Mettler-Toledo International Trading (Shanghai) Co., Ltd.

These disclosures relate to a method for detecting and removing personnel interference while measuring volume of an object. An image of an object is obtained, a background information of the image is removed, and the image is converted into a binary image. An outline of the object is detected from the binary image. A determination is made whether the outline extends towards a boundary of the field of view. If the outline of the object does not extend to the boundary of the field of view, the volume of the object is measured. Otherwise, an extending part is removed from the outline using a morphological method, if removable. If the extending part is removed, the volume of the object is measured based on an outline of the object obtained after the extended part is removed, and a class 1 warning is issued. Otherwise, a class 2 warning is issued and the measurement is ended. This approach improves efficiency of the object volume measurement.

A hydraulic system micro-adjustment device and a tank calibration system including same are disclosed. The device includes a base, a piston, valve body, valve core, and handle. The valve body includes an inner cavity for receiving the valve core from an upper portion of the valve body, the valve core being in threaded connection with the inner cavity. The piston is inserted into the inner cavity from a lower portion of the valve body and abuts the valve core. The lower portion of the valve body is mounted in the base and is in communication with oil passages therein. The handle is connected to a top of the valve core, which is movable along the inner cavity upon rotation of the handle thereby pushing the piston along the inner cavity so as to change the volume of a cavity formed by the base, the valve body, and the piston.

A digital load cell includes: a strain bridge including a Wheatstone bridge formed by connecting four resistive strain gauges and a temperature sensing resistance element connected in series to the Wheatstone bridge. An analog-to-digital conversion circuit excites the strain bridge, and includes a plurality of input channels and an output terminal. The input channels receive feedback signals from the strain bridge, and the output terminal outputs the feedback signals after analog-to-digital conversion. A signal processor includes a load force calculation unit and a state information matrix calculation unit. The load force calculation unit calculates a differential voltage and a compensation function based on the feedback signals obtained from the output terminal, and calculates a load force value based on the differential voltage and the compensation function. The digital load cell and related weighing system can provide comprehensive and effective real-time health state monitoring for the digital load cell.

A hanging scale sensor apparatus and hanging scale are disclosed. The hanging scale sensor apparatus includes an adapter beam connected to one end of a bottom face of a weighing sensor with a support base is connected to the other end of the bottom face of the weighing sensor. The adapter beam and a support base are positioned directly below the weighing sensor; and a scale pan suspension structure is connected to the adapter beam for positioning the hanging scale sensor apparatus.

Methods and systems for eccentric load error correction are disclosed. A plurality of weighing data sets for a weight having a mass value are obtained, where the weight is loaded at different positions on a weighing platform of a weighing device. Differences between each of the weighing data sets and the average value of the plurality of weighing data sets or the mass value of the weight are calculated. Sensor correction coefficients are calculated and updated when the maximum absolute value of the differences exceeds a pre-set threshold. The weighing data sets are updated. The above steps are repeated until the absolute values of all the differences are less than the pre-set threshold.

An automatic piston-gripping apparatus and a pipette including the same are disclosed. The apparatus includes a gripping mechanism, holding shank, first spring, and, optionally, piston. The gripping mechanism is arranged in the holding shank. The first spring sleeves over the gripping mechanism and is located between the gripping mechanism and holding shank. The apparatus is configured for inserting a piston from an end portion of the holding shank that faces a collet of the gripping mechanism. A locking ring is arranged at a head of the collet. The end portion of the holding shank includes a first limiting portion for positioning the locking ring. The collet extends out of the locking ring when the locking ring moves and/or moved to the first limiting portion and automatically grips the piston. The apparatus quickly and adaptively grips the piston, and an optionally produces a sound in the process thereof.

A method for configuring a calibration mechanism in a force sensor ( 100 ) has the steps of: coupling an end of the calibration lever ( 1071 ) to a loading end ( 102 ) of the force sensor; adjusting, in a no-load condition, the center of gravity (G 0 ) of the unloaded calibration lever ( 1071 ), so that the center of gravity (G 0 ) lies on a horizontal line (H) through the center of a calibration lever fulcrum ( 1031 ) at a fixed end ( 103 ) thereof; and adjusting, in a full-load condition, the center of gravity (G 1 ) of the calibration lever ( 1071 ) loaded with the calibration weight ( 106 ), so that the center of gravity (G 1 ) lies on the horizontal line (H) through the center of the calibration lever fulcrum. The calibration error caused by inclination in the force sensor is reduced by practice of this method.

A hydraulic system micro-adjustment device and a tank calibration system including same are disclosed. The device includes a base, a piston, valve body, valve core, and handle. The valve body includes an inner cavity for receiving the valve core from an upper portion of the valve body, the valve core being in threaded connection with the inner cavity. The piston is inserted into the inner cavity from a lower portion of the valve body and abuts the valve core. The lower portion of the valve body is mounted in the base and is in communication with oil passages therein. The handle is connected to a top of the valve core, which is movable along the inner cavity upon rotation of the handle thereby pushing the piston along the inner cavity so as to change the volume of a cavity formed by the base, the valve body, and the piston.

A method of weighing using a scale ( 10 ) comprises the steps of: recognizing at least one of a plurality of objects placed within an object recognition area (A) of a platform ( 20 ) of the scale ( 10 ), and weighing the plurality of objects placed on the platform ( 20 ) of the scale ( 10 ) to determine a total weight of the plurality of objects. A weighing device ( 10 ) comprises the platform ( 20 ) configured as a plane, and utilizes the aforementioned weighing method. The method of weighing is advantageous in that it reduces the difficulty of object recognition using an algorithm by increasing the degree to which the object on the weighing platform fits the algorithm, reduces the complexity of the operation flow and the time required, and effectively increases the precision and accuracy of object recognition.

A weighing method comprises the steps of: recognizing one or more objects to be detected on a first scale platform top (A) or within an object recognition area of the first scale platform top (A), and weighing the objects to be detected that are placed on a second scale platform top (B). A weighing system comprises at least two scales having scale platform tops utilizing the weighing method outlined above. The weighing method reduces the difficulty of algorithm recognition by increasing the degree to which the object on the weighting platform fits the algorithm, reduces the complexity of operation flow and the time required, and effectively increases the precision and accuracy of object recognition.