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UP 255D21 KNX Brightness Sensor with Constant Light Level Controller 5WG1255-2DB21

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Certification: CE RoHS
Channel: 12 independent channels
Place of Origin: EU
Payment Terms: T/T,Western Union
Channel Configuration: 16 independent control channels
Packaging Details: Carton
Input Type: Binary Input
Delivery Time: 7 Days
Humidityrange: 10% to 90% non-condensing
Features: KNX bus-powered operation
Installation Type: Wall-mounted or embedded
MOQ: 5
Timer Function: Supports scheduling and timer settings
Model Number: 5WG1255-2DB21
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UP 255D21 KNX Brightness Sensor with Constant Light Level Controller 5WG1255-2DB21

UP 255D21 KNX Brightness Sensor with Constant Light Level Controller 5WG1255-2DB21
Product Overview

This KNX ceiling brightness sensor delivers precise mixed light measurement with an integrated constant light level controller for automatic daylight-harvesting dimming — no separate controller needed. Mounted compactly, it measures ambient illuminance while driving one main luminaire group plus up to four additional groups at a user-defined lux setpoint. Daylight increases cause proportional dimming; decreases cause ramp-up — saving energy with visual comfort. Self-calibration ensures accuracy. IR decoder supports S 255/11 remote.

Technical Specifications
ProtocolKNX TP, S-Mode ETS; mixed daylight + artificial light measurement
MountingCeiling flush box min. Ø60 mm x 40 mm depth; surface adapter optional
Constant Light ControllerIntegrated — main group + up to 4 additional groups
Control ModeFully automatic with self-calibration included
Switching OutputIntegrated 2-point control (switching function)
Lux SetpointConfigurable per group; different zone targets
CalibrationAutomatic; no recalibration needed
IR DecoderIntegrated for S 255/11 remote
Programming ButtonFront-accessible
Power SupplyIntegrated bus coupler; DC 21–29 V KNX bus; no external power
Dimensions & Certification88x63x88 mm; IP20; Data sheet A6V10489482; Warranty 24 Months
Applications

Offices with window walls, classrooms, open-plan workspaces, retail stores with glazed fronts, galleries where lighting must respond to daylight conditions. Pairs with KNX dimming actuators; 2-point output for non-dimmable on/off. Values broadcast for HVAC compensation or shading control.

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