10
3.5.3 Programme interval control
If the Interval mode is selected external devices are switched on for a minimum of 1 second (maximum 23 hrs ., 59
min . and 59 sec .) and switched off for a minimum of 30 minutes (maximum 96 hrs . and 59 min .) .
3.6 Manual activation/deactivation
Both slots can be turned on and off manually by combination of buttons to be pressed .
3.7 Display light
Factory presetting is an automatic adaptation of the display light . After pressing any button the display light is
switched on . When no button has been pressed for 120 seconds, the display light is automatically dimmed down . It is
possible to change from automatic light dimming to full illumination of the display .
3. 8 Calibration of the temperature sensor
The temperature sensors has a tolerance of +/-0 .5 °C . To compensate any possible deviation in comparence to an
external reference meter, a calibration is possible .
