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Calibration of the probe
The S461TN probe can be calibrated can be calibrated in several ways:
• On two points:
You trace the calibration line by using two known solutions: the first point
near 0 NTU and the second to a value as close as possible to the working
point.
• First point:
It calibrates the first point of the curve. You enter the calibration menu with
two points, but you only perform a calibration of the first. In this way it is
possible to align the reading when the read value is lower than 1 NTU, but
discordant to a known reference.
• Second point:
It calibrates the second point of the curve. You enter the calibration menu
with two points, but you only perform a calibration of the second. In this
way it is possible to align the reading when the read value is higher than 1
NTU, but discordant to a known reference.
• Single point:
This calibration mode allows to change the offset of all the straight and
must be performed only when the turbidity value of the point that we are
calibrating is above 1 NTU, because the probe does not allow to change
the offset if the values of turbidity are too low.
Circulate water with known solution, making sure that there are no air bubbles
in the circuit: to eliminate them you can create a small pressure partially
closing the output stream.
The liquid can also stay calm inside the probe holder, but you must be careful
to deposit phenomena that could distort the reading.
Wait about 4-5 minutes for the reading to stabilize and proceed with
calibration from the keyboard by entering the value of the known solution.
S461TN Infrared Turbidity Probe – Data Sheet
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