KROHNE Messtechnik GmbH

A method for operating an ultrasonic flowmeter is provided. The ultrasonic flowmeter has at least a first ultrasonic transducer pair and a second ultrasonic transducer pair. The first ultrasonic transducer pair is arranged on a measuring tube such that a first measuring path with a length L1 is spanned between the ultrasonic transducers of the first ultrasonic transducer pair. The second ultrasonic transducer pair is arranged on the measuring tube in such a way that a second measuring path with a length L2 is spanned between the ultrasonic transducers of the second ultrasonic transducer pair. The ultrasonic flowmeter has a control and evaluation unit for controlling the ultrasonic transducers and for evaluating the measuring signals captured by the ultrasonic transducers.

An ultrasonic flowmeter comprising a measuring tube, a first ultrasonic transducer, a second ultrasonic transducer, and a control and evaluation unit. The first ultrasonic transducer and the second ultrasonic transducer are arranged axially offset on the measuring tube. The first ultrasonic transducer is an ultrasonic actuator. The second ultrasonic transducer is an ultrasonic sensor. The control and evaluation unit controls the ultrasonic actuator in the operating state of the ultrasonic flowmeter such that a guided ultrasonic wave is excited in the measuring tube through which a fluid flows. The guided ultrasonic wave propagates in a combined waveguide in an axial direction the measuring tube and the fluid. The ultrasonic sensor receives the guided ultrasonic wave and the control and evaluation unit determines a flow velocity of the fluid by evaluating the received guided ultrasonic wave.

Monitoring the status of a distance sensor operating by determining the transit time of electromagnetic waves includes: during operation, detecting an operating temperature of the distance sensor and determining an operating frequency spectrum of a ringing signal generated and detected at the operating temperature, wherein a reference frequency spectrum of a ringing signal generated and detected at a reference temperature in a good state of the distance sensor is stored in the distance sensor; determining an expected reference frequency spectrum from the operating temperature and the operating frequency spectrum determined at the operating temperature; comparing the reference frequency spectrum stored in the distance sensor with the expected reference frequency spectrum in a comparison step; determining a reference frequency spectrum deviation based on the comparing; determining a state deviation of the distance sensor from the reference frequency spectrum deviation; and signaling, at least indirectly, the state deviation.

A method for operating a filling system includes: determining a current valve curve of a first filling valve and a current valve curve of a second filling valve; comparing the current valve curve of the first filling valve with a reference valve curve of the first filling valve and comparing the current valve curve of the second filling valve with a reference valve curve of the second filling valve; adjusting a number of filling points at which the current valve curve differs from the associated reference valve curve; detecting and signaling a filling point error in the event of a deviation of the valve curve from the reference valve curve at one filling point; and detecting and signaling a process error in the case of deviation of the valve curve from the reference valve curve at both filling points.

A method for changing an existing access key in a field device in automation technology includes the steps of: providing a key database on a database server; generating a key data set for a user authorized to access or a control unit authorized to access from the key database; and transferring the key data set to the control unit of the access-authorized user or the access-authorized control unit, so that the control unit of the access-authorized user or the access-authorized control unit has the existing access keys of the field devices for which an access authorization exists. The key database is for a plurality of field devices and contains at least a field device identifier of a respective field device, the existing access key of the respective field device and the identifier of a user authorized to access and/or a control unit authorized to access the respective field device.

A magnetic-inductive flowmeter and a method for operating the flowmeter are disclosed. The flowmeter has a measuring tube, a magnetic field generator, and a controller with first and second measuring terminals. A medium is made to flow through the measuring tube. The controller performs the following steps: generating and feeding an emission signal and receiving a receive signal caused by the emission signal at the first measuring terminal and second measuring terminal; determining an impedance with an impedance amount and an impedance phase using the emission signal and the receive signal; and signaling a short circuit if the impedance amount is smaller than a first limit impedance amount and the impedance phase is larger than a limit impedance phase.

A method for calibrating a filling system is disclosed. In a first calibration step, a calibration of a calibration variable of a first flow or level measuring device is performed at a first calibration point. In a first deviation determination step, the first control and evaluation unit of the measuring device determines an average deviation of the calibration variable from a desired value. In a first correction step, the first control and evaluation unit corrects a calibration parameter taking into account the determined deviation. In a first transmission step, the first control and evaluation unit transmits the determined deviation and/or the corrected calibration parameter to the second control and evaluation unit. In a first adaptation step, the second control and evaluation unit corrects a calibration parameter at a first calibration point, taking into account the deviation transmitted by the first control and evaluation unit or the transmitted calibration parameter.

A method for operating a filling system for filling a target volume of a first medium is described and shown. The filling system has at least one filling point measuring device, at least one control measuring device and at least one computing unit. The filling point measuring device controls the filling of the target volume, wherein the control measuring device is arranged in the filling system such that it captures the target volume of the medium to be filled which is controlled by the filling point measuring device, and wherein the filling point measuring device and the control measuring device are connected to the computing unit.

A system includes a fill level measuring device and at least one attachment. The fill level measuring device measures the fill level of a medium in a container. The fill level measuring device has a control and evaluation unit for generating a measurement signal, and a process connection element. The process connection element has a transmission element on the medium side. The transmission element is at least partially permeable to the measurement signal. The at least one attachment is connected to the process connection element. The at least one attachment has, on the medium side, an attachment lens for coupling the measurement signal into the container. The attachment lens is designed and, during operation, arranged behind the transmission element in the propagation direction of the measurement signal in such a way that the attachment lens changes the opening angle of the measurement signal.

An ultrasonic flowmeter includes at least a first, a second, and a third ultrasonic transducer, and a control and evaluation unit for controlling the ultrasonic transducers and for evaluating measured signals. The flowmeter is configured such that, during operation, the first and second ultrasonic transducers are arranged on a measuring tube offset relative to one another such that a measuring path is present therebetween. The measuring path is defined by the course of the ultrasonic measuring signal during operation. The third ultrasonic transducer is arranged on the measuring tube during operation such that an additional reference path is defined, which includes the course of the Lamb wave emitted by at least one ultrasonic transmitter into the measuring tube wall. The control and evaluation unit determines the velocity of a medium flowing through the measuring tube taking into account the propagation velocity of the Lamb wave in the measuring tube wall.