| 摘要 |
The invention relates to a electromagnetic method (and an apparatus) for determining the flow rate of a medium in a measuring tube (2), the medium flowing through the measuring tube (2) essentially in the direction of the measuring tube axis (10), a magnetic field permeating the measuring tube (2) essentially perpendicularly to the measuring tube axis (10), a measurement voltage being induced in at least one measuring electrode (3; 4) arranged essentially perpendicularly to the measuring tube axis (10), and the induced measurement voltage yielding information about the volumetric flow of the medium in the measuring tube (2). The invention is based on the object of proposing a method and an apparatus which make it possible automatically to identify a malfunction on a electromagnetic flowmeter (1). With regard to the method, the object is achieved by virtue of the fact that a defined test signal is passed to the measuring electrode (3; 4) and that using the response signal to the defined test signal (->actual value) and/or using a reference variable (->actual value) determined from the response signal to the defined test signal, it is ascertained whether the measuring electrode (3; 4) yields correct measured values.
|
