Capacitive level sensor for liquids
NC56
Fischer Mess- und Regeltechnik
Principles of Operation
Two parallel metal rods with a fixed distance between them form a capacitor when charged with an A.C. voltage.
When these rods are immersed in a liquid medium, the capacitance value is a function of the immersed length. With the probes fixed vertically downward, the immersed length is proportional to the liquid level. Capacitance of probes is therefore a function of level. An electronic circuit module within instrument converts the capacitance value to a level measurement and transmits as a linear standard electrical signal: 0-20 mA, 4-20 mA,0-10 V DC, 0-5 V DC, 1-5 V DC or 2-10 V DC.
-
zoom
