Light Sensor, FM

Description

The ABB KNX light sensor LF/U 2.1 is a brightness sensor for closed rooms.
The light sensor is mounted in a standard installation box in the ceiling.

The cover (white) of the sensor is stuck firmly onto the device. The complete unit is then screwed into a flush-type box.

On the Light Controller LR/S x.16.1 (x = 2 or 4) up to 2 or 4 Light Sensors LF/U 2.1 can be connected. The light sensor measures brightness values in closed rooms. When combined with the detected values, the Light Controller is used for constant light control. It is possible to combine the brightness values from several Light Sensors for the calculation of an individual control circuit.

It is thus possible to achieve control of the lighting in rooms with difficult lighting conditions.

The electrical connection to the Light Sensor on the Light Controller is carried out with a twin core MSR cable (SELV), e.g. KNX bus cable. The total length of this cable may not exceed 100 m. The Light Sensor is supplied with a Plexiglas rod which snaps into the sensor housing. The detection range can be limited  using the Plexiglas rod with the white coating. The Light Controller and the connect Light Sensor are supplied with power via the KNX and do not require any additional power supply.

Technical Details