Abstract: A resistive sensing element circuit arrangement includes first and second variable resistance sensing elements R1 and R2 connected in series to form a resistive sensing element set having a first centre connection, first and second fixed resistors Rb1 and Rb2 connected in series and having a second centre connection, and a differential amplifier having a positive input, a negative input and an output. When the variable resistance sensing elements R1 and R2 are inactive the voltage at the first centre connection is equal to the voltage at the positive input of the differential amplifier and when the variable resistance sensing elements are active the voltage at the output of the differential amplifier is proportional to an out-of-balance current that flows through a feedback resistor Rf multiplied by the value of the feedback resistor.