Pyrheliometer - Product Models

MS-56 Pyrheliometer

The ISO First Class MS-56 is a direct normal incidence (DNI) solar irradiance sensor. Also known as a pyrheliometer, it is used as a reference sensor for routine operation on a Solar Tracker. The all-weather ...
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Pyrheliometers are used to measure the Direct irradiance emitted by the sun in a 5 degree angle. The ISO9060 First Class MS-56 is a research grade normal incidence direct solar irradiance sensor also known as a pyrheliometer or DNI sensor which highly suitable for routine operation on automated Sun Tracker. The all-weather MS-56 is sensitive to solar irradiance throughout the spectral range 200 to 4,000nm and can work under most extreme conditions in a temperature range from -40°C to +80°C.


In principle to perform high precision direct solar radiation measurements under non stable atmospheric conditions ideally a fast responding detector is required to detect quick radiation changes. Although photo diode type detector offer a quick response but have a limited spectral sensitive range, in contrary thermopile broad band detectors cover the full spectral range however considered to be slow. The versatile MS-56 combines all those features of a quick broadband detector enabled by a advanced thermopile detector.

Specifications (Typical) MS-56
ISO 9060 classification First Class
Response time 95% < 1 
Zero offset - Thermal radiation (200W/m²) 0 W/m²
Zero offset - Temperature change (5K/hr) < 1 W/m²
Non-stability (change/year) < 0.5 %
Non-linearity (at 1000W/m²) < 0.2 %
Directional response (at 1000W/m²) N/A
Spectral selectivity (0.35-1.5µm) < 1 %
Temp. response (-20°C to 50ºC band) < 0.5 %
Tilt response (at 1000W/m²) < 0.2 %
Sensitivity (µV/W/m²) 6 - 10
Impedance (Ω) Approx. 5000
Operating temperature range (°C) - 40 to +80
Cable length 10m
Wavelength range (> 50% transmittance) 200 to 4000 nm