Description:
It includes a variable volume process tank, a hot water tank with electric heater and indirect heating/cooling coil, a hot water pump, two non-dedicated pumps, three on/off solenoid valves and a proportioning valve. The instrumentation includes temperature sensors, two differential water pressure sensors, a mechanical level sensor (float switch) and an electronic level sensor (conductivity). The inlets and outlets of the various pumps, valves and tanks incorporate self-sealing quick release fittings. This enables the configuration to be quickly changed, offering a wide variety of different loops.
Specification:
A multi-function process control teaching system, capable of demonstrating level, flow, pressure and temperature control loops
• Bench mounted and includes a built-in USB computer interface
• Options include: reactor vessel with conductivity measurement, pH measurement, pneumatic control valve and electronic console
• Includes the following process control demonstrations:
Process principles
- Calibration of sensors (via PC software)
- Inflow control
- Outflow control
- Direct heating
- Indirect heating
- Batch operation
- Continuous operation
- Effect of sensor lag (eg thermometer pocket)
- Effect of system time constant (eg volume change)
- Effect of dead time (eg holding tube)
- Effect of mixing/stirring (requires PCT41)
Measured variables
- Level – on/off switch (fixed hysteresis)
- Level – differential on/off switch (adjustable hysteresis)
- Level – proportional pressure sensor (slow system response)
- Flow – proportional turbine sensor
- Temperature – on/off switch (fixed hysteresis)
- Temperature – proportional thermocouple sensors
- Static pressure – proportional sensor (fast system response)
- Differential pressure – proportional pressure (fast system response)
- pH – proportional sensor(requires PCT41 and PCT42)
Controller types
- Manual control
- Effect of reverse/direct action
- On/off output with hysteresis
- Time proportioned output with adjustable P, I & D terms and cycle time
- PID proportional output with adjustable P, I & D terms
- Remote setpoint control (requires PCT41)
- Ratio, cascade and feedforward with feedback loops (requires PCT41)
Controlled variables
- On/off flow control via solenoid valves
- Time proportioned flow control via solenoid valves
- Proportional flow control via pump speed
- Proportional flow control via electrical proportioning valve
- Proportional flow control via pneumatic proportioning valve (requires PCT44)
- On/off heater power control via solid state relay
- Time proportioned heater power control via solid state relay
- Proportional heater power control via solid state relay
