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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
  • Digital MODBUS 485 RTU output for DNI, GHI, DHI

A cost effective system combining MS-90 and MS-80 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-80. 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 system provides a digital output signal (Modbus 485 RTU) and can be easily connected to various data acquisition systems in solar energy projects and meteorological stations (dataloggers, inverters, SCADA etc). It can also be connected to a PC.

The MS-90 DNI sensor has a broad spectral response (300-2500 nm) and is calibrated outdoors with a pyrheliometer.

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

Class C (DNI) + Class A (GHI, DHI)



Temperature response -20°C to 40°C

+/- 5 %


+/- 2.5 %

Operating temperature range

-20 – 45 °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)


2.5 kg

Ingress protection IP


Cable length

10 m

Geographic application

Lattitude (-58º to 58º ) / Longitude (0º to 360º)

Power consumption

< 6 W