1. A sensor varies from 1 to 15 kΩ. Use this in an op amp circuit to provide a voltage varying from 0 to 5 V as the resistance changes.
2. A process signal varies from 4 to 20 mA. The setpoint is 9.5 mA. Use a current-tovoltage converter and a summing amplifier to get a voltage error signal with a scale factor of 0.5 V/mA.