Note:
After selecting the measurement range and in the event of excess when the S200 Open
device returns to Measurement Mode, the measurement will remain frozen on the screen.
In this case, and if the measurement remains frozen, return to the measurement range
selection menu to choose a wider range.
7.2.5 Method for calibrating nephelometric turbidity
As noted above, the nephelometric turbidity sensor has 4 measurement ranges, with separate
calibration coefficients, all calibrated using the menu: CALIBRATION. The calibration sequence
for the 0-200 NTU range is described below.
Note:
The turbidity probe must be checked periodically (depending on the proportion of
impurities present). It is important to rinse the probe before each check. Organic deposits
on the probe, such as mud or biofilm, may result in measurement errors. These deposits
can be carefully removed using hot soapy water and a soft sponge. Never use an abrasive
cleaner. Limestone deposits can be removed using a dilute hydrochloric acid solution
(max . 5%).
7.2.5.1 Calibration of zero point – detailed procedure
Operating conditions:
The sensor is placed in distilled water for this calibration step. The total absence of bubbles on
the active part of the sensor (optical part) will be checked.
Select CALIBRATION in the general menu:
Use the right arrow, on the first accessible line, to activate the calibration sequence.
Pressing the right and left arrows simultaneously will start the measurement sequence.
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