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MS-321LR Sky Scanner

  • Daylight analysis measurement system
  • Sky Irradiance and Illuminance
  • 145 sequential measurements
  • Auto measurement schedule
  • Integrated values over full hemisphere

The automatic Sky Scanner MS-321LR is designed only to measure Luminance and Radiance of the sky hemisphere. The sensor has 2 highly sensitive detectors which respond to the low light levels of the diffuse sky and will automatically block direct radiation by the active shutter function.

The sensor with a viewing angle of 11 degrees will capture the hemisphere in 145 sequential steps. The sensor is attached to a tracker positioner with two-axis control. The MS-321LR features a precise tracking mechanism that achieves high durability and repeatability. Measurements are based on the CIE108-1994 recommendation (CIE – International Commission on Illumination, IDMP – International Daylight Measurement Program).

The luminance values are measured per kcd/m2 and radiance value per W/m2/sr.

The sky scanner is predominantly used to study the radiation contribution of the diffuse sky which is an important parameter for building automation, building design, daylight software modeling and light pollution research. The advanced software control functions give full flexibility to export date for extensive research analysis and purposes.

Weight 15.5 kg
Dimensions 380 × 430 × 440 cm
ISO 9060:1990



Luminance range

< 50 kcd/m2

Irradiance range

< 300 W/m2

Sky scanning time 145 points

< 4.5 min.

Operating temperature range

-40 – 50 °C


RS-422 / 232C

Power supply

100 to 240 VAC, 20W

Dimensions mm

430 (W) x 380 (L) x 440 (H)


12.5 kg

Ingress protection IP


Cable length

10 m/20 m