Technology
Load cells are electro-mechanical transducers that translate force or weight into voltage. This change in voltage produces, in the read-out instrumentation, a repeatable deflection or indication that can be calibrated directly in terms of the load applied to the cell.
Construction
Construction of the load cell utilizes all the advantages of bonded foil strain gages . Sealed within the load cell are sets of matched strain gages bonded to a high strength element, machined to close tolerances. The strain gages are electrically connected to form a balanced Wheatstone bridge and additional compensation resistors are added to the circuit for maintaining the accuracy of the bridge over a wide temperature range.
Operation
The principle of operation depends upon the deflection of the strain gage filament, creating a change in its resistance, thereby unbalancing the bridge circuit. As a result, for a given input voltage, the output voltage of the bridge varies proportionally with the load and the change can be read on appropriate instrumentation. |
