MS-56 Pyrheliometer

Note: this product is obsolete

  • ISO 9060 First Class Pyrheliometer
  • Fast < 1 s response detector
  • ISO17025 / 9059 Outdoor calibration
  • Window heater to prevent dew and frost
  • 5 years warranty
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The ISO First Class MS-56 measures direct normal incidence irradiance (DNI). Also known as a pyrheliometer and used as a reference sensor for routine operation on a Solar Tracker. The all-weather MS-56 is sensitive to solar irradiance in the spectral range from 200 – 4000nm and works under the most extreme conditions in a temperature range from -40°C -80°C. The versatile MS-56 combines all features of a quick broadband detector enabled by an advanced technology thermopile detector.

The integrated low power window heater prevents dew deposition or frost on the outside window. The MS-56 has a robust but compact and smooth design which forms the new generation of EKO Instruments solar radiometers that are designed for most demanding Photovoltaic and …

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  Specifications MS-56
  ISO 9060:2018 First Class
  Output Analog (mV)
Response time 95% < 1 Sec.
Zero off-set a) 200W/m² 0 W/m²
Zero off-set b) 5K/hr < 1 W/m²
Complete zero off-set c) < 1 W/m²
  Non-stability change/1 year < 0.5 %
  Non-stability change/5 years -
Non-linearity at 1000W/m² < 0.5 %
  Spectral selectivity 0.35-1.5µm -
Temperature response -20°C to 50°C < 0.5 %
Tilt response at 1000W/m² < 0.2 %
Sensitivity Approx. 10 µV/W/m²
  Impedance Approx. 5000 Ω
  Operating temperature range -40 - 80 °C
Irradiance range 0 - 4000 W/m²
Wavelength range 200 - 4000 nm (50% points)
  Ingress protection IP 67
  Cable length 10 m



Applications and uses

Solar Direct Normal Irradiance (DNI) represents the direct solar component and contains about 80% of the total solar energy budget on earth. Outside the atmosphere (AM0) the solar irradiance is …

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Concentrating Photovoltaics (CPV) is driven by only direct solar radiation. To quantify the energy efficiency of a CPV system the total DNI and direct spectral solar irradiance, called spectral DNI, can …

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