EKO ML-01 Si-Pyranometer




Product Introduction
Product Features
Technical Details
Product Introduction

The ML-01 Si-sensor can be categorized between the reference cell and broadband thermopile pyranometer. Compared to the reference sensors it has a proper cosine response and it is relatively compact, but benefits from the same characteristics as a PV module (Response time, Spectral and temperature response). The ML-01 is an industrial grade solar sensor specially made for Performance ratio measurements as well as irradiance measurement applications for the meteorological, agricultural and environmental studies. The compact dimensions of the sensor body make it easy to integrate it within any application using it with or without mounting plate. For global horizontal measurement applications, the sensor can be mounted in horizontal position with the standard removable mounting plate with spirit level and leveling feet. The Mono-Silicon detector with UV resistant diffuser gives a cosine response also at low solar elevation angles. Besides the effects of soiling or water deposition on top of the diffusor will be minimized due to the cone shape geometry.

The ML-01 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 5 years warranty with 2 years re-calibration interval are recommended.

Product Features

  • Same spectral response as a PV module
  • Accurate solution for PV performance ratio monitoring
  • Low temperature dependency
  • Fast response photodiode detector
  • Industrial grade Si-pyranometer with removable mounting plate

Technical Details

Output Analog (mV)
Response time 95% < 1 ms
Zero Offset A 200W/m² 0 W/m²
Zero Offset B 5K/hr 0 W/m²
Non-stability change/1 year +/- 2 %
Non-linearity at 1000W/m² < 0.2 %
Directional response at 1000W/m² < 10 W/m²
Temperature response -10°C + 40°C < 0.15 %/°C
Tilt response 0 %
Sensitivity Approx. 50 µV/W/m²
Impedance 50 Ω
Wavelength range 400 – 1100 nm
Operating temperature range -30 – 70 °C
Irradiance range 0 – 2000 W/m²
Cable length 5 m


  • Accurate solar radiation measurements
  • Outdoor material testing
  • DHI Measurements
  • Solar Radiation Measurements in PV applications
  • Solar radiation energy budgets studies