Introduction to Sensor
The SQ-422-SS is a digital quantum sensor that measures PPFD/PAR using Modbus RTU over RS-232/RS-485. It supports sunlight and electric-light calibration, automatic underwater correction, and is designed for reliable indoor, outdoor, greenhouse, and aquatic measurements.
Specifications
Specifications
| Specification | Details |
|---|---|
| Input Voltage Requirement | 5.5 to 24 V DC |
| Average Max Current Draw | RS-232: Quiescent 36.87 mA; Active 37.06 mA RS-485: Quiescent 37.37 mA; Active 42.30 mA |
| Calibration Uncertainty | ±5% |
| Measurement Repeatability | <1% |
| Long-Term Drift | <2% per year |
| Non-Linearity | <1% up to 4000 µmol m⁻² s⁻¹ |
| Field of View | 180° |
| Spectral Range | 410 to 655 nm (wavelengths where response is >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% RH; submersible up to 30 m |
| Dimensions | 30.5 mm diameter × 37 mm height |
| Mass | 140 g (with 5 m cable) |
| Cable | 5 m, two-conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; additional cable available in 5 m increments |
| Warranty | 4 years against defects in materials and workmanship |
| Manufacturing | Assembled in the USA |
Features
Applications