Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 276)

4.8 Calibrating conductivity measuring cells (CAL Cond)
264
PC Control / Touch Control
The parameters for Control device, Sensor and Stirrer are de-
scribed in Section 4.1.5.
Note!
Make sure that the sensor to be calibrated has been selected under
Edit command/Sensor. This is the only way to ensure that the cali-
bration data for this sensor is stored in the correct place under Sys-
tem/Sensors.
The choice of the Direct parameters is described in Section 4.1.6.
Sequence of the cell constant determination
Immerse measuring
cell in 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.
(Enter data of stan-
dard)
The characteristics of the calibration standard are
queried, if Request at calibration start is
activated.
(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 cell constant is calculated, the limits checked
and, if necessary, an appropriate message dis-
played. The calibration data will be added to the
sensor data for the particular sensor.
Optional steps are shown in brackets.