Apogee Instruments SQ-618 Gebruikershandleiding - Pagina 13
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Sensor Calibration
Apogee SQ-614 ePAR 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
Full Sunlight
-2
-1
(2400 µmol m
s
)
250 µmol m
-2
-1
s
per mA) * Sensor Output Signal (mA) = Photon Flux Density (µmol m
*
(13.6 – 4)
Example of photon flux density measurement with an
Apogee model SQ-610 ePAR Sensor. Full sunlight yields a
photon flux density on a horizontal plane of approximately
2400 µmol m
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
Sensor Output
13.6 mA
-2
-1
s
per mA
=
-2
-1
s
. This yields an output signal of 13.6 mA.
-2
-1
s
)
2400
-2
-1
s
per mA.