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Comparison Of Solar Radiation Sensors

Various solar radiation sensors are available with the modular Capricorn FLX Weather Station and/or with the Weather MicroServer for all weather station models. Additionally, the Magellan MX and Pulsar Weather Stations offer all-in-one sensor modules with integrated solar radiation measurement.

ISO classifications “secondary standard,” “first class,” and “second class” correspond to the World Meteorological Organization categories “High quality,” “Good quality,” and “Moderate quality.”

Silicone-based Pyranometer This sensor is calibrated to measure the shortwave radiation reaching the Earth’s surface, measured in Watts per square meter. Silicon pyranometers are generally less expensive than thermopile sensors, yet often sufficient for many requirements.

Advantages:

– Low cost – Sensor head is potted solid to prevent internal condensation in humid environments – Self-cleaning dome-shaped head prevents water accumulation Applications: General purpose solar monitoring.

Specifications:

ISO classification: None Cosine Response: 45° zenith angle ± 1%, 75° zenith angle ± 5% Absolute Accuracy: ± 5% Uniformity: ± 3% Repeatability: ± 1% Output Responsivity: 0.200 mV per W/m² Linear Range: 0 - 350 mV (0 - 1,750 W/m²) Sensitivity: Custom calibrated to exactly 0.5 W/m² per mV Input Power: 5 volts DC Operating Environment: - 40 to 55 °C; 0 to 100% relative humidity. Designed for continuous outdoor use Materials: Anodized aluminum with acrylic lens Dimensions: 2.4 cm diameter, 2.75 cm high

Second Class Pyranometer

Thermopile-based Pyranometer: Second Class This thermopile sensor meets ISO 9060 Second Class requirements. It measures solar radiation received by a plane surface, in W/m², from a 180° field of view angle.

Advantages:

Easy mounting and installation Applications: Ideal for general solar radiation measurements in meteorological networks and photovoltaic monitoring.

Specifications:

ISO classification: ISO 9060 Second Class Spectral range: 280 to 3000 nm Calibration Uncertainty: < 1.8% (k=2) Operating Temperature Range: -40 to +80°C Output: 0 to 1VDC

First Class Pyranometer

Thermopile-based Pyranometer: First Class This thermopile sensor meets ISO 9060:1990 First Class requirements and features a sixty-four thermocouple junction (series connected) sensing element. The sensing element is coated with a highly stable carbon based non-organic coating, which delivers excellent spectral absorption and long term stability characteristics. It has improved performance due to the increased thermal mass and the double glass dome construction.

Advantages:

Accurate solar radiation measurements Durable Applications: Operations that require accurate data for photovoltaic power.

Specifications:

ISO classification: ISO 9060:1990 First Class Spectral range (20% point): 280 to 3000 nm Spectral range (50% point): 285 to 2800 nm Response time (63%):