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SQ-120: Electric Calibration Quantum Sensor

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Product Description

The SQ-120 is a self-powered quantum sensor that measures photosynthetically active radiation and is calibrated for use with 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.

Owner’s Manuals

Spec Sheet: SQ Series

Owner's Manual: SQ Series


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
< 1 %
Non-stability (Long-term Drift)
< 2 % per year
< 1 % (up to 4000 µmol m-2 s-1 )
Response Time
< 1 ms
Field of View
Spectral Range
410 nm to 655 nm (wavelengths where response is greater than 50 % of maximum)
Response Time
± 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
2.4 cm diameter and 2.8 cm height
90 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
4 years

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