Integrated Multi-parameter Sensor Operation manual
46
Important note: The rhodamine B stain solution of 0.03mg/L corresponds to 2000/ml. The rhodamine
B stain solution of 0.3mg/L corresponds to 20,000 blue/green.
6.1.9 Ion Sensors Calibration
Calibration instructions
：
1)
For the sensors of ammonia nitrogen, nitrate ion, fluoride ion, and chloride ion, when the standard
solution difference is 10 times( such as 1mg/L and 10 mg/L
，
and 10 mg/L and 100 mg/L, etc..), the
voltage difference measured by the new electrode should be in the range of
57 + 3 mV
. The voltage
difference will reduce as the utility time increases, and the electrolyte or membrane head should be
replaced according to the maintenance cycle.
2)
Because the concentration below 1 mg/L of chloride ion electrode cannot measured, 1 mg/L and
10mg/L of the chloride ion sensor is special for their pressure difference will be between 35mV and
45mV. Therefore, the calibration point should select proper range.
3)
Since the concentration pressure difference of potassium ion below 5mg/L is small, it should be larger
than 3mg/L and then judge whether the standard pressure difference is in line with the 10-fold relation.
6.1.9.1 Ammonia Nitrogen Sensor Calibration
See section 6.1.9 for instructions before calibration.
Take an option from the calibration menu to enter
the "electrode" calibration program, and the interface is showed by diagram as below. Then, the operation
of calibration can be prepared to start. Types of ion electrodes should be pre-configured, such as that
showed in the square frame.
The Ammonia Nitrogen sensor is calibrated with Ammonia Nitrogen standard solution for
three to five
point calibration. The factory requires 4-point calibration. The customer can base on the situation on the
site to calibrate with
three to five
point calibration method. The calibration points and current calibration
points can be selected in the calibration box.
1.
Generally, three-point calibration can be selected when measuring water below 50mg/L:
0.02mg/L
、
1mg/L and 10mg/L
2.
Generally, the following calibration methods can be selected when measuring water over 50mg/L:
1
）
Three-point Calibration
:
0.02mg/L
、
1mg/L or 10mg/L (or 25mg/L or 100mg/L)