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Enabling better global research outcomes in soil, plant & environmental monitoring.

Apogee SU-200 Series UV-A

Measure total radiation from 300 to 400 nm

Apogee Instruments’ ultraviolet (UV-A) sensor provides a cost effective measurement of UV-A radiation

Apogee’s SU-200 Series of UV-A Sensor offers a low-cost option for detecting UV radiation from 300 to 400 nm and is calibrated in energy flux units of Watts per square meter. Typical applications include monitoring the filtering ability and stability of various materials, measuring UV-A radiation in outdoor environments and laboratory use, and monitoring UV radiation in horticultural operations environments. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

  • The SU-200 is an unamplified analog sensor with a voltage output.
  • The SU-202 is an amplified UV-A sensor with a 0 to 2.5 V output.
  • The SU-205 is an amplified UV-A sensor with a 0 to 5 V output.
SU-200-SS SU-202-SS SU-205-SS
Power Supply Self-powered 3.3 to 24 V DC 5.5 to 24 V DC
Output (Sensitivity) 0.1 mV per W m-2; 25 mV per W m-2; 50 mV per W m-2;
0.03 mV per µmol m-2 s-1 8.33 mV per µmol m-2 s-1 16.67 mV per µmol m-2 s-1
Calibration Factor (reciprocal of sensitivity) 10 W m-2 per mV; 0.04 W m-2 per mV; 0.02 W m-2 per mV;
30 µmol m-2 s-1 per mV 0.12 µmol m-2 s-1 per mV 0.06 µmol m-2 s-1 per mV
Calibration Uncertainty ± 10 % ± 10 % ± 10 %
Output Range 0 to 10 mV 0 to 2.5 V 0 to 5 V
Measurement Range 0 to 100 W m-2 0 to 100 W m-2 0 to 100 W m-2
Measurement Repeatability Less than 0.5 % Less than 0.5 % Less than 0.5 %
Long-term Drift (Non-stability) Less than 2 % per year Less than 2 % per year Less than 2 % per year
Non-linearity Less than 1 % Less than 1 % Less than 1 %
Response Time Less than 1 ms Less than 1 ms Less than 1 ms
Field of View 180° 180° 180°
Spectral Range 300 to 400 nm 300 to 400 nm 300 to 400 nm
Directional (Cosine) Response ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle
Temperature Response -0.1 % per C -0.1 % per C -0.1 % per C
Operating Environment -35 to 85 C, 0 to 100 % relative humidity -35 to 85 C, 0 to 100 % relative humidity -35 to 85 C, 0 to 100 % relative humidity
Dimensions 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height
Mass (with 5 m of cable) 140 g 140 g 140 g
Warranty 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship