The Lab-Volt Process Control Training System, Model 6090, familiarizes students with the fundamentals of instrumentation and process control. It demonstrates the control of pressure, flow, level, temperature, and pH processes. It can also demonstrate advanced process control techniques, such as feed-forward control, second-order control, and cascade control when used with a controller featuring these functions.
The basic trainer demonstrates PID (proportional, integral, derivative) control of flow, pressure, and level processes. It comes with a variable-speed pump, a tank, a column, two-way valves, pressure gauges, flexible hoses, a venturi tube, an orifice plate, a rotameter, a paddle wheel flow transmitter, and a differential pressure transmitter.
A work surface, consisting of a solid-metal perforated plate hinged to a drip tray, provides a large area (that can be laid flat or tilted to a 45?angle) on which components can be mounted. Additional work area can be added with the provided expanding work surface.
Mounting and removal of the components is made especially easy with push-lock fasteners that snap effortlessly into the perforations of the work surface. The components can be interconnected by means of flexible hoses equipped with garden-type fittings that permit easy and fast component connections without the use of tools. The hose fittings contain check valves to prevent water from running out of the hoses when they are disconnected.
Although the equipment is designed to operate atop a regular work table, an optional bench is available to provide mobility and storage space. Mounted on four heavy-duty, swivelling, lockable castors, the bench provides storage area for components. Optional dressing panels and lockable doors are also available to enclose and lock the bench.
The trainer processes can be controlled by a computer-based PID Controller implemented with a personal computer (Pentium type), the included Process Control and Simulation Software (LVPROSIM), Model 3674, and the I/O Interface, Model 9065. The trainer processes can also be controlled using any conventional PID controller compatible with standard 4-20 mA signals or 0-5 V signals.
To demonstrate PID control of temperature and pH processes, additional components can be added to the basic trainer. The additional components required for temperature process control include a heating unit, a cooling unit, and temperature transmitters. Those required for pH process control include chemical tanks, metering pumps, and a pH transmitter. Cascade and second-order process control can also be studied with the basic trainer by having the students from two workstations work together at a single workstation, or by adding the following components to the basic trainer: a Pressure Transmitter, a Column, and a PID Controller.