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MS-40S Smart Albedometer

Make: Eko                                            Model: MS-40S
✅ Most cost-effective irradiance sensors, designed to measure Solar irradiance across the full solar spectrum.
✅ Measurand: Solar Radiation (Incoming & Outgoing)
✅ Sensor Type: Thermopile
✅ Standards & Classifications: ISO 9060:2018 Class C
✅ Signal Output: RS 485 MODBUS RTU, SDI-12
✅ Supplied With: 10m Cable (Optional 20m, 30m, 50m), Calibration Certificate

MS-40S Smart Albedometer: 

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 internal diagnostic sensors for remote visibility over internal temperature, humidity, tilt, and roll angles, ensuring optimum performance with reduced maintenance costs.

EKO’s 4-channel smart interface ensures that the MS-40S is compatible with 99% of data loggers, DAQ, and SCADA systems, and with its 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 most advanced Class C pyranometer available.

The MS-40S Albedometer consists of two MS-40S Pyranometers and the MS-Albedo Kit with a glare screen to measure albedo and total reflectance across various applications, including solar power plants with bi-facial PV modules.

MS-40S pyranometers are built with stringent quality controls and performance testing. EKO provides calibration compliant with the international standards defined by ISO/IEC17025/9847 with a 2-year recommended re-calibration interval.

Application and features of MS-40S Smart Albedometer:



✅ Small-scale PV plants
✅ Hydrology weather stations
✅ Agriculture research
✅ Level A EMI/EMC electronics surge filter & protection
✅ 5-year warranty
✅ 2-year recommended recalibration interval
✅ Smart 4-channel Analogue & Digital Interface
✅ Internal Diagnostics for temperature, tilt, roll, and relative humidity
✅ Calibration compliant with ISO/IEC17025/9847

Eko (Japan)



ISO 9060:2018

Class C

ISO 9060:1990

(Second Class)

Sub-category "Spectrally flat"


Sub-category "Fast response"

Non Compliant

Response time 95%

< 18 Sec.

Zero offset A - Thermal Radiation (200W/m²)

± 12W/m²

Zero offset B - Temperature change (5K/hr)

± 5W/m²

Zero offset C - Total zero off-set

± 17W/m²

Non-stability (change/year)

± 1.5%

Non-linearity (100 to 1000W/m²)

± 1%

Directional Response (at 1000W/m² | 0 to 80°)

± 20W/m²

Spectral Error

± 0.2% (Spectral selectivity ± 3%)

Temperature Response (-20°C to 50°C)

± 3%

Tilt Response (0-90° | 1000W/m²)

± 1%

Additional Signal Processing Error

± 1.5W/m²

Wavelength Range (nm)

285 – 3000 (50% points)

Irradiance range (W/m²)

0 – 2000


MODBUS 485 RTU, SDI-12, 4-20mA, configurable 0-10mA / 0-1V*

Sensor Diagnostic

Relative Humidity ± 2%, Temp. ± 0.1% / Tilt Angle ± 1°

Operating Temperature

-40 to +80 °C

Supply Voltage

5 – 30 VDC

Power Consumption

< 0.2 W

Ingress Protection

IP 67

Calibration Traceability / Uncertainty

ISO 17025 / WRR / < 0.7% (k = 1.96)

Standard Cable Length

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

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