Pyrheliometer DR30-D1

Overview
The DR30 is an industrial-grade Class A pyrheliometer designed for high-accuracy measurement of Direct Normal Irradiance (DNI) in photovoltaic systems, solar resource assessment, and meteorological applications. This all-digital sensor combines exceptional measurement accuracy with superior window heating, integrated tilt sensing, and advanced diagnostics to deliver the highest data availability in demanding outdoor environments. Designed for operation on a two-axis solar tracker, the DR30 provides reliable direct solar radiation measurements in all climatic conditions.

Key features
• Class A performance: fully compliant with ISO 9060 Class A specifications and WMO recommendations for high-accuracy direct solar radiation measurements.
• Measures Direct Normal Irradiance (DNI) with a 5° full field of view.
• Low-power heating system: requires only 2 W to keep the window free from dew and frost.
• Built-in tilt sensor: continuously measures sensor tilt and rotation, supporting tracker applications.
• Advanced diagnostics: includes status LED and remote diagnostics such as heater current, tilt angle, and internal humidity.
• Supplied with individual test reports including sensitivity, response time, temperature response, and tilt angle measurement.

Applications
• Direct Normal Irradiance (DNI) monitoring for photovoltaic (PV) performance monitoring systems
• Solar resource assessment and meteorological monitoring networks.
• High-accuracy solar radiation monitoring in locations affected by dew and frost


Specifications
• Measurand: Direct Normal Irradiance (DNI) [W/m²]
• Sensor classification: ISO 9060 Class A pyrheliometer
• Calibration uncertainty: < ±1.2%
• Field of view: 5°
• Response time (95%): 4 s
• Spectral range: 200 to 4000 nm
• Tilt measurement uncertainty: ±1° (0 to 180°)
• Power consumption: 2 W in standard operating mode, 0.1 W in low power operating mode
• Operating temperature range: -40 °C to +80 °C
• Temperature response (-30 °C to +50 °C): < ±0.4%
• Communication protocol: Modbus RTU
• Hardware interface: 2-wire RS-485
• Electrical operating voltage: 7 to 30 VDC
• Standard cable length: 5 m

Cable length options
• 5 m
• 10 m
• 20 m