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RT 552: pH-Value Control Trainer

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pH-Value Control Trainer

pH-Value Control Trainer pH-Value Control Trainer pH-Value Control Trainer

Product Details

Technical Description 
This teaching and training system provides a comprehensive experimental introduction to the fundamentals of process control using an example of continuous pH control.
A caustic solution is added to fresh water by way of a metering pump. The pH-value of this solution is measured. The acid is then added to the solution as a neutralising reagent by way of a second metering pump. The chemical reaction occurs in a pipeline system. The pH-value is then remeasured. A state-of-the-art digital industrial controller controls the second metering pump with reference to this pH-value. The neutralised solution flows into the product tank. A third manual measurement of the pH-value in the product tank permits disposal of solution with a neutral pH-value. The pH-value of the input solution can be varied by manually adjusting the metering pump or by varying the quantity of fresh water. This enables disturbances to be simulated. The controlled variable X and the manipulating variable Y are plotted directly on an integrated 2-channel line recorder. Alternatively, the variables can be tapped as analogue signals at lab jacks on the switch cabinet. This enables external recording equipment, such as an oscilloscope or a flatbed plotter, to be connected. 
A process control software (RT 650.50) is optionally available. The software permits the construction of a complete networked system comprising multiple trainers from the RT 512 - RT 552 series. The key process variables can also be represented, and control functions executed.
The well-structured instructional material outlines the technological fundamentals and provides a step-by-step guide through the experiments.
Learning Objectives / Experiments

- Introduction to the fundamentals of process control
- Familiarisation with real industrial process control
- Operation and parameter setting of the local
  + manually
  + using the RT 650.50 process control software
- pH-value control
  + Influence of dead time
- Ratio control
- Disturbance feedforward control
- Controller optimisation
- Properties of the open and closed control loops
- Processing of process variables using external
  equipment, e.g. oscilloscope or plotter
- In conjunction with accessory RT 650.50 and other
  trainers (RT 512 - RT 542): Familiarisation with and
  use of process control software (SCADA)
* Experimental introduction to process control using
  an example of continuous pH-value control1
* Construction of the system with components
  commonly used in industry1 
* Digital controller with freely selectable parameters:
  P, I, D and all combinations1
* Integrated 2-channel line recorder1
* Optional process control software RT 650.50
* Construction of a complete networked system via
  Profibus interface possible1


[1] Trainer for process control experiments
[2] pH-value control process, equipped with standard industrial components
[3] Neutralisation of a caustic solution with an acid
[4] 2 pH sensors in transparent measuring tanks with overflow
[5] 2 pH-value transducers with display
[6] Digital controller, configurable as a P, PI or PID controller
[7] Product tank and 2 chemicals tanks
[8] 2 metering pumps: adjustable manually or via controller, max. flow rate 2.1L/h
[9] Water connection with control valve and flowmeter
[10] Corrosion-resistant piping system
[11] Manual pH sensor for product control
[12] 2-channel line recorder
[13] Process variables X and Y accessible as analogue signals via lab jacks
[14] 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase

Technical Data
Product tank: 20L
Chemicals tank: 2x 5L
- acids and caustic solutions: in pH range 1...12
pH sensor, filled with solid electrolyte:
- with glass shaft and PTFE diaphragm
Measuring ranges:
- pH: 1...12
- temperature: 0...80°C
Line recorder:
- 2x 4...20mA
- feed rate 0...3600mm/h, stepped
Controller: external reference variable input: 4...20mA
Process variables as analogue signals: 4...20mA

Dimensions and Weight
l x w x h : 1000 x 700 x 1750 mm
Weight : approx. 85 kg

230V, 50/60Hz, 1 phase or 120V, 50/60Hz, 1 phase
Water connection

Scope of Delivery
1 pH-value control trainer, 1 manual pH value meter, 1 set of cables; 10L caustic soda NaOH 45%; 10L hydrochloric acid HCl 30%, technically pure; 1L buffer solution pH4.0 (red), 1L buffer solution pH7.0 (green), 1L buffer solution pH10.0 (blue), 1 set of instructional material

Order Details
080.55200  RT 552  pH-Value Control Trainer 

Available accessories
RT 650.12 -- PC-Interface Card Profibus DP
RT 650.50 -- Process Control Software for RT 512 - RT 552 Series
Alternative products
RT 512 -- Level Control Trainer
RT 522 -- Flow Control Trainer
RT 532 -- Pressure Control Trainer
RT 542 -- Temperature Control Trainer
RT 586 -- Analytical Process Control System
RT 512 - RT 552 Process Control Training Rigs with Process Control System

SELKA GmbH, Hamburg
Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
E-Mail:   |  Internet:

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