LDF+

The brightness sensor for ceiling installations detects indoor and outdoor light levels in living rooms, offices or at workplaces depending on the type of prism. The sensor is adapted to the spectral sensitivity of the human eye and serves together with control systems for an on-demand light or sun protection control. The remote sensor is connected to the enclosure via conventional RJ45 cables, making it easy to install in hardly accessible places. If two sensors are used, the individual values, the mean, minimum or maximum value can be provided through both output signals (configurable via Thermokon USEapp).

Measuring values	luminosity
Output voltage	1x/2x 0..10 V or 0..5 V (adjustable via jumper; live-zero configuration via Thermokon USEapp), min. load 10 kΩ
Output ampere	1x/2x 4..20 mA, max. load 500 Ω
Output switch contact	Relay: 2x floating contact NO for 24 V ~ or 24 V = / 3 A, optional
Network technology	RS485 BACnet (MS/TP), LON FT (free topology), RS485 Modbus
Power supply	15..35 V = or 19..29 V ~ SELV, A: 15..35 V = SELV
Power consumption	typ. 0,6 W (24 V =) \| 1,5 VA (24 V ~), A: max. 20 mA (24 V =), AA: max. 40 mA (24 V =)
Measuring range light	0..200 Lux \| 0..1000 Lux \| 0..2 kLux \| 0..10 kLux \| 0..20 kLux \| 0..50 kLux, selectable at the device
Accuracy Light	±5% of measuring range, calibration via Thermokon USEapp
Sensor	Ambient light sensor with precise optical filtering appropriate to the human eye
Prism	acrylic glass clear, straight, diagonal
Enclosure	enclosure USE-M, PC, pure white
Protection	IP30 according to EN 60529
Cable entry	Flextherm M20 for wire Ø=4,5..9 mm, Relay/BUS: M25 with fourfold cable entry for wire with max. Ø=7 mm, removable
Connection electrical	removable plug-in terminal, max. 2,5 mm², BUS terminal: removable plug-in terminal, max. 1,5 mm², sensor wire (patch cable) length=1,5 m (default), max. 10 m, plug RJ45
Ambient condition	-25..+65 °C, max. 85% rH non-condensing
Delivery contents	incl. mounting base enclosure USE-M pure white