:: Product Information

SQ-500: Full Spectrum Quantum Sensor

Quantum Sensors

Refined Spectral Response

The improved spectral response of the 
SQ-500 increases the accuracy of LED measurements making it ideal for use with both natural and electric light sources.

Cosine Response

This cosine-corrected sensor is designed to maintain its accuracy when radiation comes from low zeith angles. The sensors measure PPFD with a cosine response accurate within 

± 5 % at 75 ° zenith angle.


The New Full Spectrum Quantum Sensor is available as an unamplified analog version with pigtail leads to be connected to a datalogger. (Shown with optional AL-100 leveling plate)


Power Supply:


Output (Sensitivity):

0.01 mV per μmol m-2 s-1

Calibration Factor (Reciprocal of Output):

100.0 μmol m-2 s-1

Calibration Uncertainty:

± 5 %

Output Range:

0 to 40 mV

Measurement Range:

0 to 4000 μmol m-2 s-1

Measurement Repeatability:

less than 0.5 %

Long-term Drift:

less than 2 % per year


less than 1 % (up to 4000 μmol m-2 s-1)

Response Time:

less than 1 ms

Field of View:


Spectral Range:

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

Spectral Selectivity:

less than 10 % from 412 to 682 nm ± 5 nm

Directional (Cosine) Response:

± 5 % at 75°

Azimuth Error:

less than 0.5 %

Tilt Error:

less than 0.5 %

Temperature Response:

-0.11 ± 0.03 % per C

Uncertainty in Daily Total:

less than 5 %


blue-enhanced silicon photodiode


anodized aluminum body with acrylic diffuser

IP Rating:


Operating Environment:

-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m


24 mm diameter; 37 mm height


100 g (with 5 m of lead wire)


5 m of shielded, twisted-pair wire; additional cable available in multiples of 5 m; santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires


4 years against defects in materials and workmanship

related products

Inquiry online

Dianjiang Group Limited
Add: Room 1510,15/F,New Commerce Centre, No.19 On Sum Street, Shatin, N.T., Hong Kong.
Tel: (852) 3690 1588   Fax: (852) 3690 1586
Email: Dianjiang_HK@yahoo.com.hk   Hongkong@Dianjiangtech.com
© Dianjiang Group Limited All Rights Reserved.