User Manual

SPECIFICATIONS
Calibration Traceability
Apogee SQ series quantum sensors are calibrated through side-by-side comparison to the mean of transfer
standard quantum sensors under a reference lamp. The reference quantum sensors are recalibrated with a 200 W
quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST).
SQ-100-SS Series
SQ-313/316/323/326-SS
SQ-311/321-SS
Power Supply
Self-powered
Sensitivity
0.2 mV per µmol m
-2
s
-1
Calibration Factor
(Reciprocal of Sensitivity)
5 µmol m
-2
s
-1
per mV
Calibration Uncertainty
± 5 % (see Calibration Traceability below)
Calibrated Output Range
0 to 800 mV
Measurement
Repeatability
Less than 0.5 %
Long-term Drift
(Non-stability)
Less than 2 % per year
Non-linearity
Less than 1 % (up to 4000 µmol m
-2
s
-1
)
Response Time
Less than 1 ms
Field of View
180°
Spectral Range
410 to 655 nm (wavelengths where response is greater than 50 % of maximum; see Spectral
Response below)
Spectral Selectivity
Less than 10 % from 469 to 655 nm
Directional (Cosine)
Response
± 5 % at 75° zenith angle (see Cosine Response below)
Temperature Response
0.06 ± 0.06 % per C (see Temperature Response below)
Operating Environment
-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions
24 mm diameter, 33 mm height
500 mm length, 15 mm width,
15 mm height
700 mm length, 15 mm
width, 15 mm height
Mass
90 g (with 5m of lead wire)
275 g
375 g
Cable
5 m of two conductor, shielded, twisted-pair wire; TPR jacket (high water resistance, high UV
stability, flexibility in cold conditions); pigtail lead wires; stainless steel (316), M8 connector
located 25 cm from sensor head