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  Updated: 13 Nov 2018


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The SEV/SEC Sunshine Sensor is a versatile solar radiation sensor.

It uses an array of photodiodes with a unique computer-generated shading pattern to measure incident solar radiation.

Halmstad Library, Sweden


A microprocessor calculates the global and diffuse components of the radiation and determines the sunshine state.

  • Measures global (total) and diffuse radiation

  • Measures sunshine duration

  • No moving parts, no shade rings, and no motorised tracking

  • Outputs 0-10Vdc (SEV) or
    4-20mA (SEC)

  • Designed for measuring watt/m2












Sunshine Duration
The SEV measures sunshine hours indirectly using a simple equation based on both the total PAR radiation, and the ratio of total to direct PAR.

This sunshine algorithm corresponds closely to the World Met Office threshold of 120 W/m2 in the solar beam for sunshine duration.

The SEV does not need to be adjusted or repositioned to track the sun - a distinct advantage over devices with shadow rings.

There are no complex electro-mechanical assemblies and no burnt paper tracks to interpret.


Solar Blind Control

Modern buildings come with large areas of glass, and sophisticated building control systems.

The original architectural design inlcuded solar blind controls, triggered in this instance by the Energy detector included in the rooftop weather station (not visible in the picture).

Uncomfortable low-angle glare at sunrise and sunset is cut out by appropriate blind operation on the relevant side of the building.

During the middle of the day, direct sun heat loads on the glass are reduced by automatic blind closure in the affected area.

E-mail: ewert@automatikprodukter.se     

Phone: +46(0)31-287202

Mobile: +46(0)708885298



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