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About Pressure Controllers
Pressure controllers are used to regulate positive or negative (vacuum) pressure. They receive pressure sensor inputs, provide control functions, and output control signals. Pressure controllers use several control types. Limit controls protect personnel and equipment by interrupting power through a load circuit when pressure exceeds or falls below a set point. Advanced controls use non-linear control strategies such as adaptive gain, dead-time compensation, and feed-forward control. Linear controls use proportional, integral and derivative (PID) control; proportional and integral (PI) control; proportional and derivative (PD) control; or proportional (P) control. PID control uses an intelligent input/output (I/O) module or program instruction for automatic closed-loop operation. PI control integrates error signaling for steady-state or offset errors. By contrast, PD control differentiates error signals to derive the rate of change. PD control increases the speed of controller response, but can be noisy and decrease system stability.
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Engineering Web: Pressure Controllers - Machine Design
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