• Input Voltage Requirement 5.5 to 24 V DC
• Current Draw 1.4 mA (quiescent), 1.8 mA (active)
• Calibration Uncertainty ± 5 %
• Measurement Repeatability Less than 1 % (up to 4000 µmol mˉ² sˉ¹)
• Non-stability (Long-term Drift) Less than 2 % per year
• Non-linearity Less than 1% (up to 4000 µmol mˉ² sˉ ¹)
• Response Time 0.6 s, time for detector signal to reach 95 % following a step change, fastest data transmission rate for SDI-12 circuitry is 1 s
• Field of View 180˚
• Spectral Range 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum)
• Spectral Selectivity Less than 10 % from 412 to 682 nm ± 5 nm
• Directional (Cosine) Response ± 2 % at 45 ˚, ± 5 % at 75 ˚
• Azimuth Error Less than 0.5 %
• Tilt Error Less than 0.5 %
• Temperature Response -0.11 ± 0.04 % per C
• Uncertainty in Daily Total Less than 5 %
• Detector Blue-enhanced silicon photodiode
• Housing Anodized aluminum body with acrylic diffuser
• IP Rating IP68
• Operating Environment -40 to 70 C, 0 to 100 % relative humidity, can be submerged in water up to depths of 30 m
• Dimensions 30.5 mm diameter, 37 mm height Mass (with 5 m of cable) 140 g Cable 5 m of two conductor, shielded, twisted-pair wire; additional cable available in multiples of 5 m; santoprene rubber jacket; pigtail lead wires

Ordering information 

SQ-521-SS