:: Product Information

SP-420 Smart Pyranometer | USB Output




Applications include shortwave radiation measurement in agricultural, ecological, and hydrological weather networks. Sensors are also used to optimize photovoltaic systems.          


USB Smart Quantum PAR Sensor


The versatile SP-420 can be used two ways - it can be connected directly to a computer for real-time measurements and data logging using the provided software, or it can be connected to a standard USB power source and act as a stand-alone datalogger capable of storing 10,000 periodic measurements internally that can be downloaded to a computer later for analysis.


Internal Data Storage


The sensor has internal data storage capability with the ability to hold up to 10,000 measurements. This allows the sensor to collect data while connected to a stand-alone 5 V DC power supply such as a USB wall adapter.   


No Datalogger Required


The sensor can be connected to a desktop or laptop computer via USB 2.0 type A plug to be used with the ApogeeConnect software (Windows compatible, XP and later; Mac compatible, 10.10 and later). The included Apogee software gives the user control of data logging and calibration settings, provides a real time output display and graph of shortwave radiation measurements and allows the data set to be saved as a csv file.    


Accurate, Stable Measurement


Calibration in controlled laboratory conditions is traceable to the World Radiometric Reference in Davos, Switzerland. Pyranometers are cosine-corrected with directional errors less than ± 5 % at a solar zenith angle of 75°. Long-term non-stablility determined from multiple replicate pyranometes in accelerated aging tests and field conditions is less than 2 % per year.    


Rugged, Self-cleaning Housing


Patented domed shaped sensor head (diffuser and body) facilitate runoff of dew and rain to keep the diffuser clean and mminimize errors caused by dust blocking the radiation path. Sensors are housed in a rugged anodized aluminum body and electronics are fully potted.




Resolution                                              0.1 W m-2

Calibration Factor                                 Custom for each sensor ad stored in firmware

Calibration Uncertainty                         ± 5 %

Measurement Repeatability                  Less than 1 %

Long-term Drift (Non-stability)               Less than 2 % per year

Non-linearity                                            Less than 1 % (up to 1750 W m-2

Response Time                                      Software updates every second

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                                            24 mm diameter, 28 mm height

Mass                                                       Sensor head weighs 90 g

USB Cable                                             4.6 m (15 ft)

Current Draw (when Logging)              2.1 mA

Warranty                                                 4 years against defects in materials and workmanship

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