The invention provides a method of driving a vibrating sensor in which the drive signal is combined with an amplitude modulated high frequency carrier. The signal is demodulated at a position adjacent to the component to be driven. This method may be applied to reducing cross-talk between drive and pick-up wire pairs and also to passing both drive and pickup signals, and two drive signals, down the same wire pair.

An assembly arrangement for connecting a membrane of a vibration sensor with a drive unit such that vibrations of the drive unit are transmitted to the membrane and vibrations of the membrane are transferred to the drive unit, wherein the assembly arrangement is formed as a cylindrical sleeve, having on one end a fastening section for indirectly or directly fastening to the membrane or an element connected with the membrane, and an insertion opening for the drive unit on the other end.

An add-on module for a sensor, such as a fill and/or limit level sensor, comprising a coupling unit, which is arranged to be communicatively couplable to at least one predetermined sensor, and a control unit, which is configured to enable and/or disable data processing of the at least one predetermined sensor. Furthermore, the invention also relates to a sensor unit for detecting a fill level and/or limit level, comprising at least one sensor, and such an additional module, as well as a method for controlling such a sensor unit.

In one aspect, a mud-gas separator vessel defines an internal region in which a slurry is adapted to be collected. The slurry defines a fluid level. A sensor is adapted to measure the fluid level. An electronic controller is in communication with the sensor and is adapted to receive measurement data. A control valve is in communication with the controller and is adapted to control discharge of the slurry. The controller is adapted to automatically control the control valve based on the measurement data and thus actively control the fluid level using the control valve. In another aspect, a method is provided for automatically maintaining the fluid level to prevent vent gas carry under from the separator vessel. In another aspect, a kit is provided for actively controlling the fluid level. In another aspect, a method of retrofitting a mud-gas separator apparatus is provided.

A method for determining and/or monitoring a process variable of a medium using a vibronic sensor includes: exciting a mechanically vibratable unit to vibrate in a first vibration mode via a drive/receiving unit using a first excitation signal; receiving and converting the vibrations of the first vibration mode into a first reception signal; generating the first excitation signal based on the first reception signal; determining the process variable from the first reception signal; exciting the vibratable unit to vibrate in a second vibration mode via the drive/receiving unit via a second excitation signal; receiving and converting the vibrations the second vibration mode into a second reception signal, where the second excitation signal is generated based on the second reception signal; and compensating for an influence of a temperature of the medium on the first reception signal using the second reception signal.

Apparatus features a container and a transducer. The container is made of a selected material and has a container wall with a selected thickness, and configured to hold a fluid therein. The transducer is configured on the outside of the container wall, and is also configured to provide a standing wave into the fluid. The selected thickness and material of the container wall is chosen to ensure about a ½ wavelength of a desired frequency exists within the container wall, so as to substantially reduce back reflections toward the transducer due to any mismatch in acoustic impedance at the interface between the container wall and the fluid, and so as to substantially maximize the amount of energy delivered to the fluid, thus improving the operating efficiency of the apparatus.

A vibronic sensor for determining and/or monitoring at least one process variable of a medium in a container. The sensor at least comprising: a unit which can oscillate mechanically; a driving/receiving unit; and an electronic unit. The driving/receiving unit is designed to excite, by means of an electrical excitation signal, mechanical oscillations in the unit which can oscillate mechanically and is designed to receive the mechanical oscillations of the unit which can oscillate mechanically, and to convert them into an electrical receiving signal. The electronic unit is designed to generate the excitation signal on the basis of the receiving signal and to determine the at least one process variable from the receiving signal; The electronic unit comprises at least one adaptive filter; and the electronic unit is designed to set the filter characteristic of the adaptive filter in such a way that there is a target phase shift between the excitation signal and the receiving signal.

A method and beverage container assembly for determining a level of liquid in a beverage container having a lid removably attached thereto. The beverage container assembly including a sensor configured to measure sound waves in the beverage container assembly. A processor is electronically coupled to the sensor, and to memory provided with executable instructions for causing the processor to determine the level of liquid. The executable instructions, when executed by the processor, cause the processor to receive a sound wave measurement from the sensor, obtain a frequency characteristic of the sound wave measurement, and obtain reference information regarding a set of characteristics of the beverage container assembly. The processor may determine the level of liquid in the beverage container assembly based on the frequency characteristic and the reference information.

A fill-level measuring device having an oscillatory system, which has at least one external, tubular, oscillatory element and an inner oscillatory element. The outer oscillatory element at least sectionally coaxially surrounds the inner oscillatory element. In an inner space of the inner oscillatory element, a compensation apparatus shiftable in the axial direction and having at least a first locking element, a second locking element and a coupling element is arranged. The locking elements and the coupling element are composed of piezoelectric material, wherein the coupling element, the first locking element and the second locking element are connected with one another, and wherein the first locking element and the second locking element in a resting state are each connected by force interlocking, e.g. friction interlocking, with a wall of the inner space, and the fill-level measuring device has an electronics unit, which is embodied to position the compensation apparatus at a predeterminable position by means of electrical signals.

An electrical device (10, 13), in particular a power transformer (13), a shunt reactor, or an on-load tap changer (10), comprises a housing (101, 131) that is filled or fillable with insulation oil (11, 11′); and a sensor (12) that comprises a piezo element (16) in the housing (101, 131) on a level with a minimum fill level (19, 19′) of the insulation oil (11, 11′); and an evaluation device (18) that is connected to the piezo element (16); wherein the evaluation device (18) is formed such that it can induce an oscillation of the piezo element (16);
and it can determine the fill level from a measurement of a characteristic of the oscillation, in particular the half-life period of the amplitude of the oscillation.