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How is level detection of a liquid in a transparent bottle achieved using capacitive proximity detectors?

Capacitive proximity sensors utilise a non-contact capacitive coupling principle to detect any object irrespective of material or conductivity, for example metals, minerals, wood , plastic, glass, cardboard, fluids etc.
Liquid level detection in a transparent  bottle is therefore possible using two capacitive sensors arranged as shown;

Sensitivity adjustment of the sensor is performed using a small screwdriver as shown;

  • Schneider Electric capacitive proximity sensors (XT1 type) are available in diameter 12mm through to diameter 32mm sizes with nominal sensing distances of 2mm through to 15mm respectively.
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