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07/11/2011
Union opens sales and service subsidiary in Dubai
November 1st Union has opened a sales office in Dubai, in order to be closer to our key markets.
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17/05/2011
Article in May issue of Cryogen
Read about CO2 capture from Hydrogen Production with the patented FlashCO2 technology
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21/03/2011
Read the article from Gasworld Magazine
All about increasing customer focus and continuing to develop new and better CO2 technologies.
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16/11/2010
Serious Service launched at BRAU in Nuremberg
At the BRAU BEVIALE Union Engineering launced a broad service programme under the name Serious Service
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Control Systems


Control Systems

When buying a Union Engineering CO2 plant, we can supply different kinds of control solutions and installations, depending on the plant type.

CO2 plants <1000 kg/h

In order to achieve the most reliable control solutions in CO2 plants less than 1000 kg/h, the installations are to a great extent based on standardisation. Electrical process controls supplied by Union Engineering are thoroughly tested, minimising on-site test and commissioning time.

CO2 plants >1000 kg/h

CO2 plants with a capacity of larger than 1000 kg/h are often built according to pre-defined operating conditions and customer requirements. In this case Union Engineering can offer great experience in designing the control philosophy according to the desired specifications.

These CO2 plants are always divided into several skids and the installation for instruments can be made in different ways depending on the plant design. The instrumentation can be pre-wired to junction boxes or to remote I/O panels. A combination of the two is also used.

Another option is to use Profibus or Fieldbus instrumentation for analogue instrumentation.

Hardware configurations

All Union Engineering plants are PLC controlled via an operator interface system.

PLC hardware

In general all plants supplied by Union Engineering are PLC controlled. This gives easy access to change operational parameters if required.

Union Engineering supplies Allen Bradley and Siemens PLC’s as standard, ensuring reliable control solutions. Other manufactures can be supplied upon request.

Our standard PLC's are:

  • Siemens type S 7/300
  • Siemens type S 7/400

The above mentioned PLC's can be combined with hardware for remote I/O, Profibus or Fieldbus systems.

Operator interfaces

To make operation of the plants easy and logical, all plant control is done from an operator interface system.


The normal functions such as start and stop push buttons as well as running and fault lamps are replaced by symbols on the screen. In addition it is possible to see in clear text if an alarm or trip is activated. Actual temperatures, pressures, flows etc. can be shown if the plant is equipped with transmitters. Alarm logging and password protection is possible.

Our standard operator panels are:

  • Allen Bradley type: Panelview plus 1000 Color (key pad)
  • Siemens type: MP370 12" (key pad)

Scada systems

If a more advanced operator interface system is required, a PC based system, Fix DMAC, is an option. Using a PC based operator interface system opens up a lot of possibilities such as graphic plant lay-out in colour with mouse operated functions, trend curves for pre-chosen parameters, change of alarm, trip set points, operation set points, timers, PID regulators etc. directly from the plant screen by activating icons on the screen.

LCD screen delivered from Union Engineering
PC based operator interface system
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