Apogee Instruments SQ-520 - Sensor PAR/PPFD

The Sonda SQ-520 can be connected directly to a computer via USB cable for point or graph and protocol measurement of PPFD(photosynthetic photon flux density = amount of PAR received by the plant from lighting) in real-time using the included software. It can also serve as a standalone protocol 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 periodic measurements with the option to save in CSV format.

Usage

• measurement of incoming PPFD.Unlike traditional LUX meters, it can be used for measuring LED lighting, where PAR and PPFD are crucial!

Specifications

• resolution: 0.1 µmol × m^(-2) × s^(-1)
• calibration factor: custom for each probe; stored in firmware
• calibration deviation: ± 5 %
  
• measurement repeatability: < 1 % up to 4000 µmol × m^(-2) × s^(-1)
  
• long-term measurement accuracy degradation: < 2 % per year
  
• nonlinearity: < 1 % (up to 4000 µmol × m^(-2) × s^(-1))
  
• response time: software updates every second
  
• field of view: 180°
  
• light spectrum range: 389 - 692 nm ± 5 nm (wavelengths where the response is greater than 50% of the 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)
  
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