Vorrichtung zur gravimetrischen Pruefung von Mehrkanalpipetten

DE 29917940 U UPAB: 20000301 NOVELTY - For each channel there is a holder (9) accepting a test volume or container (2) holding it. For each holder there is a load cell (1) to weigh the container and/or the sample volume. DETAILED DESCRIPTION - Preferred Features: Each holder rests directly on its load cell, or is connected via a rod or lever system to it. Adjacent rods or levers seen from the holders, include an angle greater than zero, and/or are arranged in different planes. Spacing between adjacent load cells is the same as, or greater than, that of adjacent channels. Weighing cells include a strain gauge or operate on the principle of electromagnetic force balance. A container holder (8) moves between sample-holding and weighing positions. The holder (8) is at the end of an arm with a calibration weight receptacle, used when the holder is in the sample holding position. The holder has two jaws gripping or releasing containers. Load cells (1) and holder (8) move relatively to one another. Movements are provided pneumatically, by stepper motors and/or servomotors. Weighing cells are surrounded by a separate casing having an opening into which a rod is guided, connecting weighing cells with allocated holders (9). A sensor measures sample volume indirectly. A compressed air sensor and/or a sample fluid temperature sensor and/or an air temperature sensor are included. A computer controls operations and calculations. The containers taper towards their openings. USE - To test the accuracy of multichannel pipettes. ADVANTAGE - The accuracy of multichannel pipettes can be tested in accordance with quality assurance requirements and national standards of accuracy. The new machine mainly tests automatically, shortening the time required. Test results are automatically calculated and presented.