MS-90 Plus+ Trackerless Solar Monitoring Station

  • GHI measurements of the highest accuracy and lowest uncertainty with Class A pyranometer
  • DNI measurement with <5% uncertainty
  • No sun-tracker required
  • GPS receiver for easy setup
  • Digital MODBUS 485 RTU output for DNI, GHI, DHI
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A cost effective system combining MS-90 and MS-80S for DNI, GHI and DHI data without sun tracker. MS-90 Plus+ is the combination of two innovative irradiance instruments from EKO: MS-90 DNI sensor and the fast response Class A pyranometer MS-80S. These two instruments are connected via a special interface box (C-Box) with a GPS receiver and an processing unit. The system accurately measures DNI and GHI and calculates Diffuse irradiance (DHI) from the measurement data and the sun position. The C-box is delivered with a 10m cable, the sensor has a 1.5m cable to connect to the C-box.

The system provides a digital output signal (Modbus 485 RTU) and can be easily connected to various data acquisition systems in solar …

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System configuration
MS-90 Plus+


  Specifications MS-90 Plus+
  ISO 9060:2018 Class C (DNI) + Class A (GHI, DHI)
  Output DNI, GHI, DHI (MODBUS 485 RTU)
Temperature response -20°C to 40°C +/- 5 %
Non-linearity +/- 2.5 %
  Operating temperature range -20 - 50 °C
Wavelength range 300 - 2500 nm (50% points)
  Power supply 10.5 - 12.5 VDC
  Dimensions mm 350 (W) x 250 (L) x 200 (H) (Incl. optional base plate)
Weight 2.5 kg
  Ingress protection IP 67
  Cable length 10 m
  Geographic application Lattitude (-58º to 58º ) / Longitude (0º to 360º)
Power consumption < 6 W

MS-90 DNI Sensor

C-Box Modbus Processing interface

MS-80S Pyranometer

Applications and uses

The accurate solar radiation measurements and the reliable driving require a little knowledge and attention: think about environmental influences (wind, rain/snow, soiling), re-calibration (bi-annual), without mentioning data processing, spectral effects, …

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Solar radiation is not only the driving force behind the Earth’s weather phenomena, it also drives photovoltaic energy production. One day of solar energy received by the Earth exceeds the …

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