Zero balance is the pressure sensor output at zero pressure.  This balance changes as temperature changes.

We can minimize the zero balance change due to temperature by inserting compensating resistors. When a temperature changes drive the transducer output higher, the changes are also driving the compensation resistor to lower output.

The zero balance offset is described as a percentage of full scale change per degree Fahrenheit (% F.S. / F). A 10,000 psi sensor with .002% F.S. / F will have a zero shift of .2 psi for every degree change from the calibration reference temperature.