Non-inverting op amps with sensors
Most sensors give an output which is a positive voltage or current. Most controllers using an ADC (Analog to Digital Converter) are restricted to positive voltages - typically 0 to 5 V. As a result the sensor signal can usually be interfaced directly (if the signal levels match), with a resistor divider (if the signal level is too high) or with an amplifier (if the signal voltage is too low).

Inverting a signal usually increases circuit complexity as additional components and dual-rail power-supplies are required. When a microprocessor is involved the signal can be rescaled digitally avoiding the need for external processing.