A square symbol □ flashes on and off during the calibration sequence.
When the first calibration stage has been completed, remove the distilled water sensor and wipe
it.
7.2.5.2 Calibration of the second point - detailed procedure
Operating conditions:
The second point is calibrated in an aqueous suspension of formazine with constant
stirring.
To calibrate the turbidity sensor, use a reference solution in the median area of the given
measuring range, such as a 100 NTU reference solution for the 0-200 NTU range.
Use the DOWN arrow key to select the second CALIBR. 0.0 NTU line.
Use the UP arrow to adjust the digital display to the value of the aqueous formazine suspension
used, for example, 100.0 NTU.
Once the suspension is perfectly uniform, pressing the right and left arrows simultaneously will
start the measurement sequence.
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