Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 271)

4 Parameters
PC Control / Touch Control
259
• Unit Conc. (d): Select the concentration unit of the standard. The
concentration unit for concentration measurements always depends
on the unit entered for the concentration of the standard.
• Conc. standard 1 to Conc. standard 5 (d): Enter the concentra-
tion for 1 to 5 concentration standards. off means that the standard
and all those following will not be used. During the sequence a
message will appear the corresponding number of times to indicate
the next standard to be used.
Under Stirrer control you can edit the parameters for controlling the
stirrer during the calibration. Take care that you have selected a stirrer
under Edit command/Stirrer.
• Stir solution during measurement (d): Automatically switches
the stirrer on/off at the start and the end of the measurement.
• Stir before meas. (d): If stirring is switched off during the meas-
urement, the solution can be stirred before the measurement. Enter
the corresponding time here.
• Pause before meas. (d): If stirring is carried out before the meas-
urement, a pause interval can be entered here. No stirring or meas-
uring occurs during this time.
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.
2-Point calibration with automatic buffer recognition
Immerse electrode
in first buffer
With automatic buffer recognition the order of the
buffers does not matter.
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.
(Stir and/or
pause before
measurement)
The solution is stirred before the measurement.
Pause will be allowed to elapse before the meas-
urement.