Description

Total Solar Irradiance Sensor - RS485

The SN-300AL-RA-N01 is a total solar radiation sensor designed to measure overall solar irradiance across a broad spectral range of approximately 0.3 µm to 3 µm (300–3000 nm), representing the total solar energy incident on the sensor. It employs a high-precision photoelectric sensing element and communicates via an RS-485 interface using the Modbus-RTU protocol. Durable, dust-resistant optical components ensure long-term stability and accuracy, while the RS-485/Modbus-RTU interface enables reliable, real-time data acquisition for environmental and solar energy applications.

Quick Spec

Manufacturer Part No: SN-300AL-RA-N01 (also referred to as PR-300AL-RA-N01)
Power Supply: 7–30V DC
Spectral Range: 0.3–3 µm (300–3000 nm)
Measurement Range: 0–1800 W/m²
Resolution: 1 W/m²
Response Time: ≤ 10 s
Non-linearity: ±2 %
Annual Stability: ≤ ±2 %
Cosine Response Error: ≤ ±10 %
Power Consumption:0.06 W
Operating Humidity: 0–100 %RH
Operating Temperature: −25 °C to +60 °C
Equipped with a built-in leveling bubble and adjustment knob for easy on-site alignment
Output: RS485 (ModBus-RTU protocol) - Supports standard Modbus-RTU protocol

Typical use

Solar energy measurement - It measures all incoming solar energy over a broad spectrum
Meteorology - high-level meteorological analysis
Building or material aging studies
General environmental solar monitoring

Wire Connections

Brown: Power + (7–30 V DC)
Black: Power – (Ground)
Yellow (or Green): RS-485 A
Blue: RS-485 B

What SN-300AL-RA-N01 sensor can detect

Near-UV (from ~300 nm upward)
Visible light (400–700 nm)
Near-infrared (NIR)
Short-wave infrared (SWIR)

What is important

This range accounts for the vast majority of solar energy that reaches the ground, which is why sensors like this are used as pyranometer-type total solar radiation sensors.