Digital indicator for sensor and transmitter Sitron

A Capacitive Level Sensor measures level by applying a radio frequency (RF) signal between the capacitance electrode (the probe) and the electrically conductive vessel wall. The RF output creates a small amount of electrical current that flows through the medium (the dielectric) from the probe to the vessel wall. When the level increases or decreases the dielectric constant, or the capacitance reading, increases or decreases.

In other words, the level change results in a variation of the capacitance value around the probe, depending upon the degree of immersion. For point level detection, the probe's electronics detect the change in the RF signal and then alter the state of the level switch. For continuous level detection, the probe's electronics convert the RF signal into a 4-20mA-output signal that is proportional to the change of the level.

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