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DR30-D1 pyrheliometer

DR30-D1 pyrheliometer
4Pages

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Thermal Sensors Next level digital first class pyrheliometer, with heating and tilt sensor DR30 is a high-accuracy digital direct (normal incidence) solar radiation sensor. The scientific name of this instrument is pyrheliometer. DR30 complies with the first class specifications of the ISO 9060 standard and the WMO Guide. This next level pyrheliometer has superior window heating that leads to high data availability, and an internal tilt sensor to check tracker performance. Introduction Welcome to the next level in solar radiation monitoring! The all-digital DR30-D1 pyrheliometer offers the highest accuracy and highest data availability, featuring window heating at low offsets. At the same heating power, the heating has been improved with a factor 4, at a 4 times lower offset! DR30 also offers on-board tilt and humidity sensors. It 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). It is necessary to keep the instrument pointed at the sun by using a two-axis tracker. Heated for high data availability Figure 1 DR30-D1 next level digital pyrheliometer, with heating and tilt sensor High data availability is attained by heating of the front window. This suppresses dew and frost deposition. • low power consumption: DR30 needs only 2 W to keep its window free from dew and frost Remote sensor diagnostics In addition to solar irradiance, DR30 outputs sensor diagnostics such as: • • • tilt angle internal humidity heater current Remote diagnostics permits real-time status monitoring, reducing the need for (un)scheduled field inspections. Liabilities covered: test certificates Figure 2 the importance of heating: tracker-mounted operation of DR30 pyrheliometer (on the right) compared to a non-heated instrument (on the left). The data availability of the non-heated instrument suffers in almost all environments due to morning dew, rime and frost. Each DR30 next level digital pyrheliometer is supplied with test results for the individual instrument: • • • • sensitivity response time temperature response tilt angle measurement Copyright by Hukseflux. Version 2203. We reserve the right to change specifications without prior notice Page 1/4. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us:

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Thermal Sensors DR30 pyrheliometer is used in tracker-mounted operation. DR30 can be connected directly to commonly used data logging systems. It offers a digital output via Modbus RTU over 2-wire RS-485. Measurand ISO classification Calibration uncertainty Measurand Tilt measurement uncertainty Heating Response time (95 %) Full field of view angle Slope angle Power consumption - standard operating mode - low power operating mode Zero offset Calibration traceability Spectral range Rated operating temperature range Temperature response Temperature response test of individual instrument Tilt...

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Thermal Sensors DR30 user benefits Using DR30 digital pyrheliometer offers significant benefits over the use of competing models. The alldigital DR30 pyrheliometer offers the highest accuracy and highest data availability, featuring heating at low offsets, and on-board tilt and humidity sensors. The advantages of having a heater and a tilt sensor are demonstrated in the following graphs: steady state offset [W/m²] Figure 6 the offset of DR30 when heating is much improved relative to the older DR01, DR02 and DR03 models. DR30 has a 1.5 W heater and produces a negligible offset. The older...

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Thermal Sensors theoretical zenith angle power restored twilight Figure 8 example of use of the DR30 tilt sensor for tracker performance monitoring: the red line is the output of the DR30 tilt sensor, the blue line the theoretical zenith angle. There is a power failure before 13:00, at that time power is restored. Tracking between 13:00 and 15:00 is under cloudy conditions, based on GPS information only and slightly off. Tracking from 15:00 onwards is under sunny conditions and based on the tracker’s sun sensor. The tracker moves to its rest position shortly after 17:00. Real measured data...

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DR30-D1 pyrheliometer 4Pages

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DR30-D1 pyrheliometer
4Pages