Sensor Calibration
All Apogee amplified UV sensor models SU-202 and SU-205 have a standard UV calibration factor of exactly:
SU-202: 0.04 W m
-2
per mV
SU-205: 0.02 W m
-2
per mV
The following example uses the SU-202 calibration factor and expected response under full sunlight:
Calibration Factor (0.04 W m
-2
per mV) * Sensor Output Signal (mV) = UV-A (W m
-2
)
0.04 *
1500
= 60
Example of UV-A measurement with an Apogee SU-202
sensor. Full sunlight yields UV-A radiation on a horizontal
plane at the Earth’s surface of approximately 60 W m
-2
. This
yields an output signal of 1500 mV. The signal is converted to
UV-A radiation by multiplying by the calibration factor of 0.04
W m
-2
per mV.
Sensor Output
1500 mV
Full Sunlight
60 W m
-2
UV-A
