Sartorius Ag

Sartorius

Dieter Berthel

Franz-Josef Melcher

Christian Oldendorf

Gunther Maaz

An electronic balance with a measured value receiver, a digital signal processing unit, a display unit and a calibrating device controlled by the digital signal processing unit (18) for placing on and lifting off a calibrating weight by use of a motor that the digital signal processing unit allows the calibrating weight to be continuously placed on and lifted off again and calculates the average value and the standard deviation from the individual measured values. Then compares the calculated standard deviation continuously with a set value stored in the digital signal processing unit and stops the placing on and the lifting off of the calibrating weight and calculates the calibrating factor from the calculated average value and stores the factor as soon as the calculated standard deviation is smaller than the set value and that the digital signal processing unit also stops the placing on the lifting off of the calibrating weight after a set maximum time if the calculated standard deviation is not smaller than the set value and does not store a new calibrating factor in this instance.

Electronic balance with calibrating device

A balance with a wind guard moved by a motor whereby the position of movable walls of the guard are monitored by a sensor. An electronic memory is provided for the desired end position of the movable wall elements. The desired end position of the removable walls can be stored in this memory in a learning phase and when the walls are opened by the motor, they are opened only up to a preselected position. This minimizes the time for opening and closing the weighing area and diminishes exposure to air turbulence within the weighing area.

Balance with motor-driven wind guard

An electronic balance with a calibrating weight circuit and with a digital processing unit for the automatic drive of the calibrating weight circuit that includes a proximity sensor is built into the balance and that the automatic drive of the calibrating weight circuit by the digital signal processing unit be blocked as soon as the proximity sensor emits an output signal.

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Gottingen, Germany

Dieter Berthel