Specifications
DR15-A1
| Measurand | direct solar radiation |
| ISO classification | spectrally flat Class B |
| Calibration uncertainty | < 1.2 % (k = 2) |
| Heating | included |
| Heater | 1 W at 12 VDC |
| Response time (95 %) | 4 s |
| Full field of view angle | 5 ° |
| Slope angle | 1 ° |
| Zero offset a (5K/hr) | < ± 1 W/m² |
| Calibration traceability | to WRR |
| Spectral range | 200 to 4000 x 10⁻⁹ m |
| Rated operating temperature range | -40 to +80 °C |
| Temperature response | < ± 1 % (-10 to +40 °C) |
| Calibration certificate | included |
| Temperature response test of individual instrument | no report included for DR15. See DR20 pyrheliometer |
| Cable length | 5 m |
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DR15 pyrheliometers are applied in high-accuracy measurements 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). It is necessary to keep the instrument pointed at the sun by using a two-axis tracker.
The pyrheliometer features a precision ground and polished quartz window, a compact sized collimated tube and a thermopile sensor with black coated surface. DR15-A1 offers analogue output in millivolts. It can be connected directly to commonly used data logging systems. High data availability is attained by heating of the front window. This suppresses dew and frost deposition at a very low power consumption: DR15 needs only 1 W to keep its window free from dew and frost.
DR15 complies with the Class B specifications of the ISO 9060:2018 standard. Each DR15 pyrheliometer is supplied with test results for the individual instrument:
- sensitivity
- response time
Each DR20 pyrheliometer also includes a test report on temperature response, as required by ISO 9060 for Class A classification.
Suggested use
- solar energy surveys
- solar resource assesments
- meteorological networks
- sites with dew and frost problems
DR15-A1 pyrheliometer
- ISO 9060 spectrally flat Class B
- Heating at low offsets for high data availability
- Low power consumption
- Analogue millivolt output
- Supplied with test report for the individual instrument
