Mechanically the sensor for the SA, SP, Sl & SG Series is a simple lever & fulcrum.  One end of the lever holds the weighing pan where an unknown weight is placed.  On the opposite end of the lever is a FORCE COIL suspended in a magnetic field (much in the same way a speaker operates).  The displacement detector, and power amplifier produce an appropriate current to hold the lever balanced in the null position for any weight placed on the pan.  The amount of current required to do this is proportional to the weight on the pan.

The MICROPROCESSOR monitors the current produced in response to the applied load to determine the magnitude of the weight.  Software contained in memory allows the user through the front panel, keyboard or one of the optional interfaces to perform such tasks as converting units of weight and parts counting.  In addition the user can change filter parameters to suit most environments or gather statistical data form groups of weights.  Calibration coefficients and user developed constants are stored in a non volatile memory.