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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

-1

Calibration Factor (250 µmol m

250

Full Sunlight

-2

-1

(2400 µmol m

)

250 µmol m

-2

-1

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

per mA

-2

-1

. This yields an output signal of 13.6 mA.

-2

-1

)

2400

-2

-1

per mA.