wtw MultiLab P5, Operation Manual

Page: 64 / 251

pH measurement pH measurement
64
BA61101/08.00/IWa/MLP5-E2 BA61101/08.00/IWa/MLP5-E2
65
Further calibration functions
Summary of the calibration functions
3 different calibration procedures are available:
1) AutoCal TEC:Calibration with two WTW technical buffer solutions
2) AutoCal: Calibration with two DIN/NIST buffer solutions.
3) ConCal: Conventional calibration with adjustment of
asymmetry (Offset) at pH = 7 and slope with
two buffer solutions.
AutoCal (DIN/NIST buffer solutions)
Ãmeth.
Âmenu
ÀCal
ÁpH
25.4°C
AR TP
AutoCalDIN
ÂpH
ConCal
¡AutoCalTEC
Select calibration
procedure.
For AutoCal DIN use two buffer solutions acc. to DIN 19266, e.g.
pH = 6.865 (25°C) and pH = 4.006 (25°C).
For the AutoCal DIN procedure the data of five DIN standard buffer
solutions are stored:
pH = 1.679, pH = 4.006, pH = 6.865, pH = 9.180 and pH = 12.454
(buffer values at 25°C)
ConCal
ÂpH
AutoCalTEC
¡AutoCalDIN
Select calibration procedure
AutoCalDIN.
Rinse pH electrode and temperature probe and
immerse into first buffer solution.
Ãstop AR TP
AutoCalDIN pH
23.6
°C
5
mV
Start measurement.
ÃCd2 *AR TP
AutoCalDIN pH
23.6
°C
2
mV
Wait until
¡
appears before
the AR. (Signal sound).
Rinse pH electrode and temperature probe and
immerse into the second buffer solution.
Ãstop AR TP
AutoCalDIN pH
23.6
°C
170
mV
Start measurement.
AutoCalDIN ¡
S=-59.2 mV/pH
Uasy= -1 mV
ÂpH
Wait until the electrode data
are displayed. The data are
stored with date and time.