It was a valued export in Silk Road trading, but the manufacturing process was kept secret. During the Tang Dynasty (618-907) and the Song Dynasty (960-1279), varieties of paper were developed for different purposes.
April 7, 2015 Written by controlguru. Like the P-Only controller, the Proportional-Integral (PI) algorithm computes and transmits a controller output (CO) signal every sample time, T, to the final control element (e.g., valve, variable speed pump).
Process Controllers and Recorders. Process Controller and Recorder Solutions. The 353 panel mounted loop controller is a full function instrument with a complete set of control functions, including PID control, indication, logic, and sequencing. The built-in I/O can support up to three loops of PID control.