CS320 CAMPBELL | Alldatasheet
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AR@ES CAMPBELL = ) SCIENTIFIC CS320 Digital Thermopile Pyranometer CAMPBELL SCIENTIFIC Overview The CS320 is a digital thermopile pyranometer that measures broad-spectrum short-wave radiation and communicates over the simple SDI-12 protocol to the data logger. This sensor design eliminates measurement error and programming errors that can adversely affect data quality. This pyranometer has been designed to improve the global solar radiation measurement significantly (even under cloudy conditions) without adding substantial cost. The Benefits and Features ) Thermopile sensor eliminates spectral errors associated with silicon-cell pyranometers ) Much lower price point than other thermopile sensors ) On-board sensor automatically detects if the C5320 is level for installation, diagnostics, and remote troubleshooting ) Designed for long-term stability and deployment ) Dome-shape sensor head allows dew and rain runoff Technical Description The C5320 combines a blackbody thermopile detector with an acrylic diffuser. This design is a significant improvement when compared with the spectral response of silicon photocell pyranometers, while offering a comparable price. Thermopile pyranometers use a series of thermoelectric junctions (multiple junctions of two dissimilar metals following the thermocouple principle) to provide a signal of several pV/W/m? proportional to the temperature difference Thermopile Accuracy, Digital Simplicity, Affordable Price For measurement of global solar radiation under changing weather conditions (S320is suitable for applications ranging from environmental research to agriculture to large mesoscale weather networks (mesonets). The CS320 is manufactured using a high-grade anodized aluminum body and IP68-rated 316 stainless-steel M8 connector (marine grade). The C5320 sensor is heated (on/ off switchable under user control) and allows continuous operation in changing environmental conditions. The pyranometer's calibration data is stored on the sensor. ) Internal heater to reduce errors from dew, frost, rain, and snow ) SDI-12 digital output ) Detachable waterproof connector from sensor head for fast, easy servicing ) Calibration data stored on sensor between a black absorbing surface and a reference. The thermopile pyranometer's black surface uniformly absorbs solar radiation across the solar spectrum. The 0.2 W heater keeps water (liquid and frozen) off the sensor to minimize errors caused by dew, frost, rain, and snow blocking the radiation path. Dew and rain runoff is faciliated by the dome-shaped sensor head (diffuser and For comprehensive details, visit: www.campbellsci.eu/cs320
body). This keeps the sensor clean and minimizes errors caused by dust blocking the radiation path. The sensor is housed in a rugged anodize aluminum body, and the electronics are fully potted. The CS320 pyranometer has sensor-specific calibration coefficients determined during the custom calibration Specifications Sensor Thermopile detector, acrylic diffuser, heater, and signal processing circuitry mounted in an aluminum housing Measurement Description Measures broad-spectrum short- wave radiation 15O Classification Class C (second class) Calibration Uncertainty +26% Measurement Range 0t0 2000 W/m? (net short-wave irradiance) Measurement Repeatability < 1% Long-Term Drift < 2% (per year) Non-Linearity <1% Sensitivity 0057 mV/W/m? Detector Type Blackbody thermopile SDI-12 Response Time 2s Field of View (FOV) 180° Spectral Range 385 to 2105 nm (50% points) Directional (Cosine) Response <+20 W/m? (at 80° solar zenith) Temperature Response < 5% (from -15° to +45°C) Output SDI-12 (version 1.4) 1200 bps Zero Offset A 8W/m?2 Zero Offset B <5W/m? process. Coefficients are programmed into the microcontrollers at the factory. The CS320 has an SDI-12 output (SDI-12 version 14), where short-wave radiation (W/ m?) is returned in digital format. Measurement of the C5320 pyranometer requires a measurement device with SDI-12 functionality that includes the M or C command. Operating Temperature Range -50°to +60°C Operating Environment 0 to 100% relative humidity Heater 0.2 W (on-board) Heater Power Requirements25 mA current drain (at 12 Vdc) Input Voltage Requirements6 to 24 Vdc 3 mA (standby) 5 mA (measurement) Uncertainty in Daily Total < 5% Current Drain Error Due to Clouds +2% Mechanical Rating IP66/68 Factory Calibrations Traceable to secondary standard blackbody thermopile pyranometers traceable to the world radiation reference in Davos, Switzerland. Compliance with Standards } 2011/65/EU RoHS Directive 2015/863/EU RoHS Phthalates Amendment Warranty 4 years against defects in materials and workmanship Diameter 343cm (1351in) Height 396.cm (156in) Weight ~659(2.302) May vary due to potting. For comprehensive details, visit: www.campbellsci.eu/cs320 CAMPBELL 80 Hathern Road, Shepshed, LE12 9GX UK | +(0)1509 828888 | sale@campbellsci.couk | www.campbellsci.eu SCIENTIFIC AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | INDIA | SOUTH AFRICA | SPAIN | THAILAND | UK | USA ©2021 Campbell Scientific, Ltd. | 04/29/2021