Specifications - Apogee SQ-640 Owner's Manual

SPECIFICATIONS

Power Supply
Sensitivity
Calibration Factor
Calibration Uncertainty
Measurement Range
Measurement
Repeatability
Calibrated Output Range
Long-term Drift
(Non-stability)
Non-linearity
Response Time
Field of View
Spectral Range
Directional (Cosine)
Response
Azimuth Error
Tilt Error
Temperature Response
Uncertainty in Daily Total
Housing
IP Rating
Operating Environment
Dimensions
Mass (with 5 m of cable)
Cable
Warranty
Calibration Traceability
Apogee Instruments SQ-600 series quantum light pollution sensors are calibrated through side-by-side comparison
to the mean of four transfer standard quantum light pollution sensors under a reference lamp. The transfer
standard quantum light pollution sensors are recalibrated with a quartz halogen lamp traceable to the National
Institute of Standards and Technology (NIST).
± 5 % (see Calibration Traceability below)
340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 %; see Spectral
± 2 % at 45° zenith angle, ± 5 % at 75° zenith angle (see Directional Response below)
Anodized aluminum body with acrylic diffuser
-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel
(316), M8 connector located 25 cm from sensor head
4 years against defects in materials and workmanship
SQ-640-SS
Self-powered
-2
1 mV per µmol m
-2 -1
1 µmol m s per mV
-2
0 to 200 µmol m
Less than 0.5 %
0 to 200 mV
Less than 2 % per year
Less than 1 % (up to 4000 µmol m
Less than 1 ms
180°
Response below)
Less than 0.5 %
Less than 0.5 %
-0.11 ± 0.04 % per C
Less than 5 %
IP68
30.5 mm diameter, 37 mm height
140 g
-1
s
-1
s
-2 s -1 )