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Load Cell Terms

Axial Load – The load applied to the length of, or parallel to, the primary axis with which it shares a common axis.
 
Calibration – Load cell output comparison against standard test loads.
 
Creep – The output change of a load cell that occurs over time while it is under load, while all environmental conditions and other variables have remained constant.
 
Dead Volume – The volume inside the pressure port of a sensor, or transducer, at room temperature and barometric pressure.
 
Deflection – The change of length along the primary axis of the load cell involving no-load and rated-load conditions.
 
Diaphragm – The membrane part of a sensor that changes its value under pressure-induced displacement.
 
Drift – An unexpected change in output under constant load conditions.
 
Driveline Shaft – A steel tube with a u-joint at each end that transfers torque from the output of the transfer case to the axle.
 
Eccentric Load – A load, which is applied parallel to, but not having a common axis with, the primary axis.
 
Electrical Excitation –The current or voltage that is applied to the input terminals of a transducer.
 
Flush Diaphragm – A sensing device that is located on the very end of a transducer with no pressure port.
 
Full Scale – The amount produced equivalent to the maximum load for a specific application or test.
 
Full Scale Output – The numerical distinction between the least output and the rated capacity.
 
Hysteresis – The greatest difference between load cell output readings for the same applied load. One reading is obtained by escalating the load from zero, the other by lessening the load from rated output.
 
Input Impedance – The resistance measured across the excitation terminals of a transducer at room temperature at the point where there is no load applied and the output terminals are open-circuited.
 
Load – The force, weight or torque that is applied to the transducer, cell or sensor.
 
Load Cell – The round shape of the top surface of a load cell, transducer or load sensor where the load is applied.
 
Measured Media – The physical number, property or circumstance that is measured, such as acceleration, force, mass or torque.
 
Piezoresistance – The change in resistance caused by an applied strain of the diaphragm.
 
Primary Axis – The geometric centerline (axis) along which the load cell is designed to be loaded.
 
Pull Plate – An attachment to the load cell, which allows tension or compression force to be directed at the center line of a load cell through a threaded center hole.
 
Safe Overage – The maximum pressure or load that may be applied to the transducer, load cell or sensor without causing permanent damage or a change in the performance specifications.
 
Shear – Force that tends to divide an object along a plane parallel to the opposing stresses.
 
Strain Measurement – The ratio of the change of the length of a structure when force is applied to it to the dimension of the original length.
 
Zero Balance – The output signal rated excitation of a load cell with no load applied, usually expressed in percent of rated output.