FI-MM Medium Fruit Growth Sensor

(15-90 mm)

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The FI-MM Sensor enables to monitor growth of medium size fruits as well as variations of their diameter in submillimeter range. Two phenomena affect diurnal behavior of fruit diameter: growth and water balance of a plant. A growth component is dominant in most of cases (see Fig.1 below). However, some fruits may loose water or decelerate their growth in result of water stress, lack of light or other negative factors(see Fig. 2 below). Two characteristics of the daily fruit growth curve are to be noted: a diurnal form and daily maximums trend that is growth rate). Thus, the FI-MM sensor allows investigating intimate effects of environmental factors on water balance and growth of fruits.



Fig 1. Typical record of a vine tomato sigmoid growth curve made with the use of FI-MM sensor.


Fig 2. Temporary depression of tomato growth (green curve) caused by  lack of light (blue curve).



The FI-M Fruit Sensor includes a LVDT-based sensor mounted on special clip and a dc powered LVDT signal conditioner with optional power adapter for unipolar power supply.




Linear Measurement Range: 15-90 mm
Output: 0-2 V or 4-20 mA (optional)
Output Temperature Coefficient: <200 ppm/?C FS
Supply Voltage: 15 Vdc 15%
Power adapter operates on 10 to 30 Vdc
Dimensions: 120 x 60 x 20 mm (sensor approx.)
120 x 70 x 37 mm (signal conditioner)
Weight of the sensor: