Sensor ageing determination procedure measures Wheatstone sensor bridge centre voltage average for comparison with reference value

摘要

A sensor ageing determination procedure measures the Wheatstone sensor bridge (2) centre voltage as the average of two bridge node (5, 7) voltages from an equal voltage divider (15) and compares it with a reference value (18) to create an error signal if the deviation exceeds a set value. Independent claims are included for equipment implementing the procedure.