Menu Close

MS-40A Pyranometer


Make: Eko (Japan)

Model: MS-40A

  • ISO 9060:2018 Class C (Second class)
  • Sub-category “Spectrally flat”
  • Industrial sensor outputs (4-20mA)
  • ISO 17025 certified calibration
  • Optional ventilator MV-01
  • 5 year warranty

The MS-40A is an ISO 9060:2018 Class C (Second Class) pyranometer which is based on EKO’s universal sensor platform with 4-20mA output. It is the most cost effective irradiance sensor to measure Solar irradiance accross the full Solar spectrum. The sensor can be used in many meteorological networks and professional small scale PV sites where solar radiation is taken seriously. 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-40A 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)



ISO 9060:2018

Class C

ISO 9060:1990

(Second Class)

Sub-category "Spectrally flat"


Sub-category "Fast response"

Not Compliant


Digital (4-20mA)

Response time 95%

< 18 Sec.

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

Non-stability change/1 years

+/- 1.5 %

Non-linearity at 1000W/m²

+/- 1 %

Directional response at 1000W/m²

+/- 20 W/m²

Spectral error

+/- 0.2 %

Temperature response -10°C to 40°C

+/- 3 %

Temperature response -20°C to 50°C

+/- 4 %

Tilt response at 1000W/m²

+/- 1 %



Operating temperature range

-40 – 80 °C

Irradiance range

0 – 2000 W/m²

Wavelength range

285 – 3000 nm (50% points)

Ingress protection IP


Cable length

10 m

Power supply

12 – 24 VDC

Power consumption

0.08 – 0.5 W

Additional signal processing errors

+/- 1.7 W/m²