Apogee Instruments SQ-520 - PAR/PPFD probe

The SQ-520 can be connected directly to a computer via USB cable for real-time point or graphing and logging of PPFD(photosynthetic photon flux density = the amount of PAR received by the plant from lighting) using the included software.
It can also serve as a stand-alone logging unit by simply connecting to a standard 5 V DC USB adapter. The internal memory inside the probe has a capacity of 10,000 user-specified periodicmeasurements with the option to save in CSV format.

Comparedto conventional LUX meters, it can be used for measuringLED lighting, where PAR and PPFD play a crucial role!

Specifications:
- Resolution: 0.1 µmol × m^(-2) × s^(-1)
- Calibration factor: custom for each probe; stored in firmware
- Calibration deviation: ± 5%
- Repeatability: < 1% up to 4000 µmol × m^(-2) × s^(-1)
- long-term degradation of measurement accuracy: < 2% per year
- non-linearity: < 1% (up to 4000 µmol × m^(-2) × s^(-1))
- time response: software updates every second
- field of view: 180°
- light spectrum range: 389 - 692 nm ± 5 nm (wavelengths where response is greater than 50% of maximum)
- spectral selectivity: < 10% from 412 to 682 nm ± 5 nm
- directional (cosine) response: ± 5% at 75° zenith angle
- azimuth error: < 0.5%
- tilt error: < 0.5%
- temperature response: -0.11 ± 0.03 % C^(-1)
- measurement uncertainty in daily sum: < 5 %
- probe: enhanced blue silicon photodiode
- housing: anodized aluminum body with acrylic diffuser
- fully dust and water resistant (IP68)
- operating environment: 40 - 70 °C; 0 - 100% RH;
- separate sensors can be immersed to a depth of up to 30 meters
- size: Ø 24 mm, 37 mm length
- USB cable: 4.6 m
- probe weight: 90 g
- current draw: 61 mA
- warranty: 4 years against defects in materials and workmanship
- made in USA