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RT 644 Temperature control demonstration unit



  • Experimental introduction to control engineering using an example of temperature control
  • Construction of the system with components commonly used in industry
  • Digital controller with freely selectable parameters: P, I, D and all combinations
  • Optional I&C software RT 650.40 via USB


Technical Description

This experimental unit provides a comprehensive experimental introduction to the fundamentals of control engineering using an example of temperature control.

All components are clearly laid out on a vertical front panel. The large-format process schematic provides an aid to understanding. The system comprises two water circuits. In the secondary circuit fresh water is heated up by a heat exchanger. The temperature is measured by a temperature sensor at the fresh water outlet. The outlet temperature of the fresh water is controlled by the flow rate of warm water in the primary circuit. The primary circuit comprises an electrically heated tank, a pump and an electromagnetic proportional valve as the actuator. Both circuits include rotameters. The controller used is a state-of-the-art digital industrial controller. A ball valve in the secondary circuit enables defined disturbance variables to be generated. The controlled variable X and the manipulating variable Y can be tapped as analogue signals at lab jacks. This enables external recording equipment, such as a plotter or an oscilloscope, to be connected.

An instrumentation and control software (RT 650.40) with interface module (USB) is available as an accessory. This enables the key process variables to be represented, and control functions executed.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- fundamentals of control engineering
- latest industrial control engineering components: controllers, transducers, actuators
- operation and parameter setting of a multi-functional state-of-the-art digital controller: e.g. parameter setting as P, PI and PID controller
- investigation of disturbance and control response
- influence of different controller parameters on stability and control quality
- investigation of the properties of the open and closed control loops
- processing of process variables using external equipment, e.g. plotter or oscilloscope
- together with accessory RT 650.40: familiarisation with and use of I&C software



[1] experimental unit for control engineering experiments
[2] temperature control with plate heat exchanger and 2 water circuits
[3] primary circuit with electrically heated tank, pump control valve, rotameter
[4] secondary circuit with fresh water connection, temperature transducer, rotameter
[5] ball valve to generate disturbance variables in fresh water circuit
[6] plate heat exchanger, 30 plates
[7] control valve: electromagnetic proportional valve
[8] digital industrial controller, freely parameterisable
[9] large process schematic on front panel
[10] process variables X and Y accessible as analogue signals via lab jacks

Technical Data

- stainless steel
- capacity: 15L
- power output: 2kW
- thermostat: 20...80°C
Pump, 3-stage
- power consumption: 90W
- max. flow rate: 83L/min
- max. head: 6m

Temperature sensor: Pt100: -50...400°C
2x dial-gauge thermometers (bimetal type): 0...80°C
2x rotameters: 30...320L/h
Electromagnetic proportional valve: Kvs: 0,8m³/h
Digital controller, can be parameterised as P, PI or PID controller
Process variables as analogue signals: 0...10V
Connection of external recording devices (e.g. oscilloscope, line recorder) via lab jacks

Dimensions and Weight
LxWxH: 1000x500x1070mm
Weight: approx. 85kg Required for Operation 230V, 50/60Hz, 1 phase
Fresh water connection approx. 100L/h

Scope of Delivery
1 experimental unit
1 set of laboratory cables
1 set of instructional material

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