A differential control device is a two position (on/off) switch that actuates when the measured medium reaches either of the two pre-determined extreme high or low range values, with a dead zone in between where the switch does not change states.

Differential Control

A control method that utilizes the difference between two or more variables to regulate some aspect of machine operation, often used for precise control in industrial settings.

Two Position

A term referring to devices or controls that have two distinct settings or positions, such as on/off switches or binary valves.

Measured Medium

The specific substance or entity whose properties or characteristics are being quantified or monitored.