Oscillating sensor device , particularly for a proximity sensor, for sensing a dynamic change of an attenuation caused by reducing an energy of an oscillation in a resonance circuit due to the generation of eddy currents in an object entering a sensing range of a sensing coil of the resonance circuit, comprising: - an oscillator including the resonance circuit and an amplifier fed back to the resonance circuit and configured to maintain the oscillation of the oscillator, wherein the amplifier comprises a non-linear gain characteristics defining an operating point at a preset amplitude of the oscillation of the oscillator; and - a control unit configured to control an open loop gain of the oscillator, so that the operating point is set to a preset amplitude of the oscillation, wherein the open loop gain is defined as a gain resulting from a ratio of a voltage amplitude of the oscillation at the resonance circuit and a variable amplitude of an amplifier input for an open loop condition; wherein the control unit comprises an amplitude determination unit for determining a current amplitude value of the oscillation amplitude (OA), a control deviation unit for determining an amplitude deviation (AD) between the preset amplitude (PA) and the current amplitude value; characterised in that the control unit further comprises a controlling block for implementing a control using an integration portion for readjusting the open-loop gain to provide a control signal for controlling the open loop gain of the oscillator, wherein the controlling block of the control unit is configured to provide an integration portion with a first integration factor in case of a positive amplitude deviation (AD) between a preset amplitude and a current amplitude of oscillation and with a second integration factor for a negative amplitude deviation, wherein the first integration factor and the second integration factor are different. - an oscillator including the resonance circuit and an amplifier fed back to the resonance circuit and configured to maintain the oscillation of the oscillator, wherein the amplifier comprises a non-linear gain characteristics defining an operating point at a preset amplitude of the oscillation of the oscillator; and - a control unit configured to control an open loop gain of the oscillator, so that the operating point is set to a preset amplitude of the oscillation, wherein the open loop gain is defined as a gain resulting from a ratio of a voltage amplitude of the oscillation at the resonance circuit and a variable amplitude of an amplifier input for an open loop condition; wherein the control unit comprises an amplitude determination unit for determining a current amplitude value of the oscillation amplitude (OA), a control deviation unit for determining an amplitude deviation (AD) between the preset amplitude (PA) and the current amplitude value; characterised in that the control unit further comprises a controlling block for implementing a control using an integration portion for readjusting the open-loop gain to provide a control signal for controlling the open loop gain of the oscillator, wherein the controlling block of the control unit is configured to provide an integration portion with a first integration factor in case of a positive amplitude deviation (AD) between a preset amplitude and a current amplitude of oscillation and with a second integration factor for a negative amplitude deviation, wherein the first integration factor and the second integration factor are different. <EOS>