Apogee Instrument's ePAR sensors/meters provide a research grade measurement of photon flux density (PFD) beyond the standard range of 400-700 nm (PAR). — Apogee's newest 400-750 nm **Extended Photosynthetically Active Radiation (ePAR)** sensor is designed for making total photon flux intensity measurements of wider ranges than traditional PAR sensors that measure 400-700 nm.

Apogee's newest, cutting-edge **ePAR** sensor was created in 2021 as an upgrade to our ePFD sensor and designed to measure the newly defined 400-750 nm ePAR radiation range that research has shown to be photosynthetically active, beyond the traditional 400-700 nm range (read article here >). Many next generation LED fixtures, the sun, and other light sources emit these newly confirmed Far-red photosynthetic wavelengths, but they have not been measurable by traditional 400-700 nm PAR meters until now. Much of the transformative work to define the ePAR range was conducted by Dr. Shuyang Zhen and Dr. Bruce Bugbee at Utah State University's Crop Physiology Laboratory. A few of the many articles discussing Dr. Zhen and Dr. Bugbee's research into ePAR can be found in Greenhouse Management, Plant, Cell and Environment, Frontiers in Plant Science, and at Fluence.

The **ePFD** sensor series (SQ-620-SS) was retired May 19, 2021. For more details click here >

ePAR Explained with Dr. Bruce Bugbee

Spectral Response

The **ePAR sensor** has a spectral range of 400 to 750 nm ± 5 nm. The spectral response 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 PFD 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

Total ePAR intensity measurements over plant canopies in all growing environments, monitor and adjust grow lights, research plant morphogenic activity, and photobiology studies.

Rugged, Self-cleaning Housing

Patented domed shaped sensor head (diffuser and body) facilitate runoff of dew and rain to keep the sensor clean and minimize errors caused by dust blocking the radiation path. Sensors are housed in a rugged anodized aluminum body and electronics are fully potted.

Calibration

To ensure accuracy each sensor is carefully calibrated in controlled conditions and traceable to NIST reference standards. ePAR sensors are pre-calibrated for all light sources.

Mounting

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

Output Options

Available in multiple analog output options including 0 to 40 mV, 0 to 2.5 V, 0 to 5 V, and 4 to 20 mA ranges. Digital output options include a digital “smart” sensor that uses USB communication and custom software to interface directly to a computer, SDI-12, and Modbus protocols. Sensors are also available attached to a hand-held meter with digital readout. The analog version (SQ-610) works with our µCache Bluetooth Micro Logger.

High Quality Cable

Pigtail-lead 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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Graph showing the spectral response of an ePAR and Extended Range PFD sensor — Apogee's newest 400-750 nm **Extended Photosynthetically Active Radiation (ePAR)** sensor is designed for making total photon flux intensity measurements of wider ranges than traditional PAR sensors that measure 400-700 nm.

Apogee's newest, cutting-edge **ePAR** sensor was created in 2021 as an upgrade to our ePFD sensor and designed to measure the newly defined 400-750 nm ePAR radiation range that research has shown to be photosynthetically active, beyond the traditional 400-700 nm range (read article here >). Many next generation LED fixtures, the sun, and other light sources emit these newly confirmed Far-red photosynthetic wavelengths, but they have not been measurable by traditional 400-700 nm PAR meters until now. Much of the transformative work to define the ePAR range was conducted by Dr. Shuyang Zhen and Dr. Bruce Bugbee at Utah State University's Crop Physiology Laboratory. A few of the many articles discussing Dr. Zhen and Dr. Bugbee's research into ePAR can be found in Greenhouse Management, Plant, Cell and Environment, Frontiers in Plant Science, and at Fluence.

The **ePFD** sensor series (SQ-620-SS) was retired May 19, 2021. For more details click here >

ePAR Explained with Dr. Bruce Bugbee

Spectral Response

The **ePAR sensor** has a spectral range of 400 to 750 nm ± 5 nm. The spectral response 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 PFD 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

Total ePAR intensity measurements over plant canopies in all growing environments, monitor and adjust grow lights, research plant morphogenic activity, and photobiology studies.

Rugged, Self-cleaning Housing

Patented domed shaped sensor head (diffuser and body) facilitate runoff of dew and rain to keep the sensor clean and minimize errors caused by dust blocking the radiation path. Sensors are housed in a rugged anodized aluminum body and electronics are fully potted.

Calibration

To ensure accuracy each sensor is carefully calibrated in controlled conditions and traceable to NIST reference standards. ePAR sensors are pre-calibrated for all light sources.

Mounting

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

Output Options

Available in multiple analog output options including 0 to 40 mV, 0 to 2.5 V, 0 to 5 V, and 4 to 20 mA ranges. Digital output options include a digital “smart” sensor that uses USB communication and custom software to interface directly to a computer, SDI-12, and Modbus protocols. Sensors are also available attached to a hand-held meter with digital readout. The analog version (SQ-610) works with our µCache Bluetooth Micro Logger.

High Quality Cable

Pigtail-lead 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

Support Info
Learn More

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/ Quantum (PAR & ePAR) Sensors / Meters
/ ePAR Sensors

PQ-612 Package: microCache and ePAR Sensor with 2 meter cable

$639.00

PQ-610 Package: microCache and ePAR sensor with 30 cm cable

$619.00

MQ-610: 400-750 nm ePAR Meter

$568.00

MQ-650: ePAR Underwater Meter

$568.00

SQ-610-SS 400-750 nm ePAR Sensor

$415.00

SQ-612-SS 400-750 nm 0-2.5 V output ePAR Sensor

$460.00

SQ-614-SS 400-750 nm 4-20 mA output ePAR Sensor

$515.00

SQ-615-SS 400-750 nm 0-5 V output ePAR Sensor

$460.00

SQ-616: 400-750 nm USB output ePAR Sensor

$465.00

SQ-617-SS 400-750 nm SDI-12 ePAR Sensor

$515.00

SQ-618-SS Modbus Digital Output 400-750 nm ePAR Sensor

$515.00

AT-100 microCache Bluetooth Micro Logger

$319.00

AA-100: Protective Carrying Case

$24.00

AL-120 Solar Mounting Bracket with Leveling Plate

$64.00

AL-100: Solar Sensor Leveling Plate

$44.00

AM-310: Sensor Wand

$62.00

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ePAR Sensors

The ePFD sensor series (SQ-620-SS) was retired May 19, 2021. For more details click here >

Specifications

Videos

Support Info

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PQ-612 Package: microCache and ePAR Sensor with 2 meter cable

PQ-610 Package: microCache and ePAR sensor with 30 cm cable

MQ-610: 400-750 nm ePAR Meter

MQ-650: ePAR Underwater Meter

SQ-610-SS 400-750 nm ePAR Sensor

SQ-612-SS 400-750 nm 0-2.5 V output ePAR Sensor

SQ-614-SS 400-750 nm 4-20 mA output ePAR Sensor

SQ-615-SS 400-750 nm 0-5 V output ePAR Sensor

SQ-616: 400-750 nm USB output ePAR Sensor

SQ-617-SS 400-750 nm SDI-12 ePAR Sensor

SQ-618-SS Modbus Digital Output 400-750 nm ePAR Sensor

AT-100 microCache Bluetooth Micro Logger

AA-100: Protective Carrying Case

AL-120 Solar Mounting Bracket with Leveling Plate

AL-100: Solar Sensor Leveling Plate

AM-310: Sensor Wand