This trainer provides a comprehensiveexperimental introduction to the fundamentals of control engineering using anexample of pressure control. The air pressure control system is a 2nd ordersystem. It comprises two in-line pressure tanks interconnected by a flowcontrol valve. An additional valve on the second tank makes air tappingpossible and so can be used to simulate a disturbance variable. A pressuresensor measures the pressure in the second vessel. The controller used is astate-of-the-art digital industrial controller. The actuator in the loop is apneumatically operated control valve with a standardised current signal input.The controlled variable X and the manipulating variable Y are plotted directlyon an integrated 2-channel line recorder. Alternatively, the variables can betapped as analogue signals at lab jacks on the switch cabinet. This enablesexternal recording equipment, such as an oscilloscope or a flatbed plotter, tobe connected.