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MS-40S Pyranometer


Make:  Eko    Model:  MS-40S
✅ Most cost-effective irradiance sensors, designed to measure Solar irradiance across the full solar spectrum.
✅ Measurand: Solar Radiation
✅ Sensor Type: Thermophile (ISO 9060:2018)
✅ Signal Output: Modbus 485 RTU / SDI-12
✅ Supplied With: 10m Cable (Optional lengths 20m, 30m, 50m)

The S-Series MS-40S ISO 9060:2018 Class C pyranometer is a cost-efficient part of the most accurate, reliable and robust family of pyranometers in the world, and the class-leading solution for system integrators, agrometeorological networks, and professional small-scale PV sites.

Built with the same unique S-Series features as the Class A MS-80S and Class B MS-60S, the MS-40S comes with EKO’s 4-channel smart interface for compatibility with 99% of data loggers, DAQ, and SCADA systems, plus internal diagnostic sensors for remote visibility over internal temperature, humidity, tilt and roll angle; ensuring optimum performance with reduced maintenance costs.

With Level A EMI/EMC electronic surge filter and protection, 5-year warranty, lifetime desiccant, and ISO 17025 accredited calibration, the MS-40S is the toughest, most reliable, and advanced Class C pyranometer available.


Eko (Japan)



General Specification





Modbus 485 RTU / SDI-12 / 0-10mA / 0-1V

Measuring Range

0 to 2000

Power Supply

5 to 30 VDC

Power Consumption

< 0.2 W


IP 67

Long-term Instability

± 1.5%


± 1%

Operating Conditions

-40 to 80 °C


Approx. 7 to 14μV/W・m-2 ,0-1V/4-20mA: 0-1600W/m2 (3)

Spectral Range

285 – 3000 (50% points)

Zero off-set a) 200W/m²

± 12W/m²

Zero off-set b) 5K/hr

± 5W/m²

Complete zero off-set c)

± 17W/m²

Tilt Response

± 1%

Spectral Error

± 0.2%

Temperature Response

± 3%

Response Time (95%)

< 18 Sec

Protection Level

IP 67

Cable Length

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