pH/Cond 3320 Ion concentration
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Continuing with
three- to seven-point
calibration
Repeat the steps 12 to 17 in the same way with the third and further standard
solutions as necessary. The new calibration values are displayed after the last
calibration step was completed.
7.2.4 Calibration standards
Use two to seven different standard solutions. The standard solutions have to
be selected in either increasing or decreasing order.
7.2.5 Calibration data
Displays the calibra-
tion data
The calibration record of the last calibration is to be found under the menu item,
<ENTER> / Calibration / Calibration record. To open it, press the <CAL
_ > key
in the measured value display.
Subsequently, you can transmit the displayed calibration data to the interface,
e.g. to a PC, with the <F2>/[USB output] key.
17. Press <ENTER> to continue with three-point calibration.
or
Finish the calibration procedure as a two-point calibration with <M>.
The new calibration values are displayed.
Based on the calibration data, the calibration curve is determined
in sections, according to the Nernst equation modified by Nikolski.
Select the unit of the standard solution and measurement result in
the ISE setup/Unit menu.
Standard solution (Std 1 - 7) Values
Unit [mg/l] 0.010 ... 500.000
Unit [mol/l] 0.100 ... 5.000 µmol/l
10.00 ... 5.000 mmol/l
Unit [mg/kg] 0.010 ... 500.000
Unit [ppm] 0.010 ... 500.000
Unit [%] 0.001 ... 50.000
The measurement precision is also dependent on the selected
standard solutions. Therefore, the selected standard solutions
should cover the value range expected of the following concentra-
tion measurement.
If the measured electrode potential is outside the calibrated range,
the [ISEErr] warning is displayed.
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