From the Sensors list in the More tab you can configure the sensitivity and tolerance of a daylight sensor. Tap on the Daylight sensor option to open the settings.

Altering Sensitivity will determine the reaction time of the sensor when changes in detected illumination occur.

The Tolerance determines how large change in illumination is required before the sensor will react.

Usually for testing purposes the sensitivity and tolerance settings are low, but in normal use the settings are typically set higher to ensure that rapid changes in measured illumination do not result in rapid changes of the artificial lighting (e.g. if a cloud temporarily covers the sun you may not need the artificial lighting to react).

The daylight sensor can also be calibrated. This CALIBRATION may be needed because the lux value received by the sensor is typically not the same as the actual lux received on the surface below it (A downward facing ceiling mounted sensor receives reflected light whereas the surface under the sensor typically receives direct light). To enter a calibration value tap on the Current value and then enter the actual lux value measured on the surface of interest (e.g. A sensor positioned above a desk may be measuring 400 lux, but the actual lux value measured by a lux sensor placed on the desk surface may be 500 lux. When configuring a Closed loop daylight scene (to enable constant light levels to be maintained), you can then set your target lux value to the lux value you wish to achieve on the desk surface. 

Closed loop, and other daylight sensor configuration options and settings are done when creating a daylight scene (see the Daylight scenes section).

Note: If multiple lux sensors control the same luminaire, the average of all lux readings will be the used value.