Information about Web Controllers

Web controllers are used to regulate tension, rate or alignment; or to detect breakage in a web process. They receive sensor inputs, provide control functions, and output control signals. Web controllers use several control types. Limit controls protect personnel and equipment by interrupting power through a load circuit when a monitored value exceeds or falls below a set point. Advanced controls use non-linear control strategies such as adaptive gain, dead-time compensation, fuzzy logic, neural networks, 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. P control is proportional to the error between reference and feedback signals.

Flow Controllers

Flow controllers monitor and maintain proper humidity levels in environmental test applications, or in other areas such as food storage or electronic room regulation.

Humidity Controllers

Humidity controllers monitor and maintain proper humidity levels in environmental test applications, food storage areas, and electronic equipment rooms.

Level Controllers

Level controllers monitor, regulate, and control liquid or solid levels in a process.

pH Controllers

pH and ORP controllers monitor and can control the pH (acidity or alkalinity) and/or the ORP (oxidation reduction potential) of liquids involved in a testing or process application.

Pressure Controllers

Pressure controllers accept input from pressure sensors, transmitters, gauges, and other devices and subsequently control adjustment to the pressure to maintain or achieve the desired pressure level.

Temperature Controllers

Temperature controllers accept inputs from temperature sensors or thermometers, and then output a control signal to keep the temperature at the desired level.

Universal Process Controllers

Universal process controllers constitute a broad area of control devices that may be employed in the monitoring and control of many different process variables, including temperature, pressure, flow and other values.