PCU Full Form
Objectives of process control operation
- Ensure stable process operation- 1. Particularly, keep the plant operating under safe conditions 2. Minimize damage to equipment due to variation in plant conditions
- Ensure operation meets product specification-1. Minimize impact of external disturbances- Example: Change in ambient temperature
- Optimize Process performance- 1. Minimize Process throughput 2. Minimize operating costs.
The final control element is usually a control valve
Exceptions: electric heaters, mixers and variable speed drives
The actuator is either a motor or a bellows that opens or closes the valves response to the signal.