Apogee Instruments SQ-622-SS Manuel du propriétaire - Page 11
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Sensor Calibration
Apogee SQ-622 and SQ-625 Extended Range PFD 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 (0.8 µmol m
0.8
LED Output
(2000 µmol m
SQ-622: 1.6 µmol m
SQ-625: 0.8 µmol m
-2
-1
s
per mV) * Sensor Output Signal (mV) = Photon Flux Density (µmol m
*
-2
-1
s
)
-2
-1
s
per mV
-2
-1
s
per mV
2500
=
2000
Example of photon flux density measurement with an
Apogee model Extended Range PFD sensor. The LED in this
example Full yields a photon flux density on a horizontal
-2
plane of 2000 µmol m
s
2500 mV for the 0-5 V option or an output signal of 1250
mV for the 0-2.5 V option. This signal is converted to
photon flux density by multiplying by the calibration factor.
SQ-622 Sensor Output: 1250 mV
Conversion Factor: 1.6 µmol m
SQ-625 Sensor Output: 2500 mV
Conversion Factor: 0.8 µmol m
-1
. This yields an output signal of
-2
-1
s
per mV
-2
-1
s
per mV
-2
-1
s
)