The ABB PMH/U4.5.1 Presence Detector HF KNX Premium is the 4-channel 24 GHz ceiling presence sensor with an integrated room temperature controller and 5 logic channels. Choose white matt or black matt below.

Same 360° HF platform as PMH/U2.1.1 Basic (brightness, temperature, humidity, KNX Data Secure), plus constant-light control (not only switching) for two light bands. Mounting accessories: PMA/A1.1, PMA/K1.1, PMA/K2.1.

Key Features

• 24 GHz HF radar: Presence detection through drywall, wood, and glass.
• 4 KNX channels: Lighting plus HVAC-oriented objects on one head.
• Constant light control: Up to 2 outputs for brightness-dependent light bands.
• Integrated RTC: Object room temperature controller in the detector.
• 5 logic channels: Delayed switching for stairs, gates, and interlocks.
• KNX Data Secure + 2 finishes: White matt (−884) and black matt (−885).

At a Glance

Specification	Detail
Product type	KNX HF presence detector, 360°, Premium, IP20
Order family	PMH/U4.5.1-88x
Technology	24 GHz HF radar
Channels	4
RTC / logic	Integrated object RTC · 5 logic channels
Detection (circular)	Ø max. 8 m @ 2.5 m · 10 m @ 3.0 m · 8 m @ 4.0 m
Finishes	White matt (−884) · Black matt (−885)
Protection	IP20
Bus system	KNX TP · Data Secure

Color / Order Codes

Finish	Order code	Product ID
White matt	PMH/U4.5.1-884	2TYZ510212G0601
Black matt	PMH/U4.5.1-885	2TYZ510212G0701

Product manual, installation instructions, EPLAN, and CAD/BIM are under Downloads.

Applications

• Open offices: Constant-light control on two bands plus presence HVAC enable.
• Meeting rooms: RTC in the ceiling head without a wall thermostat.
• Stair / gate logic: Use the 5 logic channels for delayed off.
• Basic-only projects: 2-channel PMH/U2.1.1.

Installation Notes

Cut a Ø 68 mm ceiling hole, or use PMA surface / BS / VDE kits. Bus-powered (no auxiliary mains). Parameterise channels, RTC, and logic in ETS; follow the product manual in Downloads.