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

Make:  Apogee     Model:  SP-421
✅ The SP-421 is a digital sensor with SDI-12 communication protocol.
✅ Measurand : Shortwave Radiation.
✅ Sensor Type : Silicon-cell Photodiode.
✅ Standards & Classifications : ISO 9060:2018 Class C.
✅ Signal Output : Digital Output ( SDI 12).
✅ Supplied With : 5 m cable, Calibration Certificate/Factory Test.

  • SKU: Apogee-SP-421-SS
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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.

Details & Specifications

Make Apogee
Model SP-421-SS
General Specifications :-
Weight (Mass) 140 g (with 5 m of cable)
Dimension 30.5 mm diameter, 37 mm height
Output SDI-12
Power supply 5.5 T0 24 V DC
Classification ISO 9060:2018: Class C (fast response)
Long-term instability Less than 2 % per year
Non-linearity Less than 1 % up to 2000 W m⁻²
Operating conditions -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m
Spectral range 360 to 1120 nm
Temperature Response 0.04 ± 0.04 % per C
Response time (95%) Less than 0.6 s
Protection Level IP68
Cable length 5 m of shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires

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