Apogee Instruments SQ-624 Owner's Manual - Page 11
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Sensor Calibration
Apogee SQ-624 Extended Range PFD Sensors have standard calibration factors of exactly:
Multiply the calibration factor by the measured mA signal to convert sensor output to photon flux density in units
of µmol m
-2
s
-1
:
Calibration Factor (250 µmol m
250
LED Output
(2000 µmol m
250 µmol m
-2
-1
s
per mA) * Sensor Output Signal (mA) = Photon Flux Density (µmol m
*
-2
-1
s
)
Sensor Output
12 mA
-2
-1
s
per mA
(12 – 4)
Example of photon flux density measurement with an
Apogee model SQ-624 Extended Range PFD Sensor. The
LED in this example Full yields a photon flux density on a
horizontal plane of 2000 µmol m
signal of 12 mA. This signal is converted to photon flux
density by subtracting the 4.0 mA offset and then
multiplying by the calibration factor of 250 mol m
mA.
=
2000
-2
-1
s
. This yields an output
-2
-1
s
)
-2
-1
s
per