The SQ-522-SS Modbus Quantum Sensor provides accurate Photosynthetic Photon Flux Density (PPFD) measurements with a Modbus RTU digital output via RS-232 or RS-485 for seamless integration with data loggers and monitoring systems. Its rugged anodized aluminum housing, durable acrylic diffuser, and high-quality cable with pre-tinned pigtail leads ensure reliable performance in demanding environments.
Specifications
| Parameter | Specification |
|---|---|
| Input Voltage Requirement | 5.5 to 24 V DC |
| Average Maximum Current Draw | RS-232: 37 mA; RS-485: 37 mA (quiescent), 42 mA (active) |
| Calibration Uncertainty | ±5 % |
| Measurement Repeatability | Less than 1 % |
| Long-term Drift | Less than 2 % per year |
| Non-linearity | Less than 1 % (up to 4000 µmol m⁻² s⁻¹) |
| Spectral Range | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50% of maximum) |
| Spectral Selectivity | Less than 10 % from 412 to 682 nm ± 5 nm |
| Directional (Cosine) Response | ±2 % at 45°; ±5 % at 75° zenith angle |
| Temperature Response | -0.11 ± 0.04 % per °C |
| Operating Environment | -40 to 70 °C; 0 to 100 % relative humidity; submersible in water up to 30 m depth |
| Dimensions | 30.5 mm diameter × 37 mm height |
| Mass (with 5 m Cable) | 140 g |
| Cable | 5 m two-conductor, shielded, twisted-pair wire with TPR jacket, pre-tinned pigtail lead wires, and stainless steel (316) M8 connector |
| Warranty | 4 years against defects in materials and workmanship |
| Manufacturing | Assembled in the USA |
Greenhouse Monitoring
Precision Agriculture
Environmental Monitoring
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