SQ-205X Apogee PAR Light Sensor calibrated for Sunlight (5Vdc Vdc Supply)


Apogee Instruments


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The SQ-215 is an amplified quantum sensor that measures photosynthetically active radiation and is calibrated for use in sunlight. The sensor housing design features a fully potted, domed-shaped head making the sensor fully weatherproof and self-cleaning. Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the wavelength range from 400 to 700 nanometers and is strongly correlated with plant growth. Gardeners, greenhouse managers, growth chamber users and salt-water aquarists measure PAR to insure optimal specimen health.

Power Supply: 5-24 VDC with a nominal current draw of 300 µA
Sensitivity: 2.0 mV per µmol m-2 s-1
Calibration Factor: 0.5 µmol m-2 s-1 per mV (reciprocal of sensitivity)
Calibration Uncertainty: ± 5%
Measurement Repeatability: < 1%
Non-stability (Long-term Drift): < 2 % per year
Non-linearity: < 1 % (up to 2500 µmol m-2 s-1; maximum PPF measurement is 2500 µmol m-2 s-1)
Response Time: < 1 ms
Field of View: 180°
Spectral Range: 410 nm to 655 nm
Directional (Cosine) Response: ± 5 % at 75° zenith angle
Temperature Response: 0.06 ± 0.06 % per C
Operating Environment: -40 to 70 C, 0 to 100 % relative humidity, Can be submerged in water up to depths of 30 m
Dimensions: 2.4 cm diameter and 2.8 cm height
Mass: 90 g (with 5 m of lead wire)
Cable: 5 m of shielded, twisted-pair wire. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires
Warranty: 4 years

Apogee Instruments Quantum / PAR Meters

Measure photosynthetically active radiation (PAR, PPF, PPFD) from the sun or electric lights in μmol m-2s-1

  • Next generation design
  • Built to withstand extreme conditions
  • Self-cleaning dome-shaped head does not trap water or debris
  • Meets strict specifications for accuracy
  • Trusted and installed as a standard feature in growth chambers manufactured by industry leaders Convirion, Biochambers, Environmental Growth Chambers, and Percival Scientific
  • Available in single sensor or in multi-sensor “line quantum” models that provide spatially-averaged measurements useful in settings where light is non-uniform (i.e. under plant canopies)
  • Separate sunlight and electric calibrations minimize spectral errors
  • Excellent cosine response
  • Sensors are fully submersible
  • Easily integrates with dataloggers
  • Also available with handheld meter
  • Custom options available

Quantum Sensors

Apogee Instruments quantum sensors measure photosynthetic light levels in both air and water, combining accuracy and durability at an affordable price. The sensor heads feature a unique blue diffuser that reduces spectral error to less than 5% for sunlight (direct, diffuse, under plant canopy, reflected from plant canopy) and common electric plant lights (fluorescent, metal halide, high pressure sodium), and less than 10 % for LEDs (blue, green, red, cool white, neutral white, and warm white). You can read more about using our quantum sensors with various light sources in our Knowledge Base.

Apogee’s quantum sensors are the culmination of over 16 years of field-testing and feedback from researchers worldwide. The sensor heads are potted solid with no internal air space for use in all climate conditions. In addition, all Apogee designs are subjected to brutal accelerated aging tests to ensure reliability and precision even under the harshest of conditions.

Each Apogee quantum sensor is carefully pre-calibrated to NIST standards in carefully controlled conditions. Our stock models are ready to go out of the box and come in several configurations readily compatible with most data-loggers. Our custom options can provide maximum flexibility by offering different multipliers, outputs, and cable lengths. With Apogee, you are dealing directly with the manufacturer and we can work with you to deliver quantum sensors that fit your specific application.

For reference, a quantum refers to the amount of energy carried by a photon. Quantum meters approximate the quantity of photons between 400 and 700 nanometers. Photosynthesis is largely driven by the number of photons between these wavelengths. Photosynthetically Active Radiation (PAR) is also called the Photosynthetic Photon Flux (PPF) or Photosynthetic Photon Flux Density (PPFD) and the units are μmol m-2 s-1 (micromoles of photons per meters squared per second).

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