Apogee - Model Full-Spectrum Quatum Par Meter -Accurately Measure Photosynthetically Active Radiation

Apogee Instruments Quantum Sensors are the tool of choice for researchers and agricultural professionals measuring photosynthetically active radiation (PAR) all over the world. Apogee offers two types of quantum sensors: a Full-spectrum Quantum and Original X Quantum Sensor. Consult our spectral response graph to decide which model is right for your application.

Cost-effective, original quantum sensors work well for broadband radiation sources (sun, high-pressure sodium, metal halide, cool white f luorescent lamps), while full-spectrum sensors are good for all light sources, including LEDs. Offers a self-cleaning, cosine-corrected head that is fully-potted for a waterproof design.

• Incoming and reflected PPFD over and under plant canopies in greenhouses, in fields, and in growth chambers
• Aquatic environments including salt water aquariums and freshwater lakes and streams

Apogee SQ series quantum sensors are calibrated through side-by-side comparison to the mean of four transfer standard sensors under a reference lamp. The reference sensors are recalibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST).

• 0 to 40 mV
• 0 to 5 V
• USB
• Modbus
• 0 to 2.5 V
• 4 to 20 mA
• SDI-12
• or hand-held meter

Power Supply

• SQ-500-SS: Self-powered
• SQ-512-SS: 5 to 24 V DC
• SQ-514-SS: 12 to 24 V DC
• SQ-515-SS: 5.5 to 24 V DC
• SQ-520: 5 V USB power source
• SQ-521-SS: 5.5 to 24 V DC
• SQ-522-SS: 5.5 to 24 V DC

Current Draw

• SQ-500-SS: -
• SQ-512-SS: At 12 V is 57 μA
• SQ-514-SS: maximum of 20 mA
• SQ-515-SS: At 12 V is 57 μA
• SQ-520: 61 mA when logging
• SQ-521-SS: 1.4 mA (quiescent), 1.8 mA (active)
• SQ-522-SS: RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA

Output (sensitivity)

• SQ-500-SS: 0.01 mV per μmol m⁻² s⁻¹
• SQ-512-SS: 0.625 mV per μmol m⁻² s⁻¹
• SQ-514-SS: 0.004 mA per μmol m⁻² s⁻¹
• SQ-515-SS: 1.25 mV per μmol m⁻² s⁻¹
• SQ-520: -
• SQ-521-SS: -
• SQ-522-SS: -

Resolution

• -
• SQ-520: 0.1 μmol m⁻² s⁻¹

Calibration Factor (reciprocal of output)

• SQ-500-SS: 100 μmol m⁻² s⁻¹ per mV
• SQ-512-SS: 1.6 μmol m⁻² s⁻¹ per mV
• SQ-514-SS: 250 μmol m⁻² s⁻¹ per mA
• SQ-515-SS: 0.8 μmol m⁻² s⁻¹ per mV
• SQ-520: Custom for each sensor and stored in the firmware
• SQ-521-SS: Custom for each sensor and stored in the firmware
• SQ-522-SS: Custom for each sensor and stored in the firmware

Calibration Uncertainty

• ± 5 %

Output Range

• SQ-500-SS: 0 to 40 mV
• SQ-512-SS: 0 to 2.5 V
• SQ-514-SS: 4 to 20 mA
• SQ-515-SS: 0 to 5 V
• SQ-520: USB
• SQ-521-SS: SDI-12
• SQ-522-SS: Modbus

Measurement Repeatability

• Less than 0.5 %

Long-term Drif

• Less than 2 % per year

Non-linearity

• Less than 1 % (up to 4000 μmol m⁻² s⁻¹)

Response Time

• SQ-500-SS: Less than 1 ms
• SQ-512-SS: Less than 1 ms
• SQ-514-SS: Less than 1 ms
• SQ-515-SS: Less than 1 ms
• SQ-520: Software updates every second
• SQ-521-SS: Less than 0.6 s
• SQ-522-SS: Less than 200 ms

Field of View

• 180°

Spectral Range

• 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %)

Directional (cosine) Response

• ± 5 % at 75° zenith angle

Temperature Response

• -0.11 ± 0.04 % 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

• SQ-500-SS: 24 mm diameter, 37 mm height
• SQ-512-SS: 30.5 mm diameter, 37 mm height
• SQ-514-SS: 30.5 mm diameter, 37 mm height
• SQ-515-SS: 30.5 mm diameter, 37 mm height
• SQ-520: 24 mm diameter, 37 mm height
• SQ-521-SS: 30.5 mm diameter, 37 mm height
• SQ-522-SS: 30.5 mm diameter, 37 mm height

Mass (5 m of cable)

• SQ-500-SS: 100 g
• SQ-512-SS: 140 g
• SQ-514-SS: 140 g
• SQ-515-SS: 140 g
• SQ-520: 100 g
• SQ-521-SS: 140 g
• SQ-522-SS: 140 g

Warranty

• 4 years against defects in materials and workmanship

• 0 to 400 mV
• 0 to 2.5 V
• 0 to 5 V
• 4 to 20 mA
• USB
• SDI-12
• Modbus
• or hand-held meter

Power Supply

• SQ-100X-SS: Self-powered
• SQ-202X-SS: 5 to 24 V DC
• SQ-204X-SS: 7 to 24 V DC
• SQ-205X-SS: 5.5 to 24 V DC
• SQ-420X: 5 V USB power source
• SQ-421X-SS: 5.5 to 24 V DC
• SQ-422X-SS: 5.5 to 24 V DC

Current Draw

• SQ-100X-SS: -
• SQ-202X-SS: 10 μA
• SQ-204X-SS: 22 mA maximum; 2 mA quiescent
• SQ-205X-SS: 10 μA
• SQ-420X: 61 mA when logging
• SQ-421X-SS: 1.4 mA (quiescent), 1.8 mA (active)
• SQ-422X-SS: RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA

Output (sensitivity)

• SQ-100X-SS: 0.1 mV per μmol m⁻² s⁻¹
• SQ-202X-SS: 1 mV per μmol m⁻² s⁻¹
• SQ-204X-SS: 0.004 mA per μmol m⁻² s⁻¹
• SQ-205X-SS: 2 mV per μmol m⁻² s⁻¹
• SQ-420X: -
• SQ-421X-SS: -
• SQ-422X-SS: -

Calibration Factor (reciprocal of output)

• SQ-100X-SS: 10 μmol m⁻² s⁻¹ per mV
• SQ-202X-SS: 1 μmol m⁻² s⁻¹ per mV
• SQ-204X-SS: 250 μmol m⁻² s⁻¹ per mA
• SQ-205X-SS: 0.5 μmol m⁻² s⁻¹ per mV
• SQ-420X: Custom for each sensor and stored in the firmware
• SQ-421X-SS: Custom for each sensor and stored in the firmware
• SQ-422X-SS: Custom for each sensor and stored in the firmware

Calibration for Uncertainty

• ± 5 %

Output Range

• SQ-100X-SS: 0 to 250 mV
• SQ-202X-SS: 0 to 2.5 V
• SQ-204X-SS: 4 to 20 mA
• SQ-205X-SS: 0 to 5 V
• SQ-420X: USB
• SQ-421X-SS: SDI-12
• SQ-422X-SS: Modbus

Measurement Repeatability

• Less than 0.5 %

Long-term Drif

• Less than 2 % per year

Non-linearity

• Less than 1 % (up to 2500 μmol m⁻² s⁻¹)

Response Time

• SQ-100X-SS: Less than 1 ms
• SQ-202X-SS: Less than 1 ms
• SQ-204X-SS: Less than 1 ms
• SQ-205X-SS: Less than 1 ms
• SQ-420X: Software updates every second
• SQ-421X-SS: Less than 0.6 s
• SQ-422X-SS: Less than 200 ms

Field of View

• 180°

Spectral Range

• 370 to 650 nm (wavelengths where response is greater than 50 % maximum)

Directional (cosine) Response

• ± 5 % at 75° zenith angle

Temperature Response

• -0.04 % per C
  

Operating Environment

• -10 to 60 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m

Dimensions

• SQ-100X-SS: 24 mm diameter, 33 mm height
• SQ-202X-SS: 30.5 mm diameter, 37 mm height
• SQ-204X-SS: 30.5 mm diameter, 37 mm height
• SQ-205X-SS: 30.5 mm diameter, 37 mm height
• SQ-420X: 24 mm diameter, 33 mm height
• SQ-421X-SS: 30.5 mm diameter, 37 mm height
• SQ-422X-SS: 30.5 mm diameter, 37 mm height

Mass (5 m of cable)

• SQ-100X-SS: 90 g
• SQ-202X-SS: 140 g
• SQ-204X-SS: 140 g
• SQ-205X-SS: 140 g
• SQ-420X: 90 g
• SQ-421X-SS: 140 g
• SQ-422X-SS: 140 g

Warranty

• 4 years against defects in materials and workmanship