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20 Calibrating turbidity sensors
20.3 Calibration routines for turbidity sensors
20.3.1 Two-point calibration
NOTE!
Turbidity sensors can be configured with automatic selection of the measuring
range. Accordingly, calibrations must be performed for all "accessible measur-
ing ranges".
NOTE!
You must be logged in with corresponding user rights to perform calibrations.
⇨ Chapter 8.2.1 "Log-on/Log-out", page 89
Step Action
1 Start the two-point calibration.
Device Menu > Calibration > Digital Sensor 1 to 6 >
Two-Point Calibration
2 Enter one of the measuring ranges 1 to 4. Confirm the entry by
pressing "OK"
3 Clean the sensor and immerse it in the distilled water.
4 The device displays the current measured value of the distilled wa-
ter. The user does not need to make any entries here.
5 Wait until the measured value displayed stabilizes and then con-
firm the result of the measurement by pressing "OK"
6 Immerse the sensor in a formazine reference solution. Its turbidity
value should be approximately at the middle of the selected mea-
suring range.
7 The device displays the current measured value of the formazine
reference solution. Enter the actual turbidity value of the reference
solution.
8 Wait until the measured value displayed stabilizes and then con-
firm the result of the measurement by pressing "OK"
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