PID Controllers

The 532 Auto/Manual Station ensures the integrity of your processes with maximum reliability. Isolated inputs and outputs guard against electrical interference, the front face meets NEMA 4X standards for watertight operation, and solid metal housing and sturdy rubber keys enhance durability. The 532 has been engineered to be the industry’s most user friendly and comprehensive Auto/Manual Station. It has three digital display areas, with two offering up to 9 characters of true alphanumerics. The bright, crisp vacuum fluorescent display offers better readability than any other display technology. Additional operator friendly features include: custom programmable alarm messages, keys that illuminate when in use and an easy-to-use menu system.

The 531 provides automatic PID control backup for critical loops controlled by PLC, DCS or PC systems. Unlike a single loop controller configured to sense and retransmit a control signal, which adds liability and complexity; the 531 has a simple operator interface, special parameters for control states upon host transfer or failure, and a special pass-through circuit that provides redundancy in the control loop. In HOST mode, the control signal (4-20mA) is hard wired to pass through the 531 without degradation. In LOCAL mode, the 531 generates the CV (control) signal in AUTO or MANUAL mode. Host CV tracking enables a bumpless transfer to LOCAL mode in either LOCAL AUTO or LOCAL MANUAL mode. A special CV line sense function triggers HOST to LOCAL transfer automatically if host CV signal fails. LOCAL/HOST transfer may also be initiated by a dedicated front panel key or a contact input. The 531's setpoint may be set locally or remotely from the host, ensuring bumpless changeover to LOCAL AUTO mode. The 531 may also be operated as a manual loading station in the LOCAL MANUAL mode.