Control Loops

A control loop is a process management system designed to maintain a process variable at a desired set point. Each step in the loop works in conjunction with the others to manage the system. Once the set point has been established, the control loop operates using a four-step process.

Sense
Measure the current condition of the process using a sensor, which can be an electronic (Thermocouple, RTD or transmitter) or a mechanical device (thermal system).

Compare
Evaluate the measurement of the current condition against the set point using an electronic, pneumatic or electric contact controller.

Respond
React to any error that may exist by generating a corrective pneumatic or electric control signal.

Affect
Actuate a final control element (valve, heater or other device) that will produce a change in the process variable. The loop continually cycles through the steps, affecting the process variable in order to maintain the desired set point. Trerice is unique in its ability to provide all of the necessary components to create a complete control loop.

***The following is quoted from Trerice Temperature Control Catalog

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