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SQ-313: Sun Calibration Line Quantum with 3 Sensors

Quantum Sensors

Product Description

Apogee line quantum sensors measure a spatial average of photosynthetically active radiation. The SQ-313 has a sensor bar with three sensors and is calibrated for use in sunlight. The sensor housing design features an integrated bubble level and is fully potted making the sensor weatherproof. Photosynthetically active radiation (PAR), or photosynthetic photon flux density (PPFD), 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:

Self powered


0.2 mV per μmol m-2 s-1

Calibration Factor:

5.0 μmol m-2 s-1 per mV (reciprocal of sensitivity)

Calibration Uncertainty:

± 5%

Measurement Repeatability:

less than 1%

Non-stability (Long-term Drift):

less than 2 % per year


less than 1 % (up to 4000 μmol m-2 s-1; maximum PPF measurement is 2500 μmol m-2 s-1)

Response Time:

less than 1 ms

Field of View:


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


50 cm length, 1.5 cm width, 1.5 cm height


275 g (with 5 m of lead wire)


5 m of shielded, twisted-pair wire. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires

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