The SP-421 is a digital sensor with SDI-12 communication protocol. 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.
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Current Stock:
ISO 9060:2018
Class C (fast response)
Input Voltage Requirement
5.5 to 24 V DC
Current Drain
1.5 mA (quiescent), 1.9 mA (active)
Output Range
0 to 2000 W mˉ²
Calibration Uncertainty at 1000 W mˉ²
Less than 3%
Measurement Repeatability
Less than 1 %
Non-stability (Long-term Drift)
Less than 2 % per year
Non-linearity
Less than 1 % (up to 2000 W mˉ²)
Response Time
0.6 s, time for detector signal to reach 95 % following a step change, fastest data transmission rate for SDI-12 circuitry is 1 s
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
