Comparison Chart

Specicaons
Output Opons
All other
models
SQ-500
& SQ-520
FULL-SPECTRUM QUANTUM SENSORS |
SQ-500 Series
Power Supply Self-powered 3.3 to 24 V DC 12 to 24 V DC 5.5 to 24 V DC
Uses a 5 V USB
power source and
has a 2.1 mA current
draw when logging
5.5 to 24 V DC 5.5 to 24 V DC
Current Draw ― At 12 V is 57 μA maximum of 20 mA At 12 V is 57 μA ―
1.4 mA
(quiescent),
1.8 mA (acve)
20 mA
maximum
Output (sensivity)
0.01 mV per
μmol m⁻² s⁻¹
0.625 mV per
μmol m⁻² s⁻¹
0.004 mA per
μmol m⁻² s⁻¹
1.25 mV per
μmol m⁻² s⁻¹
― ― ―
Resoluon ― ― ― ― 0.1 μmol m⁻² s⁻¹ ― ―
Calibraon Factor
(reciprocal of output)
100 μmol m⁻² s⁻¹
per mV
1.6 μmol m⁻² s⁻¹
per mV
250 μmol m⁻² s⁻¹
per mA
0.8 μmol m⁻² s⁻¹
per mV
Custom for each sensor
and stored in the rmware
Calibraon
Uncertainty
± 5 %
Output Range 0 to 40 mV 0 to 2.5 V 4 to 20 mA 0 to 5 V USB SDI-12 Modbus
Measurement
Repeatability
Less than 0.5 % Less than 1 % Less than 0.5 % Less than 1 % Less than 0.5 % Less than 1 %
Long-term Dri Less than 2 % per year
Non-linearity Less than 1 % (up to 4000 μmol m⁻² s⁻¹)
Response Time Less than 1 ms
Soware updates
every second
Less than 0.6 s 320 ms
Field of View 180°
Spectral Range 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %)
Spectral Selecvity Less than 10 % from 412 to 682 nm ± 5 nm
Direconal (Cosine)
Response
± 2 % at 45°, ± 5 % at 75° zenith angle
Temperature
Response
-0.11 ± 0.04 % per C
Operang
Environment
-40 to 70 C; 0 to 100 % relave humidity; can be submerged in water up to depths of 30 m
Dimensions
24 mm diameter,
37 mm height
30.5 mm diameter, 36.6 mm height
24 mm diameter,
37 mm height
30.5 mm diameter,
36.6 mm height
Mass
100 g
(5 m of lead wire)
51 g
100 g
(5 m of lead wire)
51 g
SQ-500-SS
SQ-522-SS
SQ-521-SS
SQ-512-SS
SQ-515-SS SQ-520SQ-514-SS
• 0 to 40 mV • 0 to 2.5 V
• 0 to 5 V • 4 to 20 mA
• USB • SDI-12
• Modbus • or hand-held meter
MQ-500
Provides research-grade
measurements under all light
sources, including LEDs