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BL-01 Sunshine recorder

  • Measures sunshine hours
  • Onboard GPS
  • Analog and digital output
  • Non-moving parts

The Blake-Larsen Sun Recorder is a simple and unique sensor to determine sunshine duration. It detects sunshine duration as the human eye would do by its design and measuring principle. In contrast with present methods, it even determines sunshine duration with dusk and dawn.

The Blake-Larsen Sun Recorder is unique! Sunshine is determined by mimicking the way a human would determine whether the sun shines. Light, reflected by the dome, passes through a special filter unto the LUX-sensor. A scientifically deduced algorithm then determines whether the sun is shining or not. Research and thorough testing ensured our method confines with the WMO standard.

The Blake-Larsen Sunshine Recorder is a smart sensor to measure sunshine duration with high accuracy (uncertainty 0.3 hours per day). The sensor is easy to install, can be applied globally and used for many applications.

Weight 14.5 kg
Dimensions 380 × 430 × 440 cm
ISO 9060:1990


5V/1V, 20mA/4mA and open drain switch

Wavelength range

300 – 800 nm (50% points)

Operating temperature range

-20 – 45 °C

Power supply


Dimensions mm

160x100x83 / Ø83×74 mm


0.8 kg

Ingress protection IP


Power consumption

< 0.5 W

Cable length

10 m

Geographic application

Lattitude (-90º to 90º ) / Longitude (0º to 360º)