Apogee Instrument's full-spectrum quantum sensors/meters provide a research grade measurement of photosynthetically active radiation (PAR), PPF, and PPFD. — Accurately measure photosynthetically active radiation in µmol m^-2 s^-1.

Apogee Instruments' full-spectrum quantum PAR sensors and PAR meters are the industry standard for accurately measuring photosynthetically active radiation (PAR or PPFD) from all light sources used to grow plants and corals.

Spectral Response

Our full-spectrum quantum PAR sensors and PAR meters have a highly optimized photo detector that accurately measures the photosynthetic radiation spectral range of 400 to 700 nm. These are our top of the line models that measure accurately under all light sources including narrow-band LEDs. The exact spectral response of our full-spectrum models can be seen in the graph below.

Accurate, Stable Measurements

Sensors are cosine-corrected to maintain their accuracy when radiation comes from low zenith angles. The sensors measure PPFD with a cosine response accurate within ± 5 % at 75° zenith angle. Long-term non-stability determined from multiple replicate quantum sensors in accelerated aging test and field conditions is less than 2 % per year.

Typical Applications

PPFD measurements over plant canopies in outdoor environments, greenhouses, growth chambers, and reflected or under canopy (transmitted) PPFD measurements in the same environments. Apogee Quantum sensors can also be used to measure PPFD in aquatic environments, including salt water aquariums where coral reefs are grown.

Rugged, Self-cleaning Housing

The patented domed shaped sensor head sheds dew, rain, and dust to keep the sensor clean and minimize errors. Sensor housings are made from rugged anodized aluminum and filled with electronics-grade epoxy potting compound to prevent any water ingress.

Calibration

To ensure accuracy, each sensor is carefully calibrated for all light sources in controlled conditions that are traceable to NIST reference standards.

Ideal for Measurements in Both Air and Water

All Apogee quantum sensor heads are waterproof. Most sensors are calibrated to make absolute PPFD measurements in air, while some are specially calibrated to make measurements underwater by applying an immersion correction factor. For details on making underwater measurements, please refer to Underwater PAR Measurements.

Mounting

The AL-120 Solar Mounting Bracket with Leveling Plate makes mounting the sensor to a mast or pipe easy. The AL-100 Solar Sensor Leveling Plate is designed to level the sensor while sitting on a flat surface or mounting to other fixtures.

Output Options

Handheld Meter Options:
MQ-500
MQ-501
MQ-510 (underwater)

Pigtail Analog Outputs:
0 to 40 mV
0 to 2.5 V
0 to 5 V
4 to 20 mA

Digital Outputs:
Modbus (pigtail)
SDI-12 (pigtail)
USB

µCache Packages:
PQ-500 Package: SQ-500 model (30 cm cable) with Apogee's µCache Bluetooth Micro Logger
PQ-510 Package: SQ-500-SS2 model (2 m cable) with Apogee's µCache Bluetooth Micro Logger

High-Quality Cable

Pigtail sensors feature an IP68, marine-grade stainless-steel cable connector to simplify sensor removal for maintenance and recalibration. Cable is shielded-twisted-pair wire with a TPR jacket for high water resistance, UV stability, and flexibility in cold conditions.

Warranty and Support

All Apogee products are backed by an industry-leading four year warranty and outstanding customer support.

Specifications
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Videos
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Case Studies
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Support Info
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Graph showing the spectral responses of full-spectrum quantum sensor (spectral range of 389 to 692 nm ± 5 nm). — Accurately measure photosynthetically active radiation in µmol m^-2 s^-1.

Apogee Instruments' full-spectrum quantum PAR sensors and PAR meters are the industry standard for accurately measuring photosynthetically active radiation (PAR or PPFD) from all light sources used to grow plants and corals.

Spectral Response

Our full-spectrum quantum PAR sensors and PAR meters have a highly optimized photo detector that accurately measures the photosynthetic radiation spectral range of 400 to 700 nm. These are our top of the line models that measure accurately under all light sources including narrow-band LEDs. The exact spectral response of our full-spectrum models can be seen in the graph below.

Accurate, Stable Measurements

Sensors are cosine-corrected to maintain their accuracy when radiation comes from low zenith angles. The sensors measure PPFD with a cosine response accurate within ± 5 % at 75° zenith angle. Long-term non-stability determined from multiple replicate quantum sensors in accelerated aging test and field conditions is less than 2 % per year.

Typical Applications

PPFD measurements over plant canopies in outdoor environments, greenhouses, growth chambers, and reflected or under canopy (transmitted) PPFD measurements in the same environments. Apogee Quantum sensors can also be used to measure PPFD in aquatic environments, including salt water aquariums where coral reefs are grown.

Rugged, Self-cleaning Housing

The patented domed shaped sensor head sheds dew, rain, and dust to keep the sensor clean and minimize errors. Sensor housings are made from rugged anodized aluminum and filled with electronics-grade epoxy potting compound to prevent any water ingress.

Calibration

To ensure accuracy, each sensor is carefully calibrated for all light sources in controlled conditions that are traceable to NIST reference standards.

Ideal for Measurements in Both Air and Water

All Apogee quantum sensor heads are waterproof. Most sensors are calibrated to make absolute PPFD measurements in air, while some are specially calibrated to make measurements underwater by applying an immersion correction factor. For details on making underwater measurements, please refer to Underwater PAR Measurements.

Mounting

The AL-120 Solar Mounting Bracket with Leveling Plate makes mounting the sensor to a mast or pipe easy. The AL-100 Solar Sensor Leveling Plate is designed to level the sensor while sitting on a flat surface or mounting to other fixtures.

Output Options

Handheld Meter Options:
MQ-500
MQ-501
MQ-510 (underwater)

Pigtail Analog Outputs:
0 to 40 mV
0 to 2.5 V
0 to 5 V
4 to 20 mA

Digital Outputs:
Modbus (pigtail)
SDI-12 (pigtail)
USB

µCache Packages:
PQ-500 Package: SQ-500 model (30 cm cable) with Apogee's µCache Bluetooth Micro Logger
PQ-510 Package: SQ-500-SS2 model (2 m cable) with Apogee's µCache Bluetooth Micro Logger

High-Quality Cable

Pigtail sensors feature an IP68, marine-grade stainless-steel cable connector to simplify sensor removal for maintenance and recalibration. Cable is shielded-twisted-pair wire with a TPR jacket for high water resistance, UV stability, and flexibility in cold conditions.

Warranty and Support

All Apogee products are backed by an industry-leading four year warranty and outstanding customer support.

Specifications
Learn More

Videos
Learn More

Case Studies
Learn More

Support Info
Learn More

PQ-500 Package: microCache and Full-spectrum Quantum with 30 cm cable

PQ-500 Package: microCache and Full-spectrum Quantum with 30 cm cable

$619.00

MQ-500: Full-Spectrum Quantum Meter

MQ-500: Full-Spectrum Quantum Meter

$549.00

MQ-510: Full-Spectrum Underwater Quantum Meter

MQ-510: Full-Spectrum Underwater Quantum Meter

$559.00

DLI-500: PAR, Daily Light Integral, and Photoperiod Meter (Full-Spectrum, 400-700 nm)

DLI-500: PAR, Daily Light Integral, and Photoperiod Meter (Full-Spectrum, 400-700 nm)

$499.00

Apogee Instruments SQ-514 Full-spectrum Quantum Sensor

SQ-514-SS: Full-Spectrum 4-20 mA output

$509.00

SQ-521 SDI-12 Digital Output Full-spectrum Quantum Sensor

SQ-521-SS SDI-12 Digital Output Full-spectrum Quantum Sensor

$599.00

Apogee Instruments SQ-522 Full-spectrum Quantum Sensor

SQ-522-SS Modbus Digital Output Full-spectrum Quantum Sensor

$614.00

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