LDF+
Ceiling-mounted sensor used for the measurement of brightness or ambient light levels. Depending on the prism (straight or diagonal), light levels can be detected reliably and selectively in living rooms, offices and work spaces. The sensor is adapted to the spectral sensitivity of human eyes and contributes to a demand-based efficient control of light and sunblinds/shading systems. The remote sensor can be connected to the enclosure with a conventional RJ45 cable, allowing for an easy installation even in hardly accessible locations. If two sensors are used, the average, minimum or maximal value of both brightness signals can be provided in addtion to the independent measurements of each sensor (configurable via Thermokon USEapp).
| Measured values | luminosity |
|---|---|
| Output voltage | 1x/2x 0..10 V or 0..5 V (adjustable via jumper; live-zero configuration via app or uConfig), min. load 10 kΩ |
| Output current | 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 (IP) | 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 |
| Electrical connection | 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 content | incl. mounting base enclosure USE-M pure white |