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Original factory packaging
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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual
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.
| 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 | Made in the USA |
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