QS6 – SDI-12 Digital Quantum Sensor

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The QS6 – SDI-12 is a digital sensor that uses SDI-12 communication protocol.

The sensor features a rugged, self-cleaning sensor housing design, and high-quality cable with M-12 connector for easy connection to Delta-T Devices SDI-12 cable networks.

Typical applications include PPFD (Photosynthetic Photon Flux Density) measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments.



Input Voltage Requirement 5.5 to 24 V DC
Current Draw 1.4 mA (quiescent), 1.8 mA (active)
Calibration Uncertainty ± 5 %
Measurement Repeatability Less than 1 %
Long-term Drift (Non-stability) Less than 2 % per year
Non-linearity Less than 1 % (up to 2500 µmol mˉ² sˉ ¹)
Response Time 0.6 s, time for detector signal to reach 95 % following a step change, fastest data transmission rate for SDI-12 circuitry is 1 s
Field of View 180˚
Spectral Range 370 to 650 nm ( wavelengths where response is greater than 50 % of maximum)
Directional (Cosine) Response ± 5 % at 75˚ zenith angle
Temperature Response Less than 0.5 % from -20 to 50 C
Operating Environment -20 to 60 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions 30.5 mm diameter, 37 mm height
Mass (with 5 m of cable) 140 g



Main components and software

Mountings and enclosures

Installation accessories

Cables and networks

Remote communications

Spares and consumables

Power options


Product Resources

Data Sheets



Technical Notes