SQ-214 PAR Sensor for Sunlight with Output (4-20 mA) View larger

SQ-214 PAR Sensor for Sunlight with Output (4-20 mA)


Apogee Instruments



PAR Sensor for Sunlight with Output (4-20 mA)

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The SQ-214 is an amplified sensor with a 4-20 mA output and exhibits excellent cosine response. The sensor was designed for use in environments with significant background electrical noise that can be found in many industrial applications. The sensor 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: 5-36 V DC with a maximum current drain 22 mA (2 mA quiescent current drain)
Sensitivity: 0.0064 mA per µmol m-2 s-1
Calibration Factor: 156 µmol m-2 s-1 per mA (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 )
Response Time: < 1 ms
Field of View: 180°
Spectral Range: 410 nm to 655 nm (wavelengths where response is greater than 50 % of maximum)
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: 2.4 cm diameter and 2.8 cm height
Mass: 140 g (with 5 m of lead wire)
Cable: 5 m of shielded, twisted-pair wire. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires
Warranty: 4 years

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