Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 274)

4.7 Calibrating pH electrodes (CAL pH) and ISE (CAL Conc)
262
PC Control / Touch Control
Concentration calibration with up to 5 standards
Immerse electrode
in first standard
Start the
calibration com-
mand
Measure or enter
the calibration tem-
perature
If a temperature sensor is connected then the
temperature will be measured. Otherwise a query
will appear and the temperature must be entered
manually.
Message A message appears with instructions for the first
standard. Start the measurement with [OK].
(Stir and/or
pause before
measurement)
The solution is stirred before the measurement.
Pause will be allowed to elapse before the meas-
urement.
(Switch on stirrer) The stirrer will be switched on if Stir solution
during measurement is activated.
Measure
standard
The potential of the standard is measured.
(Switch off stirrer) The stirrer will be switched off if the measured
value has been accepted and if Stir solution
during measurement is activated.
Calculate calibra-
tion data
The calibration data, i.e. the slope, electrode zero
point E(0) and the blank concentration c(blank) are
calculated, the limits checked and, if necessary,
an appropriate message displayed. The calibration
data will be added to the sensor data for the par-
ticular sensor.
Optional steps are shown in brackets.
Repeat for
each standard