Specifications
RA01
| Measurand | downward longwave radiation*, global solar radiation |
| Optional measurand | sky temperature*, solar duration |
| Included sensors | 1 x ISO 9060 spectrally flat Class C pyranometer 1 x pyrgeometer with 150 ° field of view angle |
| Calibration traceability solar | to WRR |
| Spectral range solar | 285 to 3000 x 10⁻⁹ m |
| Calibration traceability longwave | to WISG |
| Spectral range longwave | 4.5 to 42 x 10⁻⁶ m |
| Required readout | 2 x DC voltage 1x Pt100 |
| Rated operating temperature range | -40 to +80 °C |
| Temperature sensor | Pt100 |
| Measurand Pt100 | instrument body temperature |
| Heater on pyrgeometer | 1.5 W at 12 VDC |
| Levelling | 2-axis levelling assembly (included) |
| Mounting | on a 1 inch NPS tube; RA01 delivery includes a shim for easy alternative mounting on a ¾ inch tube (tubes not included) |
| Standard cable length | 2 x 5 m (see options) |
| * Required measurand | instrument body temperature |
Options
- longer cable, in multiples of 5 m, cable lengths above 20 m in multiples of 10 m
- upgrade to NR01 net radiometer
RA01 2-component radiometer
RA01 radiometer measures 2 separate components of the surface radiation balance: solar and longwave radiation. The solar radiation sensor is called pyranometer and the longwave sensor is called pyrgeometer. For calculation of sky temperature, a Pt100 temperature sensor is included in the pyrgeometer. To prevent deposition of dew, the pyrgeometer has internal heating. A 2-axis levelling assembly is included.
RA01 Operation
Using RA01 radiometer is easy. It can be connected directly to commonly used data logging systems. The irradiance levels in W/m² are calculated by dividing the RA01 outputs, small voltages, by the sensitivities. The longwave irradiance should be corrected using the instrument body temperature. The sensitivities of all sensors are provided with RA01 on its product certificate. RA01 radiometers are often used in scientific-grade energy balance and surface flux studies.
RA01 radiometer design
RA01 radiometer has a modular design: it is possible to take the instrument apart and replace or re-calibrate individual sensors. A 2-axis levelling assembly is included. The levelling assembly fits a 1 inch NPS tube (the tube’s recommended outer diameter equals 33.4 x 10⁻³ m). With the RA01 shim, included in RA01’s delivery, a ¾ inch NPS tube may also be used.
Suggested use
- energy balance studies
- surface flux measurements
- climatological networks
Areas of Application
RA01 radiometer
- modular design, low weight and easy levelling
- low solar offsets in the longwave measurement
- unique capability to heat the pyrgeometer reducing measurement errors caused by dew
