Mettler-toledo Ag

Mettler-toledo Gmbh

Markus Uster

Hans-Rudolf Burkhard

Andreas Metzger

Ferdinand Schneider

Stephan Baltisberger

Douglas Bliss

Cyrill Bucher

Christophe Béguin

Aaron Skidmore

George Fankhauser

Martin Heusser

The invention concerns a calibration device () for a force-measuring device (), specifically a balance, with an electrically controllable force-generating means () designed to be coupled to a force-measuring cell () of a force-measuring device () in such a way that a predefined force (F) can be applied to the force-measuring cell (), so that the latter generates a measuring signal (S) which correlates to the applied force (F) and which can be transmitted to a processing unit (, PU), where it can be processed in reference to the predefined force (F). The calibration device () includes a calibration control unit (CCU) which has access to at least one predefined parameter (P) characterizing the force-measuring device (() and/or the calibration device (), wherein the calibration control unit (CCU) can be connected by way of a communications link () to the processing unit (, PU) in order to exchange information signals (S) with the latter, and wherein the calibration control unit (CCU) is configured to generate control signals based on the information signals (S) and the parameter (P) in order to thereby control the force-generating means ().

Calibration device for a force-measuring device, and force-measuring device

A weighing cell based on the principle of electromagnetic force compensation. A permanent magnet system is mounted on a base part and includes an air gap within which is suspended a coil that is connected to a load receiver through a force-transmitting mechanism. The coil carries an electrical compensation current when the weighing cell is in operation. An optoelectronic position sensor is also included, and its signal corresponds to the deflection of the coil from a zero position which occurs as a result of placing a load on the load receiver. A closed-loop controller regulates the compensation current in response to the sensor signal in such a way that the coil and the load receiver that is connected to it are returned to their zero position by the electromagnetic force that is acting between the coil and the permanent magnet.

Weighing cell based on the principle of electromagnetic force compensation with optoelectronic position sensor

A method for adjusting a calibration arrangement of an electronic balance during the production process, wherein the calibration arrangement includes a transfer mechanism with a drive system, and wherein the calibration arrangement couples at least one calibration weight to the force-measuring device, said coupling being effected by the transfer mechanism transferring the calibration weight in a guided movement between a rest position and a calibration position. According to the method the distance between the end stops is determined by a counter system and stored into memory. Using the stored travel distance to calculate the rest position and the calibration position.

Calibration arrangement for an electronic balance

A multiple force-measuring device, especially a multiple weighing device has at least two force-measuring modules. Each force-measuring module includes a force-measuring cell and a power delivery means. The power delivery means of at least one of the force-measuring modules in this arrangement is connected, directly or through a junction element, to a control cable that is connected to a power supply unit. The force-measuring modules are connected directly to each other through a module-connection cable that transfers electrical power therebetween.

Multiple force-measuring device, force-measuring module, and method for monitoring a condition of the multiple force-measuring device

A method and associated apparatus transmits measurement values in a multi-module force-measuring device, in particular a multi-module weighing device, with at least two force-measuring modules. Each of the force-measuring modules includes a force-measuring cell and a signal-processing unit. The signal-processing unit transmits the measurement values generated by the force-measuring cell by way of a signal line to a signal-evaluating unit. Under the method, each measurement value is converted into a bit sequence by the respective signal-processing unit. The first force-measuring module's bit sequence is transmitted to the signal-evaluating unit, and the bit sequences of the signal-processing unit of the further force-measuring modules are transmitted by way of the signal-processing unit of the first force-measuring module to the signal-evaluating unit.

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Nänikon, Switzerland

Markus Uster