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SQ-301X-SS: Line Quantum with 10 Sensors

Updated:2025-03-13

Brand: Apogee
Model: SQ-301X-SS
Description: Apogee line quantum sensors measure a spatial average of photosynthetically active radiation (PAR). The SQ-301X-SS has a sensor bar with 10 sensors and is self-powered with a 0 to 250 mV output. The s
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Product Details

Overview of SQ-301X-SS: Line Quantum with 10 Sensors：

User's Manual

Apogee line quantum sensors measure a spatial average of photosynthetically active radiation (PAR). The SQ-301X-SS has a sensor bar with 10 sensors and is self-powered with a 0 to 250 mV output. The sensor is calibrated for use in sunlight and some broadband light sources only. The sensor housing design features an integrated bubble level and is fully potted, making the sensor water- and weatherproof. Typical applications include photosynthetic photon flux density (PPFD) measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

SQ-301X-SS Sensor Drawing：

Specifications of SQ-301X-SS:

Power Supply	Self-powered
Sensitivity	0.1 mV per μmol mˉ2 sˉ1
Calibration Factor	10 μmol mˉ2 sˉ1 per mV (reciprocal of sensitivity)
Calibration Uncertainty	± 5 %
Calibrated Output Range	0 to 250 mV
Measurement Repeatability	Less than 0.5 %
Non-stability (Long-term Drift)	Less than 2 % per year
Non-linearity	Less than 1 % (up to 2500 μmol mˉ2 sˉ1)
Response Time	Less than 1 ms
Field of View	180°
Spectral Range	370 nm to 650 nm (wavelengths where response is greater than 50 % of maximum
Directional (Cosine) Response	± 5 % at 75? zenith angle
Temperature Response	-0.04 % per C
Operating Environment	-10 to 60 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Sensor Dimensions	616.4 mm length, 13.6 mm height, 16.5 mm width
Mass	310 g
Cable	5 m of two conductor, shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires; stainless steel, M8 connector located 25 cm from sensor head
Warranty	4 years against defects in materials and workmanship