instrument and the calibration procedures. In
addition, re-calibration is recommended at least once every month for optimum
accuracy.
It is recommended that you perform a full calibration using all 4 standards provided
to ensure full-range accuracy. However, the TN-100/ T-100 turbidimeter provides
flexibility for you to calibrate at selected ranges suitable for your application.
In addition, the instrument comes with a light shield cap to shield off stray light
during calibration and measurements.
2.1 Calibration Standards
We recommend that you use the following materials during calibration to achieve
the accuracy stated in this manual:
CAL 1: 800 NTU Calibration Standard
CAL 2: 100 NTU Calibration Standard
CAL 3: 20.0 NTU Calibration Standard
CAL 4: 0.02 NTU Calibration Standard
It is well known that diluted Formazin is unstable. If you choose to use Formazin to
calibrate the instrument, ensure that you are using a fresh stock suspension of
Formazin to achieve the accuracy quoted for the instrument. Calibration standards
offered are more stable than Formazin and have a limited shelf life of 12 months. If
you use the supplied calibration standards to calibrate the instrument, review the
expiration date (indicated on cap label) to ensure that the standards have not
expired.
It is important that the calibration standards are not violently shaken or agitated
because air entrapment in the fluid introduces an error factor during calibration
which subsequently will lead to an inaccurate measurement. Also, do not store in
freezing temperatures which causes irreversible shrinkage of the standards’
particles thus resulting to inaccurate calibration and measurement.
2.2 Indexing
Due to the high quality of the glass vials provided, indexing is not required. You only
need to align the mark on the vial with the mark on the meter. However, in order to
achieve a better accuracy of the measurement, you can proceed with indexing of
the vials. See Section 8.5 - Indexing a Vial on page 20 for more information.
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