Patent ID: 6792371
Filing Date: 2004-09-14
Classification: G01G,G01L

Abstract:
A system for calibrating a plurality of weighing installations of the kind having a working configuration of a plurality of working load cells each with a fixed side and a load-bearing side, supports for the fixed sides of the load cells, and a load operatively mounted on and distributed between the load-bearing sides of the load cells, comprising portable apparatus moveable between installations to be calibrated, and fixed apparatus at each installation to be calibrated, wherein, the fixed apparatus at each installation includes a plurality of anchorage means fast with each working load cell support, the portable apparatus includes as many reference load cells and fluid rams as are necessary to apply calibrating loads simultaneously to each of the plurality of working load cells in the working configuration of any of said installations, a source of fluid under pressure, and means for supplying fluid under pressure from the source simultaneously to the fluid rams associated with each one of the plurality of reference load cells,and the reference cells and the rams are removably connectable between the anchorage means and the load-bearing sides of the working load cells to apply calibrating loads to the working load cells in the working configurations of the installations, wherein the system is operable to calibrate each load cell selectively as well as simultaneously and, the portable apparatus includes switch means for diverting fluid to the ram or rams associated with each of the plurality of reference load cells in turn, and for selecting the outputs of the corresponding load cells for recording.