How did adding a second probe to the control system correct the downfall of the single probe?

Adding a second probe to the control system serves to establish a differential between the cut-off and cut-on levels, which significantly enhances the performance and reliability of the system. In a single probe setup, the control system can face limitations, such as oscillation or instability, due to the lack of a clear distinction between when a device should turn on and when it should turn off. By integrating a second probe, the control system can accurately detect both the lower and upper thresholds of operation, effectively creating a delay in action that prevents the system from toggling rapidly between states. This differential is crucial because it allows for better temperature regulation, minimizes wear on the components, and increases the overall efficiency of the system. By delineating the operational range, the second probe helps maintain stable conditions which are essential in commercial food equipment applications.