Geonica - Model GEO-DR01 - First Class Pyrheliometer
The GEO-DR01 is a research grade normal incidence direct solar irradiance sensor (also known as a pyrheliometer). Suitable for tracker mounted operation, the GEO-DR01 is intended for short-wave direct solar irradiance measurement of the sun. The GEO-DR01 is a 'First Class' compliant pyrheliometer, as per the latest ISO and WMO standards.
The GEO-DR01 foreoptic assembly features a precision ground and polished quartz window/lens, for true spectral solar transmission ranging from 0.2 - 4.0 pm. As per the latest ISO-9060 and WMO standards, the full opening view angle of the DR01 is collimated precisely to 5.0° degrees, making the sensor ideally suited for normal incidence direct solar irradiance measurement.
Capable of measuring up to four suns, 4000 W/m2, the GEO-DR01 pyrheliometer can be deployed anywhere on earth. The instrument employs a passive thermopile-based sensing technology that generates a low level DC millivolt output signal proportional to the normal incident direct solar flux received at the detector surface. The DR01 also features a thermally isolated low power window/lens heater in the foreoptic; when cycled on/off prior to sunrise the heater effectively eliminates the formation of dew on the pyrheliometer window /lens, thus resulting in improved post sunrise early morning measurement accuracy.
Determining direct solar irradiance with the DR01 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 DR01 measurement applications include scientific meteorological/climate observations, material testing research, solar collector/PV panel efficiency and solar renewable resource assessment. Each DR01 is calibrated upon manufacture and delivered standard with a WRR (World Radiometric Reference) traceable certificate of calibration.
- climatology / meteorology
- material testing research
- solar collector and PV panel efficiency validation
- solar renewable resource assessment
- ISO classification : First Class
- Spectral range : 200 to 4000 nm
- Response time : 18 s (95% response time)
- Resolution : Analogue output, so the resolution depends on the data acquisition only. For METEODATA, the resolution is 0.1 W/m2 or better.
- Non-Linearity : < ±0.3%
- Full opening view angle : 5 degrees
- Slope angle : 1 degree
- Irradiance range : 0 to 4000 W/m2
- Sensitivity (nominal) : 10 pV/ W/m2
- Temperature range : -40° to +80° C
- Temperature dependence : < 0.1%/°C
- Relative Humidity range : 0-100%
- Non stability (drift) : < ±1 per year (full scale)
- Output signal : Analogue voltage 0 to 30 mV
- Calibration traceability : WRR
- Impendance : 400 to 500 Ohm
- Cable length : 5m standard (longer lengths optional)
- Window Heating 0.5 W @ 12VDC