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MS-40S Pyranometer


Make: Eko (Japan)

Model: MS-40S

  • ISO 9060:2018 Class C (Second class)
  • “Spectrally flat”
  • ISO 17025 certified calibration
  • 5 year warranty and recommended recalibration
  • Smart interface: (MODBUS 485 RTU, SDI-12, 4-20mA, configurable 0-10mA / 0-1V with external optional 100Ω precision shunt resistor)
  • Diagnostic functions (relative humidity, temperature, tilt angle)

The MS-40S is an ISO 9060:2018 Class C pyranometer which is based on EKO’s universal sensor platform. This sensor can be used in many meteorological networks and professional small scale PV sites where solar radiation is taken seriously.

The MS-40S uses smart sensor technology and on-board diagnostic functions which are now standard for all EKO smart sensors. This technology preserves the high accuracy of the sensor while complying with the various output standards used in the industry. The new Smart signal transducer allows selecting from 4 types of output in one unit (MODBUS 485 RTUSDI-124-20mA, configurable 0-10mA / 0-1V with external optional 100Ω precision shunt resistor).  The new electronics ensure a great benefit for system integrators who work with various industrial interface standards.

The MS-40S with Smart transducer will also have additional features such as internal temperature and humidity sensors and a tilt sensor for remote sensor diagnostics. These additional internal sensors will help the user to monitor the stability of the irradiance sensors as well as to ensure its proper installation and maintenance practices.

The MS-40S can be used with the optional MV-01 ventilator / heater or can be combined with the optional mounting kit for albedo measurements.

The MS-40S 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


(MODBUS 485 RTU, SDI-12, 4-20mA, configurable 0-10mA / 0-1V with external optional 100Ω precision shunt resistor)

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

5 – 30 VDC

Power consumption

< 0.2 W

Additional signal processing errors

< 1 W/m²