Thermal Measurement

IES represents EKO Instruments in Canada and India to provide thermal Sensors aimed to advance thermal measurement. EKO Instruments was established in 1927 for the production of scientific instrumentation for meteorological and environmental applications. Accumulating over 85 years of history, EKO now includes three core business areas as part of the Environmental Instruments Division.

  • Remote Sensing

  • Evaluation and measurement of photovoltaic performance

  • Radiation and spectral measurements

EKO works closely with industry and research organizations to develop new products for the future, and new markets are to be explored with the use of these technologies for applications in other fields. Exports of proprietary products are being strengthened with the establishment of marketing initiatives outside Japan and the continued creation of aggregate value to reach all customers through these relationships


EKO Instruments provide specific measurement solutions for the solar energy market. In the field of PhotoVoltaic (PV) systems, a wide range of products and measurement solutions is available for different applications, involving everything from cell evaluation (indoor measurements) to module and array evaluation (outdoor measurements). For the evaluation of solar cells, a deep know-how is available after years of experience and exploration in technology standards for pyranometers, radiometers and other meteorological instruments. The evaluation of PV systems conforming to world standards has allowed for a high demand of deployment in Europe and other areas overseas


The meteorological market has been driven by climate research to investigate phenomena like solar dimming, global warming, ozone layer depletion, effect of clouds on climate and optimizing weather forecast models. EKO meteorological products are installed all over the world in national and international meteorological networks to fulfill the stringent demands of the research community. EKO's wide range of products for meteorology complies with the existent WMO standards, for which certification, evaluations and workshops EKO has consistently been an active participant

ISO 9060 MS-Pyranometer Series


EKO Instruments’ own in-house designed and manufactured products are based on cutting-edge technology. With innovative and reliable products, EKO Instruments provides an extensive PV evaluation portfolio and a wide range of unique, reliable analysis systems for meteorological applications:

The MS-series boasts the know-how gained over 50 years of experience in developing and manufacturing solar radiometers. Compliant with the ISO 9060 and WMO standards, from the MS-802 highest class ISO Secondary Standard used for the most demanding applications, all EKO sensors provide a perfect balance between cost-effectiveness and quality

The ISO9060 First Class MS-56 is a research grade normal incidence direct solar irradiance sensor, sensitive throughout the spectral range 200 to 4,000nm and capable of working in a temperature range from -40°C to +80°C. The versatile MS-56 combines the features of a quick broadband detector enabled by an advanced thermopile detector



MS-602, MS-802 and MS-402 Pyranometers
MS-56 Pyrheliometer

Since their introduction, the MS Spectroradiometers were widely used as reference instruments for outdoors spectral irradiance measurements in the fields of Photovoltaic and Meteorological research. The expanded series with sophisticated temperature controlled instruments like MS-710 and MS-712 covers a wide spectral range for VIS-NIR-IR applications over a spectral range from 300nm up to 1700 nm. Separate power control units with serial communication interfaces, NIST traceable calibration and advanced data retrieval/storage functionalities are among the numerous features additional to the proved long-term stability of the MS-series spectroradiometers
  Small Sensors
Used as multi-purpose cost effective sensors for qualitative radiation measurements in the fields of photovoltaics, horticulture, agriculture and industry, the ML-series compact all-weather sensors rely on a passive high quality detector. Irradiance, illuminance or photo active radiation can be measured, and the compact dimensions of the sensor body make it easy to integrate to any type of applications. All sensors have an optical quality glass dome for optimal cosine response and their small ambient temperature effect make for reliable measurements under varying environmental conditions

MS-70 and MS-712 models

  ML-01 Si-Pyranometer

ML-01 SiPyranometer

UV Radiometers
EKO offers various types and classes of broad band filter or spectral UV radiometers for different applications and measurement purposes, whether for the UV-A (315-400nm) radiation wavelength range or the V-B (280-315nm) wavelength range. The precision UV radiometers are designed for high reliability and they are calibrated against NIST traceable standards. Well-designed UV-A /UV-B filters and a GaAsP photodiode guarantee high performance measurements from both the MS-212A and MS-212B
  Pyrageometers/Net adiometers
EKO's pyrgeometers and net radiometers are used for meteorological observations of atmospheric radiations (clouds, water vapor, CO2) and the net radiation exchange between the earth and the atmosphere. Net total irradiance (shortwave + longwave) is typically measured by 4 component net radiometers or single component pyradiometers which have a single detector covering the full range. Pyrgeometers measure the long wave down welling radiation by means of a single detector facing the atmosphere. The Net longwave and down welling radiation can be determined by calculation
MS-212A_w230   chamber04



MR-60 Net Radiometer

Sunshine Duration Sensors
EKO offers 3 different methods for measuring sunshine, either based on direct or global radiation measurements:
  • By means of an MS-56 pyrheliometer in combination with a sun tracker STR-21G/22G, providing the best accuracy.
  • Using the MS-093 Sunshine duration sensor, sensitive to only the direct radiation component providing a digital output when the irradiance exceeds 120 W/m2 (as defined by WMO).
  • Estimating the direct radiation component using a Pyranometer with a known solar position.


  Sun Trackers
EKO has a long tradition manufacturing fully automatic meteorological Sun Trackers which are used to accurately position solar sensors (Pyrheliometers, Pyranometers, Pyrgeometers) towards the sun, either to expose or shade a sensor from the direct sun beam. EKO Sun Trackers are very compact, robust and relatively light weight. Sun Tracker uses on each output shaft a Harmonic Drive unit, which is a leading drive technology with advanced motion control for those applications where high precision, durability, low backlash, high transmission ratios and torque are required. Additionally, its compact design and high transmission ratio small motors allow for low power consumption. All the STR Sun Trackers have a built in GPS receiver for accurate sun tracking and easy installation, with an automatic set up which controls it to the exact sun position using position coordinates and time information. The STR-series offers a comprehensive range of compact single and double arm Sun Trackers to accommodate all kinds of solar radiometers, up to the heavy duty STR-32G


MS-093 Sunshine sensor


STR-32G with MS-700 and MS-712 sensors

Photovoltaic Evaluation Systems
Besides IV curve tracers, for which manufacturing was started 20 years ago, EKO provides highly accurate and reliable solar radiation measurement equipment for outdoor use for the past 60 years. In the last 25 years, EKO has been contributing to the Photovoltaic industry by introducing standardized professional products and turnkey PV measurement solutions, to characterize cells, for performance monitoring of solar power systems and other renewable solar energy applications. Nowadays EKO Instruments provides a unique combination of PV measurement instruments and solar radiometers to measure most common PV related characteristics for indoors and outdoors applications:
  • PV Installation Test Kit
  • I-V Tracers, Checkers, and Electric Load.
  • PV Evaluation Systems: Outdoors & Indoors
  • Solar Simulator

Solar Simulator LP Series


EKO Sun Simulator

Heat Flux Sensors & Thermal Conductivity Testers

EKO has various types of thin substrate heat flux sensors and thermal conductivity testers in the product lineup, offering a practical solution for various needs and applications such as industrial research and manufacturing control processes. EKO heat flux sensors are available in different sizes and thickness.


Calibration Test Facilities

Test facilities at EKO comply with the highest standards and are designed to test different sensor properties indoors and outdoors. EKO's calibration methods are compliant to international standard procedures defined by ISO 9060 and are traceable to the international standards maintained at the designated national institutes. EKO's own facilities allow for high performance calibration and testing of:

  • Pyranometers, using measurements above global broad-band irradiance of 400W/m2
  • Pyrheliometers, against reference pyrheliometer traceable to the World Radiation Reference (WRR) maintained at the World Radiation Center in Davos, Switzerland.
  • Spectroradiometer (calibration check), performed indoors against a NIST traceable tungsten-halogen OL-FEL standard lamp at a distance of 50 cm or outdoors upon request
  • Temperature Dependency and Non-Linearity for thermopile detectors
  • Cosine Error for all 180° field-of-view radiometer models

Quality Management Statements

The EKO Instruments Ltd. Headquarters in Tokyo Japan has been continuously ISO 9001 certified since its first assessment in 1994. EKO undergoes regular audits by third-party ISO assessors and its own employees and the results are used to improve and strengthen EKO's quality management system. The quality program is evident from EKO's growing satisfied customer base, reflecting the company's strive to stay at the lead by continuous improvement of its products and services.

Recognizing the importance of environmental protection, EKO also follows Environmental Policy Statement ISO 14001. This Policy is communicated to all employees, suppliers and sub-contractors and is made available to the public.