capacitive level transmitter / for liquids / for tanks

The Kotron? Model 804 is a unique, powerful level transmitter. The leading-edge microprocessor-based circuitry has non-volatile memory. The display and keypad simplify calibration and setup of the instrument. Powerful diagnostics check all functions of the system, simplifying troubleshooting. MagneCal? offers the user the greatest improvement in RF Capacitance?one small level change is needed to calibrate.

Operating Principle

The amount of capacitance developed in any vessel, is determined by the size (surface area) of the probe, the distance from the probe to its ground reference, and the dielectric constant of the medium being measured.

Considering that the probe?s mounting position is fixed and the dielectric of the medium is constant, then the amount of capacitance developed in any vessel becomes dependent upon the amount of the probe which is covered with media.

As the media rises and falls in the tank, the amount of capacitance developed between the probe and the ground reference also changes. The PulsatelTM circuit mounted on the probe changes the capacitance signal to a frequency proportional to the change in level. The amplifier then converts this digital signal into an isolated 4-20 mA analog output signal.

Applications

Continuous level measurement
Interface measurement
Hydrocarbons and solvents
Slurries
Acids
High temperature/pressure liquids