SQ-512-SS Amplified 0-2.5 V Full-Spectrum Quantum Sensor

The SQ-512 is an amplified full-spectrum quantum sensor with a 0 to 2.5 V output. The sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include PPFD measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments. Quantum sensors are also used to measure PAR/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

How is the SQ-500 different from previous Apogee quantum sensors?
The SQ-500 is a full spectrum quantum sensor with a spectral range of 389 to 692 nm ± 5 nm, which can be seen in the graph below. This improved spectral response increases the accuracy of LED measurements.

Where is the SQ-500 used?
The SQ-500 is used to measure incoming PPFD measurements in outdoor environments, greenhouses, growth chambers, and aquariums.

Specifications

• Power Supply 5 to 24 V DC
• Current Draw at 12 V is 57 µA
• Output (Sensitivity) 0.625 mV per µmol mˉ² sˉ¹
• Calibration Factor (Reciprocal of Sensitivty) 1.6 µmol mˉ² sˉ¹ per mV Calibration Uncertainty ± 5 %
• Calibrated Output Range 0 to 2.5 V
• Measurement Range 0 to 4000 µmol mˉ² sˉ¹
• Measurement Repeatability Less than 0.5 %
• Long-term Drift 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 389 to 692 nm ± 5 nm (wavelegths where response is greater than 50 % of maximum)
• Spectral Selectivity Less than 10 % from 412 to 682 nm ± 5 nm Directional (Cosine) Response ± 5 % at 75˚ zenith angle
• Azimuth Error Less than 0.5 %
• Tilt Error Less than 0.5 %
• Temperature Response -0.11 ± 0.04 % Cˉ¹
• Uncertainty in Daily Total Less than 5 %
• Detector Blue-enhanced silicon photodiode
• 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 (with 5 m of cable) 140 g Cable 5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel (316), M8 connector
• Warranty 4 years against defects in materials and workmanship
• Manufactured Assembled in the USA