Armfield

The NA8 Ships Stability System is designed for the study of ship hydrostatics and stability. A comprehensive manual provides hydrostatic stability and other data for ship models and includes a number of experiments which are useful to students. Exercises are conducted on a 1/70 scale model of a general cargo vessel of 28,000-tonne ship mass. Rolling, righting and the effects of flooding various compartments may be studied. Optional alternative ships models are also available for study.

Industrial Process Controllers. Each practical work study system consists of a bench top process demonstration unit and a control console, that contains the power supplies and interfacing for all measurement and actuation signals. Specific industrial controllers are available as accessories to further develop the practical instruction courses possible.

The Essentials of Process Control (EPC) range of products takes students through the fundamentals of principles of process control, and progresses to give them a thorough grounding in the control of physical processes. Four independent process units demonstrate level, flow, temperature and pressure as the controlled variable. The concepts of closed loop control, including on/off control, proportional control, proportional/integral and proportional/integral/derivative (PID) control can be explored and demonstrated. Some units also cover both time proportioning and analogue control of the same parameter. To demonstrate industrial control systems, two further controlling devices are available, a full function industrial PID controller with autotune, and a programmable logic controller (PLC).

This provides a cost-effective way of teaching a wide range of process control techniques, including temperature measurement and flow control. More sophisticated aspects of process control can be addressed by adding optional extras to the basic system. The PCT40 is computer controlled with optional manual control available using the PCT43 Electronic Control Console.