Bộ cảm biến Helvar - 329 External Light Sensor

329 External Light Sensor


 DALI External Light Sensor (329)


 The 329 DALI External Light Sensor, when used in conjunction with a Helvar Lighting Router based controls system, can provide energy savings by adjusting light levels based on the available daylight.

Mount the 329 outdoors to monitor the level of daylight. For instance, bright sunlight will raise the overall light level in the rooms of a building. The sensor will detect this, and the system will reduce the energy levels supplied to the lamps. If the day then becomes overcast, the system will respond to the lower levels of ambient light by increasing the energy provided to the lamps. By profiling the building (measuring the daylight contribution per room), the system can be used to maintain an approximate constant light level, and thereby reduce energy use.

The 329 is for mounting outdoors. The unit head assembly is waterproof when correctly installed and mounted vertically, and can tolerate a wide range of operating temperatures and conditions.



 Key Features

  • Open loop light control
  • Light range of 1 lx – 100 000 lx
  • Simple mounting
  • Easy connection to Helvar router system



 Installation Notes

  • The unit is intended for wall mounting.
  • Isolate the mains supply before installation.
  • Cabling must be 230 VAC mains rated.
  • Do not mount sensor in direct line of artificial light sources, e.g. lamps, uplighters.
  • The unit must be mounted vertically, i.e. with the clear Sensor Head Cover pointing upwards. Any convenient surface may be used as long as the sensor element has a reasonably unrestricted view of the sky.
  • To avoid the possible risk of lightning strikes, never install the external light sensor at the highest point on a building.



Technical Data




Wire size: 1.0 mm² – 2.5 mm²2-core solid, flexible or strandedMax. length: 300 m @ 2.5 mm²(part of DALI subnet)

Connector type:

Screw terminals:N: DALI+L0: DALI–L1: No connection

Cable rating:

All cables must be mains rated.

Power supply

DALI power supply:

13 V – 22 V

DALI consumption:

10 mA


Sensor element:

Photodiode matched to human eye response.

Light sensing angle:

When mounted vertically:• 85° from vertical• Horizontal plane: 360°

Working light range:

1 lx – 100 000 lx

Light level reading output:



Mounting angle:

Vertical (clear sensor head at top)

Mounting points:

2 × M4 (No. 8 woodscrew)For fixing centres, see diagram.

Mechanical data


148 mm × 82 mm × 87 mm


Base & mounting bracket:

Black ABS

Socket & sensor accessory:

Black glass-filled nylon

Sensor cover:

Toughened acrylic (UV stable)


250 g

IP code:


Operating conditions

Ambient temperature:

–35 °C to +70 °C

Relative humidity:

Max. 90 %, noncondensing

Storage temperature:

–35 °C to +70 °C

Conformity and standards

EMC emission:

EN 55015

EMC immunity:

EN 61547


EN 61347-2-11


Complies with WEEE and RoHS directives.


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