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Apogee Instruments
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Teracom
Apogee line quantum sensors measure a spatial average of photosynthetically active radiation (PAR). The SQ-350 is a sensor bar with 10 detectors, one long diffuser, 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.
A single strip diffuser produces a more representative average than individual diffusers placed over each detector by diffusing light over a larger area.
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| Specification | Value |
|---|---|
| Power Supply | Self-powered |
| Sensitivity | 0.1 mV per µmol m⁻² s⁻¹ |
| Calibration Factor | 10 µmol m⁻² s⁻¹ per mV (reciprocal of sensitivity) |
| Calibration Uncertainty | ±5% |
| Calibrated Output Range | 0 to 250 mV |
| Non-stability (Long-term Drift) | Less than 2% per year |
| Non-linearity | Less than 1% (up to 2,500 µmol m⁻² s⁻¹) |
| Response Time | Less than 1 ms |
| Spectral Range | 370 nm to 650 nm (where response is >50% of maximum) |
| Temperature Response | -0.04% per °C |
| Operating Environment | -10 to 60 °C; 0 to 100% relative humidity; can be submerged in water to depths of 30 m |
| Dimensions | 616.4 mm length × 12.7 mm height × 16.5 mm width |
| Mass | 310 g |
| Cable | 5 m two-conductor, shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, and 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 |
| Weight | .75 lbs |
|---|---|
| Dimensions | 26 × 1 × 1 in |
