Apogee Instruments SQ-642-SS Owner's Manual - Page 11
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Sensor Calibration
Apogee SQ-642 and SQ-645 Quantum Light Pollution Sensors have standard calibration factors of exactly:
Multiply the calibration factor by the measured mV signal to convert sensor output to photon flux density in units
of µmol m
-2
s
-1
:
Calibration Factor (0.08 µmol m
0.08
LED Output
(100 µmol m
SQ-642: 0.08 µmol m
SQ-645: 0.04 µmol m
-2
-1
s
per mV) * Sensor Output Signal (mV) = Photon Flux Density (µmol m
*
-2
-1
s
)
Sensor Output
1250 mV
-2
-1
s
per mV
-2
-1
s
per mV
1250
=
Example of photon flux density measurement with an
Apogee model Quantum Light Pollution Sensor. The LED in
this example Full yields a photon flux density on a
horizontal plane of 100 µmol m
signal of 1250 mV for the 0-2.5 V option or an output signal
of 2500 mV for the 0-5 V option. This signal is converted to
photon flux density by multiplying by the calibration factor.
SQ-642 Sensor Output: 1250 mV
Conversion Factor: 0.08 µmol m
SQ-645 Sensor Output: 2500 mV
Conversion Factor: 0.04 µmol m
-2
-1
s
100
-2
-1
s
. This yields an output
-2
-1
s
per mV
-2
-1
s
per mV
)