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Quantum Light Pollution Sensor Support

Quantum Light Pollution sensor support

Introduction
Specifications
Videos
Product Manuals
Spec Sheets
Technical Drawings
Helpful Articles & Links
FAQs
Software & Datalogger Programs
Recalibration & Repair
Applications and Uses

 

Quantum Light Pollution Sensor Introduction

Radiation that drives photosynthesis is called photosynthetically active radiation (PAR) and is typically defined as total radiation across a range of 400 to 700 nm. PAR is almost universally quantified as photosynthetic photon flux density (PPFD) in units of micromoles per square meter per second (µmol m-2 s-1, equal to microEinsteins per square meter per second) summed from 400 to 700 nm (total number of photons from 400 to 700 nm). However, ultraviolet and far-red photons outside the defined PAR range of 400-700 nm can also contribute to photosynthesis and influence plant responses (e.g., flowering).

Sensors that measure PPFD are often called quantum sensors due to the quantized nature of radiation. A quantum refers to the minimum quantity of radiation, one photon, involved in physical interactions (e.g., absorption by photosynthetic pigments). In other words, one photon is a single quantum of radiation. Sensors that function like traditional quantum sensors, but measure a wider range of wavelengths can be thought of as an ‘extended range’ quantum sensor.

Typical applications of traditional quantum sensors include incoming PPFD measurement over plant canopies in outdoor environments or in greenhouses and growth chambers, and reflected or under-canopy (transmitted) PPFD measurement in the same environments. The Quantum Light Pollution Sensor uses a detector that is sensitive to radiation up to about 1100 nm, well beyond the range of wavelengths that influence photosynthesis and plant responses. This means this particular sensor should only be used for photon flux density measurements under LEDs.

 

Quantum Light Pollution Sensor Specifications
Apogee Instruments Extended Range PFD Sensor Specifications
  SQ-640-SS SQ-642-SS SQ-644-SS SQ-645-SS SQ-646 SQ-647-SS
Power Supply Self-powered 5 to 24 V DC 12 to 24 V DC 5.5 to 24 V DC 5 V USB power source 5.5 to 24 V DC
Current Draw - 12 V is 57 µA Maximum of 20 mA 12 V is 57 µA 61 mA when logging 1.4 mA (quiescent), 1.8 mA (active)
Sensitivity 1 mV per µmol m-2 s-1 12.5 mV per µmol m-2 s-1 0.08 mA per µmol m-2 s-1 25 mV per µmol m-2 s-1 - -
Output Type 0 to 200 mV 0 to 2.5 V 4 to 20 mA 0 to 5 V USB SDI-12
Resolution - - - - 0.1 µmol m-2 s-1 -
Calibration Factor 1 µmol m-2 s-1 per mV 0.08 µmol m-2 s-1 per mV 12.5 µmol m-2 s-1 per mA 0.04 µmol m-2 s-1 per mV Custom for each sensor and stored in the firmware Custom for each sensor and stored in the firmware
Calibration Uncertainty ± 5 % ± 5 % ± 5 % ± 5 % ± 5 % ± 5 %
Measurement Range 0 to 200 µmol m-2 s-1 0 to 200 µmol m-2 s-1 0 to 200 µmol m-2 s-1 0 to 200 µmol m-2 s-1 0 to 200 µmol m-2 s-1 0 to 200 µmol m-2 s-1
Measurement Repeatability Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 %
Long-term Drift per Year Less than 2 % per year Less than 2 % per year Less than 2 % per year Less than 2 % per year Less than 2 % per year Less than 2 % per year
Non-linearity Less than 1 % (up to 400 µmol m-2 s-1) Less than 1 % (up to 400 µmol m-2 s-1) Less than 1 % (up to 400 µmol m-2 s-1) Less than 1 % (up to 400 µmol m-2 s-1) Less than 1 % (up to 400 µmol m-2 s-1) Less than 1 % (up to 400 µmol m-2 s-1)
Response Time Less than 1 ms Less than 1 ms Less than 1 ms Less than 1 ms Software updates every second Less than 0.6 s
Field of View 180° 180° 180° 180° 180° 180°
Spectral Range 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum)
Directional (Cosine) Response ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle ± 2 % at 45°; ± 5 % at 75° zenith angle
Azimuth Error Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 %
Tilt Error Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 % Less than 0.5 %
Temperature Response -0.11 ± 0.04 % per C -0.11 ± 0.04 % per C -0.11 ± 0.04 % per C -0.11 ± 0.04 % per C -0.11 ± 0.04 % per C -0.11 ± 0.04 % per C
Uncertainty in Daily Total Less than 5 % Less than 5 % Less than 5 % Less than 5 % Less than 5 % Less than 5 %
Housing Anodized aluminum body with acrylic diffuser Anodized aluminum body with acrylic diffuser Anodized aluminum body with acrylic diffuser Anodized aluminum body with acrylic diffuser Anodized aluminum body with acrylic diffuser Anodized aluminum body with acrylic diffuser
IP Rating IP68 IP68 IP68 IP68 IP68 IP68
Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height 30.5 mm diameter, 37 mm height
Mass (with 5 m of cable) 140 g 140 g 140 g 140 g 140 g 140 g
Warranty 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship 4 years against defects in materials and workmanship

 

Quantum Light Pollution Sensor Videos
Apogee Instruments Quantum Light Pollution Sensor Videos

Predicting Stem Elongation and Leaf Expansion: Percent far-red is a better predictor than PPE

If you can't access the video via Youtube, click here.

Far-red: The Forgotten Photons

If you can't access the video via Youtube, click here.

Turning Photons Into Food

If you can't access the video via Youtube, click here.

Toward an Optimal Spectral Quality for Plant Growth and Development

If you can't access the video via Youtube, click here.

PAR, PPF, PPFD, and PFD Explained

Photobiology Simplified with Dr Bruce Bugbee

If you can't access the video via Youtube, click here.

 

Quantum Light Pollution Product Manuals
Product Manuals Icon
SQ-640-SS
SQ-642-SS
SQ-644-SS
SQ-645-SS
SQ-646
SQ-647-SS

 

Quantum Light Pollution Sensor Specification Sheets
Specification Sheets Icon

Quantum Light Pollution Spec Sheet (SQ-640 series) >

 

Quantum Light Pollution Sensor Technical Drawings
Technical Drawings Icon
SQ-640-SS
SQ-642-SS
SQ-644-SS
SQ-645-SS
SQ-646
SQ-647-SS

 

  Helpful Articles and Links

   Underwater Measurements: Applying an immersion effect correction factor

 

  FAQs

 What are the new in-line cable connectors?

 

Quantum Light Pollution Sensor Software & Datalogger Programs
Specification Sheets Icon
Sample Datalogger Programs

Programs are in .CR1X format and can be downloaded for use with Campbell Scientific dataloggers. Right click and select "Save target as..." or an equivalent command in your browser. They can also be viewed using Wordpad or other text viewers.

Note: In 2020 the CR1000 Campbell Scientific datalogger was discontinued. Click here to access the discontinued .CR1 format sample datalogger programs >

Quantum Sensor - Unamplified >
Quantum Sensor - Amplified >
Quantum Sensor - SDI-12 >

 

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PQ-640 Package: microCache and Quantum Light Pollution Sensor with 30 cm cable
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PQ-640 Package: microCache and Quantum Light Pollution Sensor with 30 cm cable

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SQ-640-SS Quantum Light Pollution Sensor
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SQ-640-SS Quantum Light Pollution Sensor

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SQ-642-SS 0-2.5 V output Quantum Light Pollution Sensor
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SQ-642-SS 0-2.5 V output Quantum Light Pollution Sensor

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SQ-644-SS 4-20 mA output Quantum Light Pollution Sensor
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SQ-644-SS 4-20 mA output Quantum Light Pollution Sensor

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SQ-645-SS 0-5 V output Quantum Light Pollution Sensor

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SQ-647-SS SDI-12 Quantum Light Pollution Sensor
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SQ-647-SS SDI-12 Quantum Light Pollution Sensor

$515.00
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    • Pyranometers
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