7
Measurement and Calibration
Measurement and Calibration Hints
•
Ensure that the sample in vial is homogeneous and preventing air bubbles.
•
Before starting the measurement, the outside of vial must be clean and dry. Wipe the vial with a lint-free cloth to remove fingerprints and
waterdrops.
•
If the vial has minor scratches or scuffs, add a few drops of silicone oil to outside of the vial. Wipe with lint-free cloth.
•
Ensure that the vial is positioned in the measurement chamber, the mark on the vial must be aligned with the arrow on the meter.
•
To prevent the errors from ambient light interference, do not use the meter in direct sunlight. Always close the light shield lid during the
.
measurement and calibration.
•
The vial and cap must be cleaned thoroughly with deionised water after each measurement. Any residues can cause inaccurate readings.
Turbidity Calibration
•
The TB200 turbidity meter is calibrated with Formazin Standards at the factory and does not require user calibration prior to use.
•
Do not shake or agitate the calibration standard violently to prevent air bubbles.
•
In order to get accurate measuring results, we recommend calibrating the meter at least once a month.
•
The meter allows turbidity calibration up to 7 points with minimum of 2 points, the default calibration points include the 0.02, 10.00, 200,
500, 1000, 1500 and 2000 NTU. For better accuracy, ensure that selecting a calibration point close to the sample value you are measuring.
Calibrating the meter
1.
Press the
Cal
key to enter the calibration mode, the meter prompts you
to select the “Number of Calibration Points”.
2.
Press the
◄
/
►
key to select an applicable option (2 to 7 points). Press the
Enter
key, the screen shows first calibration point
“
0.02 NTU
”
.
If necessary, press the
◄
/
►
key to select a calibration point close to the sample value you are measuring.
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