FILL LEVEL MONITORING

摘要

Fill level monitoring relates to a method for controlling the fill level of a collecting vessel, wherein the collecting vessel could be filled with a dielectric medium. A fill level is monitored by a monitoring circuit with a measuring capacitor, the capacity of which changes steadily in correlation with the fill level, at least beyond a fill level range of the collecting vessel. The method includes: determining a capacity of the measuring capacitor; determining the quality of the measuring capacitor; determining a permissivity of the dielectric medium on the basis of the quality of the measuring capacitor; determining a fill level of the collecting vessel on the basis of the determined capacity of the measuring capacitor and the permissivity of the dielectric medium; and fill level-dependent drainage of the dielectric medium from the collecting vessel.

主权项

1. A method for the fill level control of a collecting vessel which is capable of being filled with a dielectric medium, wherein a fill level is monitored by means of a monitoring circuit with a measuring capacitor, the capacitance whereof steadily changes in correlation with the fill level at least over a fill level range of the collecting vessel, the method including the following steps:
ascertaining a capacitance of the measuring capacitor, ascertaining the quality of the measuring capacitor, determining a permissivity of the dielectric medium on the basis of the quality of the measuring capacitor, determining a fill level of the collecting vessel on the basis of the ascertained capacitance of the measuring capacitor and the permissivity of the dielectric medium,wherein
fill level-dependent drainage of the dielectric medium from the collecting vessel,and the quality of the measuring capacitor is ascertained by determining the difference between output voltages of the monitoring circuit before and after a change in an operating point or a circuit quality of the monitoring circuit.