SP-522-SS Modbus Digital Output Thermopile Pyranometer

The SP-522-SS is an upward-looking thermopile pyranometer with a digital signal using Modbus RTU protocol over RS-232 or RS-485. The sensor incorporates a blackbody thermopile detector and acrylic diffuser with a rugged, self-cleaning sensor housing design, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include shortwave radiation measurement in agricultural, ecological, and hydrological weather networks. Sensors are also used to optimize photovoltaic systems. Sensor includes IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement for maintenance and recalibration.

Specification

• ISO 9060:2018 Class C (first response)
• Input Voltage Requirement 5.5 to 24 V
• Average Max Current Draw 4 mA (heater off); 30 mA (heater on)
• Calibration Uncertainty at 1000 W mˉ² Less than 3 %
• Measurement Repeatability Less than 1 %
• Long-term Drift (Non-stability) Less than 2 % per year
• Non-linearity Less than 1 % (up to 2000 W mˉ²)
• Detector Response Time 0.5 s (baudrate dependant)
• Field of View 180˚
• Spectral Range 385 to 2105 nm (wavelengths where response is 50 % of maximum)
• Directional (Cosine) Response Less than 30 W mˉ² at 80˚ solar zenith
• Temperature Response Less than 5 % from -15 to 45 C
• Zero Offset A Less than 5 W mˉ²; Less than 10 W mˉ² (heated)
• Zero Offset B Less than 5 W mˉ²
• Operating Environment -50 to 80 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m
• Dimensions 30.5 mm diameter, 37 mm height
• Mass (with 5 m of cable) 140 g
• Cable 5 m of two conductor, shielded, twisted-pair wire, additional cable available in multiples of 5 m; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires
• Warranty: 4 years against defects in materials and workmanship
• Manufactured: Assembled in the USA