Electromagnetic Flow Meter
AssigneeABB AB
InventorPeter Asquith
Life of this patent
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Abstract
A method of determining the inter-electrode or electrode-to-ground impedance or the filling state of an electromagnetic flow meter having flow sensing electrodes connected to an electrode signal amplifier, the method comprising applying a test input signal to the flow sensing electrodes via a connection through which an output flow measurement signal of the flow meter is transmitted from the amplifier, in a manner such that the output of the amplifier is indicative of the said impedance or the filling state.
Claims24
A method of determining the electrode impedance (as herein before defined) or the filling state of an electromagnetic flow meter having flow sensing electrodes connected to an electrode signal amplifier, the method comprising applying a test input signal to a said electrode via a connection through which an output flow measurement signal of the flow meter is transmitted from the amplifier, in a manner such that the output of the amplifier is indicative of the electrode impedance or the filling state.
A method of measuring the electrode impedance (as herein before defined) or the filling state of an electromagnetic flow meter having flow sensing electrodes connected to an electrode signal amplifier, the method comprising applying a test input signal to a said electrode via a connection through which an output flow measurement signal is transmitted from the amplifier, and via a path bypassing the amplifier.
An electromagnetic flow meter comprising sensing electrodes, an electrode signal amplifier, the electrodes being connected to the electrode signal amplifier, and a test circuit for applying a test input signal to a said electrode via a connection through which an output flow measurement signal is transmitted from the amplifier.
Dependencies are inferred from the claim text.