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

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    Buy cheap 5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21 from wholesalers
     
    Buy cheap 5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21 from wholesalers
    • Buy cheap 5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21 from wholesalers
    • Buy cheap 5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21 from wholesalers
    • Buy cheap 5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21 from wholesalers

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

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    Certification : CE RoHS
    Model Number : 5WG1255-2DB21
    Payment Terms : T/T,Western Union
    Delivery Time : 7 Days
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    5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21

    5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH
    Product Overview

    The 5WG1255-2DB21 (UP 255D21) is a KNX brightness sensor with integrated constant light level controller, designed for ceiling installation. Unlike presence detectors, its primary function is precise illuminance measurement via reflected light from the working plane below, with a range of 0–2,000 lux.

    It supports mixed-light measurement to distinguish between daylight and artificial light contributions. The built-in constant light controller manages up to 5 lighting groups (1 main + 4 additional), maintaining a configured lux setpoint by automatically dimming or brightening artificial lighting. An integrated IR receiver supports 6-pair remote control, and the sensor can also detect motion for supplementary occupancy functions.

    Technical Specifications
    Product NameUP 255D21 – KNX Brightness Sensor with Constant Light Controller
    ProtocolKNX/EIB Twisted Pair (TP)
    Supply Voltage21–30 V DC via KNX bus (SELV)
    Measurement MethodReflected-light measurement from illuminated working plane
    Brightness Range0–2,000 lux (at ~30% surface reflectance)
    Monitoring Area360° horizontal, ~40° vertical; ~2 m diameter measurement zone
    Light Source DetectionMixed-light measurement (daylight + artificial light)
    Constant Light Control1 main lighting group + up to 4 additional groups
    Control Mode2-point control, fully automatic or semi-automatic
    Sub-group CalibrationAuto calibration for up to 4 sub-groups
    Auto DisableConstant light control auto-disables on manual dimming
    PIR DetectionIntegrated motion detection (supplementary)
    Detection Channels3 independent output channels + 1 HVAC channel
    IR Remote ControlIntegrated receiver/decoder, 6 button pairs
    IR Button FunctionsSwitch, dim, scene recall, value send, shade control
    MountingCeiling, 60 mm flush-mount box (min. 40 mm depth)
    Functional Blocks3 (Motion, Presence, HVAC)
    Bus CouplingIntegrated, bus terminal connection
    ProgrammingETS software + front programming button + IR remote
    Protection ClassIP 20
    CertificationsCE, KNX certified
    ETS CompatibilityETS 4.x and above
    Application Scenarios

    The UP 255D21 is designed for spaces where maintaining a consistent illuminance level on the working plane is critical, regardless of changing daylight conditions.

    Primary applications include offices with large windows, atriums, skylit corridors, retail showrooms, museums, and art galleries — any environment where daylight harvesting must be combined with artificial lighting to maintain visual comfort.

    The constant light controller automatically compensates for daylight variations, dimming artificial lights when sufficient natural light is available and increasing output when it is not. The mixed-light measurement ensures accurate distinction between daylight and electric light contributions for precise control.

    Quality 5WG1255-2DB21 KNX Brightness Sensor with Constant Light Controller 5-CH UP 255D21 for sale
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