The SR20-D2, manufactured by Hukseflux Thermal Sensors, is an ISO 9060:2018 spectrally flat Class A (secondary standard) digital pyranometer that measures solar short-wave radiation in a full hemisphere of the sky. It connects directly to a Campbell Scientific data logger and is designed for Modbus RTU applications that require high measurement accuracy in demanding applications such as scientific meteorological observation networks and utility scale solar-energy-power production sites.
Sensor | HIgh-quality blackened thermopile protected by two glass domes |
Measurement Description | Monitors solar radiation for the full solar spectrum range |
ISO Classification | Spectrally flat Class A (secondary standard) pyranometer (ISO 9060:2018 ) |
WMO Performance Level | High-quality pyranometer |
Response Time | 4.5 s |
Zero Offset A |
5 W/m2 (unventilated), 2.5 W/m2 (ventilated) (response to 200 W/m2 net thermal radiation) |
Zero Offset B | ≤ ± 2 W/m2 (response to 5 K/h change in ambient temperature) |
Non-Stability | ≤ ± 0.5% change per year |
Non-Linearity | ≤ ± 0.2% (100 to 1000 W/m2) |
Directional Response | < ± 10 W/m2 |
Spectral Selectivity | < ± 3% (0.35 to 1.5 x 10-6 m) |
Temperature Response | < ± 0.4% (-30° to +50°C) |
Tilt Response | < ± 0.2% (0 to 90° at 1000 W/m2) |
Heater | No heater available |
Steady-state Zero Offset |
|
Calibration Uncertainty | < 1.2% (k=2) |
Level Accuracy | < 0.1° (bubble entirely in ring) |
Operating Temperature Range | -40° to +80°C |
Field of View (FOV) | 180° |
Measurement Range | -400 to 4000 W/m2 |
Spectral Range | 285 to 3000 x 10-9 m (20% transmission points) |
Sensitivity | Digital output |
Output Definition | Running average over 4 measurements (refreshed every 0.1 s) |
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Compatible with all data loggers that support Modbus.
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