5. Press the Enter key, the meter begins calibration. The Calibrating
icon shows on the upper right corner of the screen.
When the reading stabilizes, the meter will automatically show
next calibration point.
If necessary, press the key to select a desired calibration point.
6. Repeat steps 3 through 5 until the screen shows "Calibration is
Completed", the meter returns to the measurement mode.
To exit the calibration without saving calibrated values, press the ESC
key.
Turbidity Measurement
An accurate turbidity measurement depends on good measurement
techniques. Factors such as clean sample vial, positioning of vial in
the measurement chamber, covering the vial with the light shield lid,
meter calibration, removal of bubbles, etc. Refer to the Measurement
and Calibration Hints section for detailed instructions on page 3.
Measuring the Low Turbidity Sample
For the low turbidity samples (< 200 NTU), we recommend that using
the same vial to perform the calibration and measurement.
1.1 Rinse the vial with approximately 10 ml of sample. Cap and upend
the vial several times. Discard the used sample and repeat the
rinsing procedure two more times.
1.2 Fill the vial with the sample. Cap the vial and wipe with a lint-
free cloth to remove waterdrops and fingerprints. Hold the vial
cap and gently inverting vial several times, ensure that the sample
is homogeneous and no air bubbles.
1.3 Insert the vial into the measurement chamber. Align the triangle
mark on the vial with the arrow on the meter. Close the light
shield lid.
1.4 Press the Meas key, the meter begins measurement, the
icon shows on the screen. When the reading stabilizes, the icon
will automatically switch to .
1.5 If necessary, press the Meas key to take a new measurement.
During the measurement, press the
key, the reading will be locked.
Press the key again to resume measurement.
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