Capacitive level sensors (phase detection)

  • Continuus Level Monitors
  • Capacitive level monitors(continuous signal output)

Main application

High accuracy measurement of a wide range of liquids

Capacitive level sensors (phase detection)

Main feature

Easy operation and adjustment

Automatic dielectric constant correction

Improved buildup prevention

High accuracy measurement

Suitable for a wide range of liquids

Sensor status easily checked on the LCD

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 gives a current output (4 to 20mA). The integrated microcomputer makes it possible to offset the output value and switching output for zero and span points.


Instruction ManualAvailable only for the registered members

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