Radiometer Analytical TitraLab TIM840 Guide D'utilisation page 52

c. Enter the Periodicity.
Indicates the maximum period of time between two calibrations. If
the period of time is exceeded, pH measurements can no longer
be performed using this pH electrode. The electrode must be cali-
brated.
d. Enter the Number of buffers.
Enter the number of standards (1 to 5) to be used for the
calibration.
f. Specify if a temperature sensor is in use.
If a temperature sensor is in use, select Probe.
If the temperature is entered manually via the numeric keypad,
select Entered.
If the calibration is to be performed at 25°C, select Fixed 25°C.
If you have selected Temperature = Probe, a temperature sensor
must have been selected in the Parameters screen.
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Chapter 3