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MS-40 Pyranometer


Make:  Eko Model:  MS-40
✅ Most cost-effective irradiance sensors, designed to measure Solar irradiance across the full solar spectrum.
✅ Measurand: Solar Radiation
✅ Sensor Type: Thermopile (ISO 9060:2018 )
✅ Signal Output: Analog (mV)
✅ Supplied With: 10m Cable (Optional lengths 20m, 30m, 50m)

The MS-40 is an ISO 9060:2018 Class C pyranometer which is based on the EKO’s universal sensor platform. It is the most cost effective irradiance sensor to measure Solar irradiance accross the full Solar spectrum. It can be used for agro meteorological networks and professional small scale PV sites where solar radiation is taken seriously. The MS-40A and MS-40M provide a digital output (4-20mA or Modbus 485 RTU). The MS-40/40A/40M can be used with the optional MV-01 ventilator / heater or can be combined with the optional mounting kit for albedo measurements.

The MS-40 pyranometers are manufactured in a consistent way followed by strict quality inspection and performance evaluation. EKO provides a unique calibration compliant to the international standards defined by ISO/IEC17025/9847.

The sensor has a 5 year warranty with a 2 year re-calibration interval recommended and it is no longer necessary to change the desiccant.


Eko (Japan)



General Specification





Voltage (mV)

Measuring Range

0 to 2000 W/m²


Class C

Long-term Instability

± 1.5 %


± 1 %

Operating Conditions

-40 to 80 °C


Approx. 7 to 14μV/W・m-2

Spectral Range

285 to 3000nm

Zero off-set a) 200W/m²

± 12 W/m²

Zero off-set b) 5K/hr

± 5 W/m²

Complete zero off-set c)

± 17 W/m²

Tilt Response

± 1 %

Spectral Error

± 0.2 % (Spectral selectivity ± 3%)

Temperature Response

± 3 %

Response Time (95%)

< 18 Sec

Protection Level

IP 67

Cable length

10m (Optional lengths 20m, 30m, 50m)

  • What Is output of MS-40 Pyranometer?

    The MS-40 provide a Analog (mV) output.