{"product_id":"knightsbridge-recess-mount-5-8ghz-hf-motion-sensor-white","title":"Knightsbridge Recess Mount 5.8GHz HF Motion Sensor - White","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge OSHFREC is a recess-mount 5.8GHz high-frequency motion sensor designed to automate lighting in corridors, stairwells, storage rooms and other spaces where hands-free control improves convenience and energy efficiency. The sensor sits flush in the ceiling behind a 90mm white polycarbonate bezel, requiring a 62mm diameter cut-out and 35mm recess depth above the ceiling surface.\u003c\/p\u003e\n\u003cp\u003eThe 5.8GHz microwave detection technology provides 360° coverage across a 3m diameter zone when installed at a standard 3m ceiling height, detecting motion through non-metallic materials such as plasterboard and lightweight partitions. This makes it suitable for triggering lighting in rooms where occupants may be partially screened from the sensor. The unit supports loads up to 1000W incandescent or 100W LED on 230V mains, with adjustable time delay (30 seconds to 30 minutes), lux threshold (5-1000 lux) and sensitivity range (1-3m).\u003c\/p\u003e\n\u003cp\u003eFour operational modes are selectable via onboard controls: Auto (sensor activates light when motion is detected and ambient light falls below the set lux threshold), Short Pulse (briefly triggers light for confirmation without sustained illumination), Test (15-second intervals for installation verification), and Manual Override (forces light on regardless of motion or ambient light). The IP20 rating limits use to internal dry spaces only. The separate driver module connects to mains via a short fly-lead from the sensor head.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e90 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e132 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e29 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProjection\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecessed Depth\u003c\/td\u003e\n\u003ctd\u003e35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-out Diameter\u003c\/td\u003e\n\u003ctd\u003e62 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003ePolycarbonate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClass\u003c\/td\u003e\n\u003ctd\u003eII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIP Rating\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e230V 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_3945644_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/manual_1187150.pdf\" target=\"_self\"\u003eProduct Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat ceiling depth is required for installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe sensor requires a 62mm diameter cut-out and a minimum 35mm recess depth above the ceiling surface to accommodate the driver module and wiring. The sensor face projects just 2mm below the finished ceiling once installed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between HF and PIR sensors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHigh-frequency (microwave) sensors like this 5.8GHz unit detect motion through non-metallic materials such as plasterboard, whereas passive infrared (PIR) sensors require direct line-of-sight to the moving object. HF sensors are less prone to false triggers from temperature changes but may detect motion beyond walls in adjacent rooms if not calibrated correctly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the sensitivity and timer be adjusted?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The onboard controls allow adjustment of detection range (1-3m), time delay before the light switches off (30 seconds to 30 minutes), and lux threshold (5-1000 lux, controlling the ambient light level below which the sensor activates).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for LED lighting?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the sensor supports LED loads up to 100W or incandescent loads up to 1000W. For larger installations or multiple zones, pair the sensor with a contactor or relay to avoid exceeding the rated load.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293918093579,"sku":"OSHFREC","price":29.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/555468_953676f1-6e34-44c7-a161-7a30a7dde2fb.jpg?v=1714666247","url":"https:\/\/niori.co.uk\/products\/knightsbridge-recess-mount-5-8ghz-hf-motion-sensor-white","provider":"Niori","version":"1.0","type":"link"}