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

Updated:2025-03-13

Brand: Apogee
Model:SQ-514-SS
Description: The SQ-514 is an amplified full-spectrum quantum sensor with a 4 to 20 mA output. The sensor was designed for use in environments with significant background electrical noise that can be found in many
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Product Details

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

User 's Manual

The SQ-514 is an amplified full-spectrum quantum sensor with a 4 to 20 mA output. The sensor was designed for use in environments with significant background electrical noise that can be found in many industrial applications. The sensor features a rugged, self-cleaning sensor housing design, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include PPFD (Photosynthetic Photon Flux Density) measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments. Quantum sensors are also used to measure PAR (Photosynthetically Active Radiation)/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

SQ-514-SS drawing:

SQ-514-SS specification:

Power Supply	12 to 24 V DC
Current Draw	maximum of 20 mA
Output (sensitivity)	0.004 mA per μmol mˉ2 sˉ1
Calibration Factor	250 μmol mˉ2 sˉ1 per mA
Calibration Uncertainty	± 5 %
Output Range	4 to 20 mA
Measurement Repeatability	Less than 0.5 %
Long-term Drift	Less than 2 % per year
Non-linearity	Less than 1 % (up to 4000 μmol mˉ2 sˉ1)
Response Time	Less than 1 ms
Field of View	180?
Spectral Range	391 to 695 nm ± 5 nm (wavelegths where response is greater than 50 % of maximum)
Spectral Range	389 to 692 nm ± 5 nm (wavelegths where response is greater than 50 % of maximum)
Spectral Selectivity	Less than 10 % from 412 to 682 nm ± 5 nm
Directional (Cosine) Response	± 2 % at 45? zenith angle, ± 5 % at 75?zenith angle
Azimuth Error	Less than 0.5 %
Tilt Error	Less than 0.5 %
Temperature Response	-0.1 % per C
Uncertainty in Daily Total	Less than 5 %
Detector	Blue-enhanced silicon photodiode
Housing	Anodized aluminum body with acrylic diffuser
IP Rating	IP68
Operating Environment	-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
Mass (with 5 m of cable)	140 g
Cable	5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel (316), M8 connector
Warranty	4 years against defects in materials and workmanship
Manufactured	Made in the USA