SQ-311-SS: Sun Calibration Line Quantum with 10 Sensors

Apogee line quantum sensors measure a spatial average of PAR (Photosynthetically Active Radiation).

  • Product Name:Sun Calibration Line Quantum with 10 Sensors
  • Item No.:SQ-311-SS
  • Manufacturers:Apogee
  • Country of Origin:USA

Apogee line quantum sensors measure a spatial average of  PAR (Photosynthetically Active Radiation). The SQ-311 has a sensor bar with 10 sensors and is self-powered with a 0 to 800 mV output. The sensor is calibrated for use in sunlight (Custom electric light calibration is available. Contact Apogee for details).  The sensor housing design features an integrated bubble level and is fully potted making the sensor weatherproof. 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/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP67 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

Power Supply    Self-powered

Sensitivity    0.2 mV per µmol mˉ² sˉ¹

Calibration Factor    5 µmol mˉ² sˉ¹ per mV (reciprocal of sensitivity)

Calibration Uncertainty    ± 5 %

Calibrated Output Range    0 to 800 mV

Measurement Repeatability    Less than 0.5 %

Non-stability (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    180˚

Spectral Range    410 nm to 655 nm

Spectral Selectivity    Less than 10 % from 469 to 653 nm

Directional (Cosine) Response    ± 5 % at 75˚ zenith angle

Temperature Response    0.06 ± 0.06 % 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    700 mm length, 15 mm width, 15 mm height

Mass    375 g (with 5 m of lead wire)

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