RS485 4-20mA Weather Station Solar Radiation Pyranometer Sensor

Wire-wound electroplating thermopile with high-absorptivity black coating measures solar radiation spectrum from 0.3 to 3um, far exceeding the narrow range of photoelectric silicon-cell alternatives.

Transparent double-layer glass cover achieves 95% light transmittance, suppressing air convection effects on the sensing element while blocking dome self-radiation from contaminating readings.

Integrated drying cartridge filled with desiccant maintains dry air inside the glass dome, preventing condensation on the inner dome surface that would scatter light and degrade measurement accuracy.

Tilt error held within 2%, allowing installation on slightly inclined surfaces without meaningful accuracy loss compared to strictly horizontal mounting, useful on angled rooftop or tracker surfaces.

Near-standard cosine response across full hemisphere captures low-angle morning and evening radiation accurately, reducing underestimation of daily total irradiance with poor angular response.

Zero drift below 6W/m2 prevents false baseline offset at dawn, dusk, and overcast conditions, enabling accurate daily energy integration without manual zero correction between readings.

Device is designed for formal re-calibration at 2-year intervals by the manufacturer, supporting traceability requirements for scientific and LEED-certified applications.

RS485 variant draws only 0.2W across a 10 to 30VDC input, enabling solar or battery-powered off-grid installation at remote agricultural stations and photovoltaic monitoring sites.

Integrated bubble level and adjustable leveling screws allow precise horizontal alignment without a separate leveling base, simplifying installation at uneven surfaces or custom mounting brackets.

Dual specification of under 3% annual drift and under 3% non-linearity ensures consistent, proportional irradiance output across the full 0 to 2000W/m2 range year over year.