Apogee Instruments SQ-616 400-750 nm USB output ePAR sensor

Apogee's newest high-quality ePAR sensor, the ePAR Sensor, was developed in 2021 as an upgrade to our ePFD sensor and is designed to measure the newly defined ePAR 400-750 nm radiant range, which research shows is photosynthetically active, exceeding the traditional 400-700 nm range. The intelligent SQ-616 ePAR sensor can be connected directly to a computer (Windows or MacOS X) via the USB interface and use the included software to measure, graph and log real-time PPFD data. The sensor can also act as a standalone PAR data logger by simply plugging into most standard 5V DC USB plugs. The internal memory in the sensor can store 10,000 user-defined periodic measurements, which can be downloaded as a CSV file to a computer for analysis.

• Resolution 0.1 µmol mˉ² sˉ¹
• Calibration factor Individual for each sensor and stored in the firmware
• Calibration uncertainty ± 5 %
• Repeatability of measurement Less than 1 % up to 4000 µmol mˉ² sˉ¹
• Long-term drift (volatility) Less than 2% per year
• Nonlinearity Less than 1% (up to 4000 µmol mˉ² sˉ¹)
• Response time software update every second
• viewing angle 180˚
• Spectral range 400 to 750 nm ± 5 nm (wavelengths at which the response is greater than 50%)
• Angle measurement (cosine based) response ± 2% at 45 ˚, ± 5% at 75 ˚
• Temperature response -0.11 ± 0.04 % per C
• Azimuth error Less than 0.5%
• Slope error Less than 0.5%
• Housing Housing made of anodized aluminum with acrylic diffuser
• protection class IP68
• Operating environment -40 to 70 C, relative humidity 0 to 100%, can be submerged up to 30 m water depth.
• Dimensions Diameter 30.5 mm, Height 37 mm
• Weight (with 5 m cable) 140 g
• USB cable 4.5 m
• Power consumption (when recording) 61 mA
• 4-year warranty on material and processing defects
• Made in the USA