ISO 9060:2018 Class C (previously known as second class) Power Supply 7 to 24 V DC, maximum current draw of 22 mA (2 mA quiescent current draw) Sensitivity 0.008 mA per W mˉ² Calibration Factor 125 W mˉ² per mA (reciprocal of sensitivity) with an offset of 4 mA Calibration Uncertainty ± 5 % Calibrated Output Range 4 to 20 mA 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, maximum radiation measurement is 2000 W mˉ²) Response Time Less than 1 ms 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 ± 0.04 % 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, 33 mm height Cable 5 m of shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions), additional cable available Mass 140 g (with 5 m of lead wire) Warranty 4 years against defects in materials and workmanship