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

The latest, high-end ePAR sensor from Apogee, the SQ-616 ePAR, was created in 2021 as an upgrade to our ePFD sensor and was designed to measure the newly defined ePAR radiation range of 400-750 nm, which is considered photosynthetically active and extends beyond the traditional range of 400-700 nm. The intelligent SQ-616 ePAR sensor can be directly connected to a computer (Windows or MacOS X) via a USB interface and can perform point measurements or create graphs and record real-time PPFD data using the provided software. The sensor can also function as a standalone PAR data logger, simply by connecting it to most standard 5V DC USB plugs. The sensor's internal memory is capable of storing 10,000 user-defined periodic measurements, which can be downloaded to a computer for analysis as a CSV file.

• Resolution 0.1 µmol mˉ² sˉ¹
• Calibration factor Own for each sensor and stored in the firmware
• Calibration uncertainty ± 5%
• Measurement repeatability Less than 1% up to 4000 µmol mˉ² sˉ¹
• Long-term drift Less than 2% per year
• Non-linearity Less than 1% (up to 4000 µmol mˉ² sˉ¹)
• Response time Software update every second
• Field of view 180˚
• Spectral range 400 to 750 nm ± 5 nm (wavelengths where response is greater than 50%)
• Cosine response ± 2% at 45˚, ± 5% at 75˚
• Temperature response -0.11 ± 0.04% per °C
• Azimuth error Less than 0.5%
• Tilt error Less than 0.5%
• Enclosure Anodized aluminum body with acrylic diffuser
• Protection class IP68
• Operating environment -40 to 70°C, relative humidity 0 to 100%, can be submerged in water up to 30 m depth.
• Dimensions Diameter 30.5 mm, height 37 mm
• Weight (with 5 m cable) 140 g
• USB cable 4.5 m (15 ft)
• Current draw (during recording) 61 mA
• Warranty 4 years for material and workmanship defects
• Made in the USA