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

Apogee's newest, cutting-edge ePAR sensor 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 research shows is photosynthetically active and exceeds the traditional 400-700 nm range. The SQ-616 ePAR Smart Sensor can be connected directly to a computer (Windows or MacOS X) via USB to make spot measurements or to graph and record PPFD data in real time using the supplied software. The sensor can also function as a stand-alone PAR datalogger, simply connect it to most standard 5V DC USB plugs. The internal memory in the sensor head is capable of storing 10,000 user-specified periodic measurements that can be downloaded to a computer for analysis as a CSV file.

Specifications:
- 0 resolution,1 µmol mˉ² sˉ¹
- Calibration factor Custom for each sensor and stored in firmware
- Calibration uncertainty ± 5%
- Measurement repeatability Less than 1% up to 4000 µmol mˉ² sˉ¹
- long-term drift (instability) Less than 2% per year
- nonlinearity Less than 1% (up to 4000 µmol mˉ² sˉ¹)
- response time Software updates every second
- field of view 180˚
- spectral range 400 to 750nm ± 5nm (wavelengths, where the response is greater than 50%)
- directional (cosine) response ± 2% at 45˚, ± 5% at 75˚
- temperature response -0.11 ± 0.04% at C
- azimuth error Less than 0.5%
- tilt error less than 0,5%
- housing Anodized aluminium body with acrylic diffuser
- degree of protection IP68
- operating environment -40 to 70 C, relative humidity 0 to 100%, can be immersed in water up to 30 m.
- dimensions Diameter 30.5 mm, height 37 mm
- weight (with 5 m cable) 140 g
- USB cable 4.5 m (15 ft)
- current draw (when recording) 61 mA
- 4-year warranty against defects in materials and workmanship
- made in USA