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The SQ-500 is a self-powered, analog full-spectrum quantum sensor with a 0 to 40 mV output. The sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include PPFD 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 IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

 

The analog version of this sensor (SQ-500) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the microCache.

 

Apogee Instruments SQ-500-SS: Full-Spectrum Quantum Sensor

$425.00Price
  • Power Supply

    Self-powered

     

    Output (Sensitivity)

    0.01 mV per µmol mˉ² sˉ¹

     

    Calibration Factor (Reciprocal of Sensitivty)

    100 µmol mˉ² sˉ¹ per mV

     

    Calibration Uncertainty

    ± 5 %

     

    Calibrated Output Range

    0 to 40 mV

     

    Measurement Range

    0 to 4000 µmol mˉ² sˉ¹

     

    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

    180˚

     

    Spectral Range

    389 to 692 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

    ± 5 % at 75˚ zenith angle

     

    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

    24 mm diameter, 37 mm height

     

    Mass

    100 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)

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