DR02-FR Fast Response Pyrheliometer Applications Climatology/Meteorology Material Testing Research Solar Collector & PV Panel Efficiency Validation Solar Renewable Resource Assessment Note: Above applications are inclusive of, but not limited to the entire DR02-FR application range.
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The DR02-FR Fast Response Pyrheliometer is the fastest response 'First Class' pyrheliometer on the market. Due to cutting edge advances in thermopile sensing technology, the DR02-FR achieves a blistering 99% response time of just 1 second. Comparable in response time to photodiode based radiometers, the DR02-FR possesses all the spectral and thermal performance benefits of a conventional high performance ISO Class thermopile pyrheliometer. Intended for tracker mounted operation, the DR02-FR is ideal for high accuracy short-wave direct solar irradiance measurement research requiring rapid response.

The DR02-FR foreoptic assembly features a precision ground and polished quartz window/lens, for true spectral solar transmission from 0.2 - 4.0 µm. As per the latest ISO-9060 and WMO standards, the full opening view angle of the DR02-FR is collimated precisely to 5.0° degrees, making the instrument ideally suited for normal incidence direct solar irradiance measurement. Applicable for shortwave normal incidence irradiance measurement up to two suns, 2000 W/m², the DR02-FR pyrheliometer is intended for field deployment anywhere on Earth. The instrument employs a passive state-of-the-art high speed thermopile detector which generates a DC millivolt output signal proportional to the normal incident direct solar flux received at the detector surface. The DR02-FR also features a thermally isolated low power window/lens heater in the foreoptic. When cycled on/off prior to sunrise, the window heater effectively eliminates the formation of dew on the pyrheliometer window/lens, resulting in improved post sunrise early morning measurement accuracy. Determining direct solar disk irradiance with the DR02-FR requires connection to a data acquisition device with a measurement resolution of ten micro-volts or better, and an autonomous two-axis solar tracker platform. Typical DR02-FR measurement applications include scientific meteorological/climate observations, material testing research, solar collector/PV panel efficiency and solar renewable resource assessment validation.

DR02-FR Specifications ISO classification: First Class Spectral range: 200 to 4000nm Sensitivity (nominal): 15µV/W/m2 Response time: 0.2 sec. (1/e signal) 1 sec. (99%) Range: 0 to 2000 W/m2 Full opening view angle: 5.0° degrees Slope angle: 1.0° degree Non-linearity (to 1000 W/m2): ± 1% Temperature range: -40 to +80° C Temperature dependence: < ± 0.1%/°C Non stability (drift): < ± 1% per year Calibration traceability: WRR Cable length: 5 meter standard (longer lengths optional) Options Additional cable length by the meter, AC100 / AC420 amplifiers.

The signal cable of the DR02-FR can be easily replaced by the user onsite, thus minimizing down-time and expense otherwise associated with instrument re-cabling and/or cable connector replacement by the manufacturer. Each DR02-FR pyrheliometer is calibrated upon manufacture and delivered standard with a WRR (World Radiometric Reference) traceable certificate of calibration.