SP-421-SS SDI-12 Digital Output Silicon-cell Pyranometer

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. Typical applications include sh

  • Product Name:SP-421-SS SDI-12 Digital Output Silicon-cell Pyranometer
  • Item No.:SP-421-SS
  • Manufacturers:Apogee
  • Country of Origin:USA

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. 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 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

ISO 9060:2018:     Class C (previously known as second class)

Input Voltage Requirement:     5.5 to 24 V DC

Current Drain:     1.3 mA (quiescent), 1.8 mA (active)

Output Range:     0 to 2000 W mˉ²

Calibration Uncertainty:     ± 5 %

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