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ePAR and ePFD Sensor Support

Extended range PFD sensor support

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

 

Extended Range 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. Apogee's new 380-760 nm Extended Photosynthetically Active Radiation (ePAR) and 340-1040 nm Extended Photon Flux Density (ePFD) sensors are designed for making total photon intensity measurements of wider ranges than traditional PAR sensors that measure 400-700 nm.

 

ePAR Sensor Specifications
Apogee Instruments ePAR Sensor Specifications
  SQ-610-SS SQ-612-SS SQ-614-SS SQ-615-SS SQ-616 SQ-617-SS SQ-618-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 5.5 to 24 V DC
Current Draw - at 12 V is 57 µA Maximum of 20 mA at 12 V is 57 µA 61 mA when logging 1.4 mA (quiescent), 1.8 mA (active) RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA
Sensitivity 0.01 mV per µmol m-2 s-1 0.625 mV per µmol m-2 s-1 0.004 mA per µmol m-2 s-1 1.25 mV per µmol m-2 s-1 - - -
Output Type 0 to 40 mV 0 to 2.5 V 4 to 20 mA 0 to 5 V USB SDI-12 Modbus
Resolution - - - - 0.1 µmol m-2 s-1 - -
Calibration Factor 100 µmol m-2 s-1 per mV 1.6 µmol m-2 s-1 per mV 250 µmol m-2 s-1 per mA 0.8 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 Custom for each sensor and stored in the firmware
Calibration Uncertainty ± 5 % ± 5 % ± 5 % ± 5 % ± 5 % ± 5 % ± 5 %
Measurement Range 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 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 % 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 Less than 2 % per year
Non-linearity Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 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° 180°
Spectral Range 380 to 760 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 380 to 760 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 380 to 760 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 380 to 760 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 380 to 760 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 380 to 760 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) 380 to 760 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 ± 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 % 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 % 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 -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 % 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 Anodized aluminum body with acrylic diffuser
IP Rating IP68 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 -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 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 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 4 years against defects in materials and workmanship

 

ePFD Sensor Specifications
Apogee Instruments ePFD Sensor Specifications
  SQ-620-SS SQ-622-SS SQ-624-SS SQ-625-SS SQ-626 SQ-627-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 - at 12 V is 57 µA Maximum of 20 mA at 12 V is 57 µA 61 mA when logging 1.4 mA (quiescent), 1.8 mA (active)
Sensitivity 0.05 mV per µmol m-2 s-1 0.625 mV per µmol m-2 s-1 0.004 mA per µmol m-2 s-1 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 20 µmol m-2 s-1 per mV 1.6 µmol m-2 s-1 per mV 250 µmol m-2 s-1 per mA 0.8 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 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 µmol m-2 s-1 0 to 4000 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 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 µmol m-2 s-1) Less than 1 % (up to 4000 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

 

ePAR and ePFD Sensor Videos
Apogee Instruments Extended Range PFD Sensor Videos

ePAR and ePFD Explained with Dr. Bruce Bugbee

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.

 

ePAR and ePFD Product Manuals
Product Manuals Icon
SQ-610-SS
SQ-612-SS
SQ-614-SS
SQ-615-SS
SQ-616
SQ-617-SS
SQ-618-SS
MQ-610
SQ-620-SS
SQ-622-SS
SQ-624-SS
SQ-625-SS
SQ-626
SQ-627-SS
MQ-620

 

ePAR and ePFD Sensor Specification Sheets
Specification Sheets Icon

ePAR Spec Sheet (SQ-610 Series) >
ePFD Spec Sheet (SQ-620 Series) >

 

ePAR and ePFD Sensor Technical Drawings
Technical Drawings Icon
SQ-610-SS
SQ-612-SS
SQ-614-SS
SQ-615-SS
SQ-616
SQ-617-SS
SQ-618-SS
MQ-610
SQ-620-SS
SQ-622-SS
SQ-624-SS
SQ-625-SS
SQ-626
SQ-627-SS
MQ-620

 

  Helpful Articles and Links

 Embracing a new understanding of PAR

 Far-red photons have equivalent efficiency to traditional photosynthetic photons: Implications for redefining photosynthetically active radiation

 Substituting Far-Red for Traditionally Defined Photosynthetic Photons Results in Equal Canopy Quantum Yield for CO2 Fixation and Increased Photon Capture During Long-Term Studies: Implications for Re-Defining PAR

 Redefining the McCree Curve at Utah State University

 Underwater Measurements: Applying an immersion effect correction factor

 

  FAQs

 What are the new in-line cable connectors?

 

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

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

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PQ-620 Package: microCache and ePFD sensor with 30 cm cable
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PQ-620 Package: microCache and ePFD sensor with 30 cm cable

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PQ-622 Package: microCache and ePFD Sensor with 2 meter cable
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PQ-622 Package: microCache and ePFD Sensor with 2 meter cable

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MQ-610: 380-760 nm ePAR Meter
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MQ-610: 380-760 nm ePAR Meter

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MQ-620: 340-1040 nm ePFD Meter
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MQ-620: 340-1040 nm ePFD Meter

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SQ-610-SS 380-760 nm ePAR Sensor
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SQ-610-SS 380-760 nm ePAR Sensor

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SQ-612-SS 380-760 nm 0-2.5 V output ePAR Sensor
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SQ-612-SS 380-760 nm 0-2.5 V output ePAR Sensor

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SQ-614-SS 380-760 nm 4-20 mA output ePAR Sensor
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SQ-614-SS 380-760 nm 4-20 mA output ePAR Sensor

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SQ-615-SS 380-760 nm 0-5 V output ePAR Sensor
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SQ-615-SS 380-760 nm 0-5 V output ePAR Sensor

$460.00
SQ-616: 380-760 nm USB output ePAR Sensor
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SQ-616: 380-760 nm USB output ePAR Sensor

$465.00
SQ-617-SS 380-760 nm SDI-12 ePAR Sensor
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SQ-617-SS 380-760 nm SDI-12 ePAR Sensor

$515.00
SQ-618-SS Modbus Digital Output 380-760 nm ePAR Sensor
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SQ-618-SS Modbus Digital Output 380-760 nm ePAR Sensor

$515.00
SQ-620-SS 340-1040 nm ePFD Sensor
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SQ-620-SS 340-1040 nm ePFD Sensor

$415.00
SQ-622-SS 340-1040 nm 0-2.5 V output ePFD Sensor
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SQ-622-SS 340-1040 nm 0-2.5 V output ePFD Sensor

$460.00
SQ-624-SS 340-1040 nm 4-20 mA output ePFD Sensor
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SQ-624-SS 340-1040 nm 4-20 mA output ePFD Sensor

$515.00
SQ-625-SS 340-1040 nm 0-5 V output ePFD Sensor
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SQ-625-SS 340-1040 nm 0-5 V output ePFD Sensor

$460.00
SQ-626: 340-1040 nm USB output ePFD Sensor
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SQ-626: 340-1040 nm USB output ePFD Sensor

$465.00
SQ-627-SS 340-1040 nm SDI-12 ePFD Sensor
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SQ-627-SS 340-1040 nm SDI-12 ePFD Sensor

$515.00
AA-100: Protective Carrying Case
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AA-100: Protective Carrying Case

$24.00
AL-100: Solar Sensor Leveling Plate
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AL-100: Solar Sensor Leveling Plate

$44.00
AL-120 Solar Mounting Bracket with Leveling Plate
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AL-120 Solar Mounting Bracket with Leveling Plate

$64.00
AM-310: Sensor Wand
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AM-310: Sensor Wand

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    • Spectroradiometers
    • Net Radiometer
    • Pyrgeometers
    • Humidity Probes
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    • Leaf and Bud Temperature Sensor
    • Oxygen Sensors
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