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Enabling better global research outcomes in soil, plant & environmental monitoring.

SQ-215 Amplified 0-5 Volt Sun Calibration Quantum Sensor

The SQ-215 is an amplified quantum sensor that measures photosynthetically active radiation and is calibrated for use in sunlight. The sensor housing design features a fully potted, domed-shaped head making the sensor fully weatherproof and self-cleaning.

Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the wavelength range from 400 to 700 nanometers and is strongly correlated with plant growth. Gardeners, greenhouse managers, growth chamber users and salt-water aquarists measure PAR to insure optimal specimen health.

Power Supply: 5-24 V DC with a nominal current draw of 300 µA
Sensitivity: 2.0 mV per µmol m-2 s-1
Calibration Factor: 0.5 µmol m-2 s-1 per mV (reciprocal of sensitivity)
Calibration Uncertainty: ± 5%
Measurement Repeatability: < 1%
Non-stability (Long-term Drift): < 2% per year
Non-linearity: < 1% (up to 2500 µmol m-2 s-1; maximum PPF measurement is 2500 µmol m-2 s-1)
Response Time: < 1 ms
Field of View: 180°
Spectral Range: 410 nm to 655 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 30m.
Dimensions: 2.4 cm diameter and 2.8 cm height
Mass: 90g (with 5m of lead wire)
Cable: 5m of shielded, twisted-pair wire. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires.
Warranty: 4 years

The sensor measures photosynthetically active radiation and is calibrated for use under electric lights. The sensor housing design features a fully potted, domed-shaped head making the sensor fully weatherproof and self-cleaning. Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the wavelength range from 400 to 700 nanometers and is strongly correlated with plant growth. Gardeners, greenhouse managers, growth chamber users and salt-water aquarists measure PAR to insure optimal specimen health.

Cosine Response

Screen Shot 01-18-16 at 01.00 PM

Mean cosine response of twenty-three SQ series quantum sensors (error bars represent two standard deviations above and below mean).
Cosine response measurements were made by direct side-by-side comparison to the mean of four reference thermopile pyranometers, with solar zenith angle-dependent factors applied to convert total shortwave radiation to PPFD. Blue points represent the AM response and red points represent the PM response.

Spectral Response

SQ224 graph 2

Mean spectral response of six SQ series quantum sensors (error bars represent two standard deviations above and below mean) compared to PPFD weighting function. Spectral response measurements were made at 10nm increments across a wavelength of 300 to 800nm in a monochromator with an attached electric light source. Measured spectral data from each quantum sensor were normalised by the measured spectral response of the monochromator/electric light combination, which was measured with a spectroradiometer.

Temperature Response

SQ224 graph 3

Mean temperature response of eight SQ series quantum sensors (error bars represent two standard deviations above and below mean). Temperature response measurements were made at 10­°C intervals across a temperature range of approximately -10 to 40°C in a temperature controlled chamber under a fixed, broad spectrum, electric lamp. At each temperature set point, a spectroradiometer was used to measure light intensity from the lamp and all quantum sensors were compared to the spectroradiometer. The spectroradiometer was mounted external to the temperature control chamber and remained at room temperature during the experiment.