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

Updated:2025-03-13

Brand: APOGEE
Model: SP-422-SS
Description: 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
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Product Details

Overview of SP-422-SS Modbus Digital Output Silicon cell solar Radiation Intensity meter：

User's Manual

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.

SP-422-SS Modbus drawing：

SP-422-SS Specifications of Modbus:

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	Made in the USA