Compact fast response first class pyrheliometer
DR03 is a high-accuracy direct (normal incidence) solar radiation sensor with a short response time and a relatively small size. The scientific name of this instrument is pyrheliometer. DR03 complies with the first class specifications of the ISO 9060 standard and the WMO Guide. Its fast response time makes DR03 very suitable for PV-related applications. This pyrheliometer has a heated window and is used in tracker-mounted operation. DR03’s compact size improves compatibility with small-sized trackers.
DR03 is a solar radiation sensor that is applied in high accuracy measurement of the solar radiation received by a plane surface from a 5 ° full field of view angle. This quantity, expressed in W/m2, is called “direct” solar radiation or DNI (direct normal irradiance). Pyrheliometers like DR03 are generally employed outdoors under the sun. It is necessary to keep the instrument pointed at the sun by using a two-axis tracker. Due to its short response time, DR03 is ideally suited for concentrated PV or concentrated thermal applications, where it will match the response time of the panel or receiver. Typical DR03 applications include solar energy resource assessment and system performance monitoring (in particular for concentrated solar energy), scientific solar climate observations and outdoor materialtesting.
Benefits and operation
Besides its short response time, DR03 offers two more distinguishing features with benefits:
- DR03 window assembly is equipped with a heater which reduces measurement errors caused by (early-morning) dew deposition
- its compact size improves compatibility with small sized trackers
DR03 can be connected directly to commonly used data logging systems. The irradiance in W/m2 is calculated by dividing the instrument output, a small voltage, by the sensitivity. This sensitivity is provided with DR03 on its product certificate. DR03 pyrheliometer is optionally equipped with a temperature sensor and is optionally characterised for its temperature dependence. This can be used to increase the accuracy of the measurement.
DR03 pyrheliometer design
The pyrheliometer features a precision ground and polished quartz window, a compact sized collimated tube and a thermopile sensor with black coated surface. DR03 also features a thermally isolated low power heater in the window assembly.
- with small size trackers
- outdoor PV / CPV and CSP system performance monitoring
- solar energy surveys
- solar resource assessments
- meteorological networks
- longer cable, in multiples of 5 m, cable lengths above 20 m in multiples of 10 m
- internal temperature sensor
- temperature dependence characterisation
- various tracking solutions can be offered by Hukseflux
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- direct solar radiation
- ISO classification
- first class pyrheliometer
- Response time (95 %)
- 2 s (nominal)
- Full field of view angle
- 5 °
- Slope angle
- 1 °
- Total sensor length including cap
- 286 x 10-3 m
- Calibration uncertainty
- < 1.2 % (k = 2)
- Measurement range
- 0 to 4000 W/m2
- Spectral range
(50 % transmission points)
- 200 to 4000 x 10-9 m
- Sensitivity (nominal)
- 10 x 10-6 V/(W/m2)
- 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 characterisation (see options))
- Window assembly with heater
- 12 VDC, 0.5 W
- Standard cable length
- 5 m (see options)