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

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

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

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

Protocol	KNX TP, S-Mode ETS; mixed daylight + artificial light measurement
Mounting	Ceiling flush box min. Ø60 mm x 40 mm depth; surface adapter optional
Constant Light Controller	Integrated — main group + up to 4 additional groups
Control Mode	Fully automatic with self-calibration included
Switching Output	Integrated 2-point control (switching function)
Lux Setpoint	Configurable per group; different zone targets
Calibration	Automatic; no recalibration needed
IR Decoder	Integrated for S 255/11 remote
Programming Button	Front-accessible
Power Supply	Integrated bus coupler; DC 21–29 V KNX bus; no external power
Dimensions & Certification	88x63x88 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.

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

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