- The Work Load: This is the material to be heated.
- The Heat Source: Either electrical resistance or fuel fired heat.
- The Heat Transfer Medium: The solid, liquid, or gas that transfers the heat energy to the load.
- The Controlling Device: The sensing and controlling devices that control the amount of heating and maintain a specific temperature for the load.
Sensor placement can limit the effects of thermal lags in the heat transfer process. The controller can only respond to the temperature changes it “sees” through feedback from the sensor location. Thus, sensor placement “in the sweet spot” will influence the ability of the controller to regulate temperature about a desired set point.
Sensor In a Static System
Sensor In a Dynamic System
We recommend that the electronic controller selected for this situation include the PID features (anticipation and offset ability) to compensate for these conditions. With the sensor at or near the workload, it can quickly sense temperature rises and falls.