Pyrheliometer DR15-A1

Overview
The DR15-A1 is an analog industrial-grade Class B pyrheliometer designed for high-accuracy measurement of Direct Normal Irradiance (DNI) in photovoltaic systems, solar resource assessment, and meteorological applications. Designed for operation on a two-axis solar tracker, the DR15-A1 includes front-window heating to minimize dew and frost and provides analog millivolt outputs for direct integration with data acquisition systems.

Key features
• Class B performance: fully compliant with ISO 9060 Class B specifications.
• Measures Direct Normal Irradiance (DNI) with a 5° full field of view.
• Low-power heating system: requires only 1 W to keep the window free from dew and frost (4x increase in heating at same heating power compared to older models).
• Analog output for seamless integration with a wide range of data acquisition systems.
• Supplied with individual test reports including sensitivity, and response time.

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 with heater on: 1W
• Operating temperature range: -40 °C to +80 °C
• Temperature response (-10 °C to +40 °C): < ±1%
• Standard cable length: 5 m

Cable length options
• 5 m