• Touch screen controller with part temperature control
• Adds the ability to control the part temperature instead of only the air temperature
• Ordered in place of standard F4T-T touch screen controller
• Available for TestEquity temperature chambers
• Not for use with temperature/humidity chambers

The TestEquity TE-F4T-T-CASCADE is a touch screen controller with part temperature control – it adds the ability to control the part temperature instead of only the air temperature. This is ordered in place of standard F4T-T touch screen controller.

Cascade Control is the technical name for a multi-loop control system where the air temperature set point (Inner Loop) is determined by deviation of the part temperature (Outer Loop) from its set point.

The controller is configured at the factory to allow the Air Temperature to deviate no more than +15°C or –15°C from the Part Temperature set point. This means if the set point is 85°C, the Air Temperature could go as high as 100°C if the Part Temperature lagged sufficiently during a heat up condition. In the example shown here, the Air Temperature went as high as 90.7°C when the Product Temperature achieved 83.0°C. Conversely, the Air Temperature went as low as 18.6°C when the Product Temperature achieved 23.4°C in order to reach a 23.0°C set point. In both instances, The Air Temperature then began to approach the Part Temperature as the part began to stabilize, until the two temperatures were ultimately nearly identical.

The graph shown here represents Air Temperature vs. Part Temperature when Cascade Control is used. The Air Temperature is allowed to overshoot or under shoot in a controlled manner as required to achieve the desired Part Temperature while minimizing lag time.

Please note - Cascade Control and Cascade Refrigeration are two completely unrelated terms. Cascade Refrigeration systems uses two interdependent compressors to achieve very low temperatures. Cascade Control is available for both Single-Stage and Cascade Refrigeration systems.