The SQ-620 Extended Range PFD sensor is a self-powered sensor. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions. The sensor cable includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement from permanent installations for maintenance and calibration. Typical applications of Extended Range PFD sensors include incoming PFD measurements over plant canopies in indoor greenhouses or in growth chambers, and reflected or under-canopy (transmitted) PFD measurements in the same environments. Since the detector on this particular Extended Range sensor is sensitive to radiation with wavelengths up to 1100 nm, beyond the range of wavelengths that influence plants, we recommend only using the SQ-620 sensors in indoor grow environments utilizing LED lights.
The analog version of this sensor (SQ-620) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the microCache.
Power Supply： Self-powered
Sensitivity： 0.05 mV per µmol mˉ² sˉ¹
Calibration ： Factor20 µmol mˉ² sˉ¹ per mV
Calibration Uncertainty： ± 5 %
Measurement Range： 0 to 4000 µmol mˉ² sˉ¹
Measurement Repeatability： Less than 0.5 %
Calibrated Output Range： 0 to 200 mV
Long-term Drift (Non-stability) ： Less than 2 % per year
Non-linearity： Less than 1 % (up to 4000 µmol mˉ² sˉ¹)
Response Time： Less than 1 ms
Field of View： 180˚
Spectral Range： 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum)
Directional (Cosine) Response： ± 2 % at 45˚; ± 5 % at 75˚ zenith angle
Azimuth Error： Less than 0.5 %
Tilt Error： Less than 0.5 %
Temperature Response： -0.11 ± 0.04 % per C
Uncertainty in Daily Total： Less than 5 %
Housing： Anodized aluminum body with acrylic diffuser
IP Rating： IP68
Operating Environment： -40 to 70 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： 51 g
Cable： 5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel (316), M8 connector located 25 cm from sensor head
Warranty： 4 years against defects in materials and workmanship
