The right solution for temperature, pollution and operating reliability
Overpressure and purge systems for control cabinets
In industrial environments, protecting a control cabinet is rarely a matter of one solution. Heat, dust and moisture often play a role simultaneously. The wrong choice leads to malfunctions, condensation or overheating of components.
Cooling and overpressure in control cabinets
Cooling and overpressure are often confused in practice, even though they have fundamentally different purposes.
Cooling is intended to remove heat generated by electrical components such as PLCs, power supplies and variable speed drives. Overpressure is intended to keep contaminated or moist air out of the cabinet.
Problems arise when the two are mixed up. A cabinet can be perfectly cooled, but still become contaminated by dust or moisture. Conversely, a cabinet can remain clean due to overpressure, but overheat due to insufficient cooling.
Kwadrant IA always determines the right solution based on the combination of environment, load and installation requirements. Not based on standard solutions.
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Our solutions for overpressure and purge systems
Depending on the application and environment, we provide different solutions. From protection against contamination to certified systems for explosive environments.
ATEX purge system (Ex p)
For applications in Zone 1 and Zone 2 where explosive atmospheres may be present. A purge system makes a standard switchgear cabinet suitable for safe operation through controlled overpressure and continuous monitoring.
Overpressure switch boxes
For industrial environments with dust, moisture or contamination. Controlled airflow and filtration keeps the internal environment of the cabinet clean and reliable.
Cooling vs overpressure
Not every situation requires the same solution. Sometimes ventilation or active cooling is needed, in other cases, overpressure. We determine the right solution based on the application and load of the cabinet.
Complete automation solutions
We realize control systems from design to delivery. By integrating engineering, panel construction, cabling and commissioning, we ensure quality, efficiency and international deployment.
When do you choose overpressure or a purge system?
The choice between a positive pressure or purge system depends on several factors. It is not just about the cabinet, but more importantly the environment in which it is used.
Important considerations include:
- Presence of dust, moisture or aggressive environments
- risk of explosive atmospheres (ATEX zone classification)
- type of components used (standard vs ATEX)
- availability and reliability requirements
- standardization, inspection requirements and certification
In practice, this is rarely a standard choice. Therefore, solutions at Kwadrant IA are always technically based and tailored to the specific business situation.
Engineering and application of overpressure and purge systems
Operation of overpressure and purge systems in control cabinets
In industrial automation, environmental influences play a major role in the reliability of a control cabinet. Electronic components such as PLCs, relays and frequency converters are sensitive to contamination, moisture and temperature differences. Without appropriate measures, this can lead to malfunctions, accelerated wear or equipment failure.
An overpressure system is used to prevent contaminated air from entering the cabinet. A slight overpressure and controlled airflow keeps the internal environment clean. This is particularly relevant in production environments where dust, fumes or moisture are present.
A purge system (Ex p) goes one step further and is used in explosive environments. Here, the control cabinet is first purged and then kept under continuous overpressure. This prevents an explosive atmosphere from entering the cabinet and allows standard components to be used safely within ATEX zones.
Application within ATEX and industrial environments
Zone classifications are used within ATEX environments, such as Zone 1 and Zone 2 for gas and Zones 21 and 22 for dust. These zones indicate the risk of an explosive atmosphere and determine which protective measures are necessary.
In situations where standard components are used within an ATEX zone, a purge system is often required to comply with guidelines and standards. This system must include pressure monitoring, detection and fail-safe features to ensure safety.
In less critical environments, where no explosion hazard is present but contamination or moisture is present, an overpressure system can provide adequate protection.
Design and engineering of systems
Designing an overpressure or purge system requires an integrated approach. Factors involved include:
- the sealing and construction of the housing
- airflow and positioning of fans
- filtering of incoming air
- temperature differences and condensation
- monitoring of pressure and system status
In addition, applicable standards and guidelines, such as ATEX 114 and IEC 60079, must be taken into account, depending on the application.
A well-designed system prevents failures, extends the life of components and ensures that installations continue to meet standards and inspection requirements.
Start your project with a technical consultation
We like to think with you from the initial design phase to realization and commissioning.
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Frequently asked questions about Overpressure and purge systems for control cabinets
What is the difference between an overpressure and a purge system?
An overpressure system protects against contamination and moisture by providing a slight overpressure inside the cabinet. A purge system (Ex p) is intended for explosive environments and prevents an explosive atmosphere from entering the cabinet.
When do I need a purge system?
A purge system is required when a switchgear cabinet with standard components is used in an environment where an explosive atmosphere may occur, such as in ATEX Zone 1 or Zone 2.
Can a standard control cabinet be used in an ATEX zone?
Not without additional measures. This can be done by applying explosion-proof components or a purge system that meets standards.
Is overpressure sufficient in an explosive environment?
In most cases, no. Overpressure without certification and monitoring does not meet the requirements for ATEX applications.
How do I determine the right solution for my situation?
It depends on the environment, zoning, components used and risk analysis. An engineering assessment is needed to make the right choice.
