Solar Monitoring Stations

STR-21G-S0

  • With Harmonic Drive®
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Solar Monitoring Stations

Features

  • Integrated sun-position sensor and GPS for quick, easy and accurate setup
  • Efficient, Cost-Saving, Low Power Consumption
  • Easy Integration with any DAQ system
  • Harmonic Drive® mechanical gear system, for maximum positioning accuracy
  • Deployed in Antarctica, proven in extreme climates worldwide

STR-21G-S0

  • With Harmonic Drive®

A turnkey solar monitoring station designed for high-precision solar radiation measurement, delivering industry-leading accuracy, reliability and value for solar energy research, monitoring, and meteorological applications.

Add to list
Solar Monitoring Stations

Features

  • Integrated sun-position sensor and GPS for quick, easy and accurate setup
  • Efficient, Cost-Saving, Low Power Consumption
  • Easy Integration with any DAQ system
  • Harmonic Drive® mechanical gear system, for maximum positioning accuracy
  • Deployed in Antarctica, proven in extreme climates worldwide
Find out more

Overview

The STR-21G-S0 is a turnkey sensor system designed to perform the most accurate solar radiation measurements of direct solar radiation. Compatible with almost all DAQ systems, with multiple analog and digital inputs, the STR-21G-S0 is equipped with an internal sun-position sensor and GPS receiver for quick and easy set-up.

Based on the STR-21G Sun Tracker, in combination with the Class A MS-57 Pyrheliometer, the STR-21G-S0 system can be freely configured to measure the required solar radiation components in the most accurate way. The MS-57 has a heated front window to avoid condensation and ice, which can affect the measurements, ensuring uninterrupted accuracy, whatever the weather.

STR-21G Specifications

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Description

STR-21G Sun Tracker

With integrated GPS, sun position sensor, and a Harmonic Geared type stepper motor, the STR-21G Sun Tracker is built to deliver unparalleled precision, optimal positioning, and reliability, whatever the weather.

Easy to set up, the STR-21G automatically adjusts to the sun's position, even if the tracker is not oriented or levelled correctly, and can support a range of Global, Diffuse and Direct Radiation measurement sensors for custom configurations.

The single configurable arm of the STR-21G can mount the MS-57 Class A Pyrheliometer for DNI readings and the optional MD-81-10 shading disk assembly, shielding any top-mounted pyranometer for diffuse solar radiation measurements.

Attribute View Product
Arms 1
Pointing accuracy Solar elevation: 0 to 87° < 0.01°
Angle resolution 0.009°
Rotation angle Zenith -15 to 95°
Rotation angle Azimuth 0 to 360°
Torque 12 N⋅m
Payload side arms 7kg
Sun sensor FOV 30°
Ingress protection IP 65
Operating temperature range -40 to 50°C
Communication RS-422 / 232C
Power consumption < 20W
Motor Stepper motor
Driving technology Harmonic Drive®
Tracking modes Automatic & Manual
Tripod Table tripod
Pyrheliometer mount Adjustable / One sensor position
Cable length 10m
Weight 14.5 kg (with tripod)

MS-57 Specifications

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Description

MS-57 Pyrheliometer

The MS-57 Class A Pyrheliometer is a fast, accurate, stable, and exceptionally reliable direct normal incidence (DNI) solar irradiance sensor.

'Fast-response' and 'spectrally flat' under ISO 9060:2018 specifications, each MS-57 is calibrated outdoors and tested against reference sensors fully traceable to the World Radiometric Reference. With an integrated low power window heater to prevent dew deposition or frost on the outside window, and competition-beating long-term stability, the MS-57 is truly 'all-weather' and perfectly suited to a range of applications.

Attribute
ISO Specifications
ISO 9060:2018 Class A
Response time 95% < 0.2 Sec
Zero offset A - Thermal Radiation (200W/m²) 0 W/m²
Zero offset B - Temperature change (5K/hr) ± 1W/m²
Zero offset C - Total zero off-set ± 1W/m²
Non-stability (change/year) < 0.5% / 5 years
Non-linearity (100 to 1000W/m²) ± 0.2%
Spectral Error ± 0.2%
Temperature Response (-20°C to 50°C) ± 0.5%
Tilt Response (0-90° | 1000W/m²) ± 0.2%
Technical Features
Wavelength Range (nm) 200 to 4000 (50% points)
Irradiance range (W/m²) 0 to 4000
Sensitivity (μV/W/m²) Approx. 7
Signal Output Analog
Impedance (Ω) < 15000
Operating temperature -40 to 80°C
Ingress Protection IP 67
Standard Cable Length 10m (Optional lengths 20m, 30m, 50m)
Window Heater Power Requirement DC 12V / 0.5W
Temperature Sensors PT-100 Class A, Thermistor 44031 10kΩ

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