wtw inoLab 740, Operating Manual

Page: 80 / 274

pH
80
Calibration interval The calibration interval determines the time interval between
regular system calibrations.
The terminal reminds you to calibrate regularly by the
flashing probe symbol on the display.
The calibration interval is set to 7 days in the factory. You
can change the interval (1-999 days).
For most applications, we recommend a shorter calibration
interval.
1 Switch to the Menu mode.
2 Use
46
to select the main Cal menu.
3 Use
82
to select the Cal Int. ... menu item.
4 Use
g
to confirm the Cal Int. ... menu item.
The Calibration interval entry window appears.
5 Option:
Switch between the individual digits with
46
.
6 Increase or reduce the value with
82
.
7 Confirm the value for the calibration interval with
g
.
8 Use [ESC] to terminate the Menu mode.