Don’t let ATEX restrict your plans

The task of designing process control systems that meet DSEAR, ATEX and other similar standards requires considerable levels of expertise and competence in order to deliver a suitably compliant process that meets the demands of the application. The primary concern in such conditions is safety and often this may need to be maintained at the expense of performance. There are however more options than you'd think to increase process control and efficiency in a potentially explosive atmosphere by using the latest valves, controllers and panel built solutions.

In terms of the individual components, manufacturers spend considerable amounts of time and effort in producing products that are certified for use in particular applications under specific conditions. In situations where the requirement is simply for a replacement part, it is a relatively easy task to ensure continued compliance with the regulations.

However, when there is a more wide ranging project, such as modifying an existing control system or building a completely new one, the task of delivering a fully certified installation is more complex and requires a wide range of skills and expertise. In such situations it is important to select partners that understand process control design with the ability to deliver bespoke solutions using the latest technology that is certified to the standards in force locally.

Leading manufacturer of control and measuring systems for fluids and gases, Bürkert Fluid Control Systems has developed ATEX and IECEx certified versions of its  components, as well as complete control systems, and has established of a centre of competence in Menden, Germany.

At the operational end, the ELEMENT valve controllers were initially designed to operate Bürkert's CLASSIC range of process valves and they are now rapidly becoming the global standard for process control, setting the benchmark for the major manufacturers. Having already been developed to control 3rd party process valves, the latest improvements include ATEX and IECEx approvals for operation in Zones 2/22 and 1/21 where potentially explosive atmospheres may exist.

Similarly, with such a wide variety of applications, the use of quarter turn valves has become widespread, but it is very important to ensure that the selection process is carried out carefully so as to avoid poor performance or incompatible equipment. Development of this commonly used valve actuator includes the Type 3004 actuator, which is classified as ATEX II 2 GD Ex d II B T6 and rated to IP67 and therefore suitable for installation in areas classified as Zone 1.

Centralised vs decentralised

The benefits of these individual components can only be properly appreciated when they are brought together within a comprehensive design structure that maximises their benefits. This can be accomplished with the AirLINE Ex 8650 which is one of the only electro-pneumatic automation systems designed for installation in Zone 1.

This system is particularly suited to decentralised process control tasks concerning fine chemicals, pharmaceuticals, cosmetics and oil & gas; it can be used for example to automate the filling of potentially volatile solvents, alcohol or lacquers. In these application areas, the system is unique, as it is the only compact electro-pneumatic automation solution allowing integration of EEx ia rated pneumatic valves without additional wiring.

When there is a requirement, but not a product or solution to fit it yet, then custom built is still an available route. By creating the Systemhaus concept, Bürkert provides experienced teams of designers, project managers and engineers who work together to produce innovative solutions.