Apogee Instruments SQ-610 Owner's Manual - Page 13
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Sensor Calibration
Apogee SQ-612 and SQ-615 ePAR 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
Full Sunlight
-2
-1
(2400 µmol m
s
)
SQ-612: 1.6 µmol m
SQ-615: 0.8 µmol m
-2
-1
s
per mV) * Sensor Output Signal (mV) = Photon Flux Density (µmol m
*
3000
Example of photon flux density measurement with an
Apogee model ePAR sensor. Full sunlight yields a photon
flux density on a horizontal plane of approximately 2400
µmol m
0-5 V option or an output signal of 1500 mV for the 0-2.5 V
option. This signal is converted to photon flux density by
multiplying by the calibration factor.
SQ-612 Sensor Output: 1500 mV
SQ-615 Sensor Output: 3000 mV
-2
-1
s
per mV
-2
-1
s
per mV
=
2400
-2
-1
s
. This yields an output signal of 3000 mV for the
Conversion Factor: 1.6 µmol m
Conversion Factor: 0.8 µmol m
-2
-1
s
)
-2
-1
s
per mV
-2
-1
s
per mV