SQ-204X-SS Amplified 4-20 Milliamp Original Quantum Sensor

The SQ-204X-SS is an amplified original quantum sensor with a 4 to 20 mA output. The sensor was designed for use in environments with significant background electrical noise that can be found in many industrial applications. The sensor features a rugged, self-cleaning sensor housing design, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. 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. Quantum sensors are also used to measure PAR (Photosynthetically Active Radiation)/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement for maintenance and recalibration.

SPECIFICATIONS

• Power Supply: 7 to 24 V DC with a maximum current draw 22 mA (2 mA quiescent current draw)
• Sensitivity: 0.004 mA per µmol mˉ² sˉ¹
• Calibration Factor: 250 µmol mˉ² sˉ¹ per mA
• Calibration Uncertainty: ± 5 %
• Calibrated Output Range: 4 to 20 mA
• Measurement Repeatability: Less than 0.5 %
• Non-stability (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: 370 nm 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
• Cable: 5 m of shielded, twisted-pair wire. TPR jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires
• Warranty: 4 years against defects in materials and workmanship
• Manufactured: Assembled in the USA