Helvar 321 Multisensor – Excellent Detection Performance Through High Sensitivity and Multidirectional Coverage

321 Technical Data

321 Connections

DALI: Removable connector block
Wire section: 0.5–1.5 mm², solid or stranded

Cable rating: All cables must be mains rated.

321 Electrical Data

DALI supply input: 12–22.5 V
DALI consumption: 10 mA Max

321 Sensors

Light sensor: For constant-light functions
Presence detector: Passive infrared (PIR)

321 Operation

Start-up time: ≤1 sec

321 Mechanical data

Recommended mounting height: Max. 4 m
Presence detection coverage area: 46 m² @ 2.5 m mounting height
Mounting hole diameter: 51 mm +/- 1 mm
Note: If replacing an older sensor, 52–55 mm mounting hole is acceptable.

Ceiling thickness: Maximum 25 mm
Bezel diameter: 66 mm
Recommended clearance depth: 10 cm (with cable cover, including 5 cm for cabling)
Dimensions: 321, 321B: 66 x 62 mm
321P, 321PB: 66 x 67.75 mm
Material (casing): Nonflammable PC/ABS (UL94–V0)
Finish/Colour: 321, 321P: Semi-matt / White RAL 9003
321B 321PB: Semi-matt / Anthracite grey RAL 7016
Weight: 66.3 g
IP rating: 321, 321B: IP30, [IP20 cable cover] 321P, 321PB: IP65

Operating and storage conditions

Ambient temperature: 0 °C to +50 °C
Relative humidity: Max. 90 %, noncondensing
Storage temperature: -10 °C to +70 °C

Conformity and standards

Conformity: CE UK CA
EMC emission: EN 55015
EMC immunity: EN 61547
Safety: EN 61347-2-11
Environment: Complies with WEEE, RoHS and REACH directives.

Compatibility

Designer: 5.4 or later
Toolbox: 2.4.2 or later

Also stocked within the same range

321D2

Multisensors in lighting are advanced, combined devices—usually integrating motion (PIR), light level (lux), and sometimes temperature or noise sensors—used to automate and optimize energy efficiency in smart lighting systems. They offer features like occupancy detection, daylight harvesting, and data collection, allowing for automated dimming and increased safety.

Key Features and Functions

Energy Efficiency: These sensors can yield up to 60% energy savings by turning off lights when no one is present or dimming them when natural light is sufficient.

Multiple Sensing Technologies: A single unit typically combines passive infrared (PIR) for movement, lux sensors for daylight, and an IR receiver for manual, user-defined, or smartphone-app controls.

Adaptive Lighting: In addition to simply turning on/off, many, like Helvar’s DALI-2 corridorsensor, offer constant light control, adjusting output to maintain a set brightness.

Advanced Features: Some models include advanced sensors such as:

1. People-counting modules for building usage management, as seen in Legrand’s DALI multisensor.
2. Air quality monitoring (VOC levels).
3. Temperature and Humidity tracking.

Common Applications

Office & Indoor Lighting: Ceiling-mounted in offices, corridors, and hallways to detect presence and manage lighting, often within DALI-2, KNX, or Mymesh systems.

Outdoor/Street Lighting: Outdoor sensors, such as those from Philips Lighting, enhance safety by raising light levels when pedestrians or cars are detected, and lowering them otherwise.

Retail & Specialized Spaces: Track-mounted sensors for flexible commercial lighting.

Benefits

Energy Savings: Drastically reduce energy usage through automatic control, frequently allowing for, as described in Mode Lighting’s M-BUS MultiSensor page, up to 80% of additional savings through daylight harvesting.

Data Acquisition: In outdoor settings, sensors, like the ones from Philips, collect data on environmental conditions, such as temperature, noise, and tilt.

Simplified Installation: Designed for easy mounting in new or existing lighting infrastructure, frequently connecting via protocols like DALI or wireless networks.

Safety & Security: Increase security by ensuring spaces are well-lit upon arrival.

At Helvar they create intelligent and energy-saving lighting solutions.

Their Intelligent lighting is essential for the wellbeing of employees, customers, visitors, patients… and you! By combining smart data and reporting tools, and working together seamlessly with other manufacturers systems, Helvar’s solutions help to create smart environments built for the future.

Their products are regarded as best-in-class for reliability, compatibility and flexibility. With an extensive selection of advanced lighting solutions and components, they are unmatched when it comes to saving energy and enhancing comfort and mood.

From providing remote monitoring and maintenance, to using data to predict energy savings or to lower running costs by integrating to other building systems, their service offerings support buildings throughout their entire life cycle.

The company was originally set up in 1921 by Mr Walter Grueling and Mr Bengt Nybom. A century later, Helvar Oy Ab is now one of the global leaders in intelligent lighting solutions, with a world-class hybrid offering of wired- and wireless- control solutions, as well as a powerful platform of digital services.

Their mission is to Turn Everyday Places into Brighter Spaces; spaces which are perfectly functional, intelligent and designed for the future. Helvar is headquartered in Finland, with regional offices in Sweden and the United Kingdom, and we work closely with a network of over 80 expert partners across the world.

Helvar’s luminaire components division now operates as an independent manufacturer, producing world-class LED drivers and lighting components under the Helvar Components name.
As the company ventures into the next 100 years, the ‘Helvar spirit’ continues to live on– combining a passion for sustainability, customer closeness, a hardworking attitude and first-class industrial know-how into an ever-growing and successful team.