Xylem ProLab 1000 BENCH TOP pH METER User Manual
Page 56
Operation
ProLab 1000
56
ba75576e04
01/2011
Note
The measurement precision is also dependent on the selected
standard solutions. Therefore, the selected standard solutions should
cover the expected value range of the subsequent concentration
measurement.
Temperature while
calibrating and
measuring
For precise ISE measurements the temperature difference between
measurement and calibration should not be greater that 2 K. Therefore,
adjust the temperature of the standard and measuring solutions
accordingly. If the temperature difference is greater the [TempErr]
warning appears in the measured value display.
ISE Cal
This is the conventional two-point to seven-point calibration
procedure that uses 2 to 7 freely selectable standard solutions. The
concentration expected in the measurement determines the
concentration of the calibration standards.
Stability control
During calibration, the stability control is automatically activated.
The current measurement with stability control can be terminated at
any time (accepting the current value).
Calibration record
When finishing a calibration, the new calibration values are displayed
as an informative message ([
i] symbol) first. Then you can decide
whether you want to take over these values of the new calibration or
whether you want to continue measuring with the old calibration data.
After accepting the new calibration values the calibration record is
displayed.
Note
Based on the calibration data, the calibration line is determined in
sections according to the Nernst equation modified by Nikolski.
Display of calibration
data and download to
interface
You can have the data of the last calibration displayed (see page 68).
Subsequently, you can transmit the displayed calibration data to the
interface, e. g. to a printer or PC, with the <PRINT> key.
Standard solution (Std 1 - 7)
Values [mg/l]
Unit [mg/l]
0.010 ... 500000
Unit [mol/l]
0.100 ... 5000 µmol/l
10.00 ... 5000 mmol/l
Unit [mg/kg]
0.010 ... 500000
Unit [ppm]
0.010 ... 500000
Unit [%]
0.001 ... 50000