SP-422-SS Modbus Digital Output Silicon-cell Pyranometer

The SP-422-SS sensor outputs a digital signal using Modbus RTU protocol over RS-232 or RS-485. The sensor incorporates a silicon-cell photodiode 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 (fast response)
• Input Voltage Requirement: 5.5 to 24 V
• Average Max Current Draw: RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA
• 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)
• Response Time: Less than 200 ms
• Field of View: 180˚
• Spectral Range: 360 to 1120 nm (wavelengths where response is 10 % of maximum)
• Directional (Cosine): Response ± 5 % at 75˚ zenith angle
• Temperature Response: 0.04 ± 0.4 % per C
• Operating Environment: -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 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