SQ-514-SS Full-Spectrum 4-20 mA output

The SQ-514 is an amplified full-spectrum quantum sensor with a 4 to 20 mA output. The sensor was designed for use in environments with significant background electrical noise that can be found in many industrial applications. The sensor features a rugged, self-cleaning sensor housing design. Typical applications include PPFD (Photosynthetic Photon Flux Density) measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments. Quantum sensors are also used to measure PAR (Photosynthetically Active Radiation)/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

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Specifications 

  • Power Supply 12 to 24 V DC
  • Current Draw maximum of 20 mA
  • Output (sensitivity) 0.004 mA per µmol mˉ² sˉ¹
  • Calibration Factor 250 µmol mˉ² sˉ¹ per mA
  • Calibration Uncertainty ± 5 %
  • Output Range 4 to 20 mA
  • Measurement Repeatability Less than 0.5 %
  • Long-term Drift Less than 2 % per year
  • Non-linearity Less than 1 % (up to 4000 µmol mˉ² sˉ¹)
  • Response Time Less than 1 ms
  • Field of View 180Ëš
  • Spectral Range 391 to 695 nm ± 5 nm (wavelegths 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 45Ëš zenith angle, ± 5 % at 75Ëšzenith angle
  • Azimuth Error Less than 0.5 %
  • Tilt Error Less than 0.5 %
  • Temperature Response -0.1 % 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 shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions)
  • Warranty 4 years against defects in materials and workmanship

 

Ordering information 

SQ-514-SS

sq-500-spec-sheet

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