The DR01 is a high-accuracy direct (normal incidence) solar radiation sensor, also known as a pyrheliometer. This pyrheliometer is featured with a heated window to increase data availability and is used in two-axis tracker-mounted operation for both solar resource assessment as well as solar monitoring (for concentrated solar energy).
The DR01 complies with the first class specifications of the ISO 9060 standard and the WMO Guide.
Measurand | direct solar radiation |
Measurement range | 0 to 4000 W/m² |
Sensitivity (nominal) | 10 x 10⁻⁶ V/(W/m²) |
ISO classification | first class pyrheliometer |
Response time (95 %) | 12 s (nominal) |
Full field of view angle | 5º |
Slope angle | 1º |
Calibration uncertainty | < 1.2 % (k = 2) |
Calibration traceability | to WRR |
Spectral range (50 % transmission points) | 200 to 4000 x 10⁻⁹ m |
Rated operating temperature range | -40 to 80 °C |
Temperature response | < ± 1% (-10 to +40 °C) |
Temperature response
| < ± 0.4 % (-30 to +50 °C) with correction in data processing, if opted for internal temperature sensor + temperature dependence characterization |
Window assembly with heater
| 12 VDC, 0.5 W |
Standard cable length | 5 m |
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