ProLab 4000
Ion concentration
103
ba75646e03
12/2012
9.3
Calibration
Why calibrate?
Ion-selective electrodes age and are temperature-dependent. This
changes the slope. As a result, an inexact measured value is displayed.
Calibration determines the current value of the slope of the electrode
and stores it in the instrument.
Thus, you should calibrate before each measurement and at regular
intervals.
When to calibrate?
Before every measurement if possible
After connecting another ion selective (combination) electrode
Standard solutions
Use two to nine different standard solutions. The standard solutions
have to be selected in either increasing or decreasing order.
In addition to the list with defined values for the standard solutions, you
can enter any concentration for a standard.
Temperature for
calibrating and
measuring
For precise ion selective measurements, the temperature difference
between measurement and calibration should not be greater that 2 K.
Therefore, adjust the temperature of the standard and measuring solu-
tions accordingly. If the temperature difference is greater the
[TempErr]
warning appears in the measured value display.
Standard solution (
Std 1 - 9)
Values
Unit [mg/l]
0.001 ... 500000
Unit [mol/l]
0.010 ... 5000 µmol/l
10.00 ... 5000 mmol/l
Unit [mg/kg]
0.001 ... 500000
Unit [ppm]
0.001 ... 500000
Unit [%]
0.0001 ... 50000
Note
The measurement precision is also dependent on the selected stan-
dard solutions. Therefore, the selected standard solutions should
cover the expected value range of the subsequent concentration mea-
surement.
Содержание ProLab 4000
Страница 4: ...ProLab 4000 4 ba75646e03 12 2012...
Страница 10: ...Contents ProLab 4000 10 ba75646e03 12 2012...
Страница 20: ...Overview ProLab 4000 20 ba75646e03 12 2012...
Страница 30: ...Commissioning ProLab 4000 30 ba75646e03 12 2012...
Страница 68: ...System functions ProLab 4000 68 ba75646e03 12 2012...
Страница 86: ...pH ProLab 4000 86 ba75646e03 12 2012 Note A calibration line is determined for the two point calibration...
Страница 138: ...Ion concentration ProLab 4000 138 ba75646e03 12 2012...
Страница 184: ...Recorder ProLab 4000 184 ba75646e03 12 2012...
Страница 202: ...What to do if ProLab 4000 202 ba75646e03 12 2012...
Страница 216: ...Lists ProLab 4000 216 ba75646e03 12 2012...
Страница 227: ......