Capacitive level sensors
CG/CGS/CG65 (phase detection)

  • Level Switches
  • Capacitive Level Instruments

Main application

Virtually any liquids, solids and bulk solids

Capacitive level sensors

Main feature

Easy programming by push buttons

Multifunctional with microcomputer

First level switch to have status indicating LCD

Improved buildup prevention performance

Extremely reliable

Principle of Operation

The basic oscillator circuit is of the parallel resonance circuit with L (coil) and C (capacitance between the electrodes).
The oscillation frequency (f) of this circuit is : f = 1/2 π √LC.
The frequency without material around the sensor (f1) is: f1 = 1/2 π √LC, where C is the capacitance without material around the sensor (zero point).
With material around the sensor, the capacitance increases (C+ΔC), and the frequency (f2) is: f2 = 1/2 π √L(C+ΔC), where C+ΔC is the capacitance with material around the sensor (span point).
The sensor detects the frequency change from f1 to f2, and actuates the relay. The frequency range is divided into 8 segments (between zero and span), and the set and reset points assigned on a desired segment, which means high limit, low limit and hysteresis can be programmed.

Set range is divided into 8 segments, and ON/OFF points are set for the segments. Hysteresis is also programmable.


Instruction ManualAvailable only for the registered members

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