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SQ-645-SS 0-5V output Quantum Light Pollution Sensor

Updated:2023-01-12

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  • Brand: Apogee
  • Model: SQ-645-SS
  • Description: The SQ-645 Quantum Light Pollution is an amplified sensor with a 0 to 5 V output. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions, and.
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Product Details

Overview of SQ-645-SS 0-5V output Quantum Light Pollution Sensor:

User's Manual

The SQ-645 Quantum Light Pollution is an amplified sensor with a 0 to 5 V output. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor cable includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement from permanent installations for maintenance and calibration. Typical applications of Quantum Light Pollution sensors include incoming PFD measurements over plant canopies in indoor greenhouses or in growth chambers, and reflected or under-canopy (transmitted) PFD measurements in the same environments.







The analog version of this sensor (SQ-640) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the microCache.

SQ-645-SS Sensor Drawing:

Specifications of SQ-645-SS:

Power Supply 5.5 to 24 V DC
Current Draw 12V is 57 µA
Sensitivity 25 mV per µmol mˉ² sˉ¹
Calibration Factor 0.04 µmol mˉ² sˉ¹ mV per
Calibration Uncertainty ± 5 %
Output Range 0 to 5 V
Measurement Range 0 to 200 µmol mˉ² sˉ¹
Measurement Repeatability Less than 0.5 %
Long-term Drift (Non-stability) Less than 2 % per year
Non-linearity Less than 1 % (up to 200 µmol mˉ² sˉ¹)
Response Time Less than 1 ms
Field of View 180˚
Spectral Range 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 %)
Directional (Cosine) Response ± 2 % at 45°, ± 5 % at 75° zenith angle
Azimuth Error Less than 0.5 %
Tilt Error Less than 0.5 %
Temperature Response -0.11 ± 0.04 % per C
Uncertainty in Daily Total Less than 5 %
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

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