Electrostatic oil mist separators for industrial processes
Electrostatic oil mist separators offer a particularly efficient solution for air pollution control of fine aerosols. Hengst has decades of experience in electrostatic filter technology and is one of the leading suppliers in this field. On this page you will find an overview of our products as well as practical information on the selection, use and effectiveness of electrostatic separation technology.
Clean air is crucial for the protection of employees and machines. Electrostatic oil mist separators filter even the finest particles efficiently, minimize health risks and extend the service life of your systems. Rely on our technology for a safe and sustainable working environment.
Electrostatic oil mist separators use electrically charged plates to attract and filtrate fine oil mist particles. This effectively cleans the air.
Compared to mechanical oil mist separators (LINK), which capture particles with filters, electrostatic systems offer greater efficiency with fine particles. They are low-maintenance and durable - ideal for industrial applications where clean air is essential for people and machines.
| Nominal volume flows | Up to 100,000 m³/h |
| Type of construction | Central or machine extraction |
| Technology | Electrostatic |
| Areas of application | Oil mist, emulsion mist, oil smoke, oil vapor |
| Features | Easy retrofit, independent CE declaration |
What are the benefits of electrostatic oil mist separators from Hengst?
We understand the challenges of maintaining a clean and efficient industrial environment. That's why our electrostatic oil mist separators are designed to combine outstanding performance with reliability.
Filtration and energy efficiency
Our electrostatic oil mist collectors use electrically charged plates to capture fine oil mist particles effectively and with minimal energy consumption. This ensures safe air quality and reduces operating costs.
Broad portfolio
Our modular product portfolio covers a wide range of airflow capacities and ensures consistent and efficient performance for every process - regardless of the oil mist load.
Easy operation and maintenance
Our electrostatic oil mist separators allow easy access to the components. With our intelligent control system, operation is child's play. This minimizes downtime and operational interruptions.
Customization and flexibility
We adapt our electrostatic oil mist separators to specific industrial environments and changing requirements - providing customized solutions for your individual needs.
How do electrostatic oil mist separators work?
- Inlet of the oil mist:
The contaminated air with fine oil droplets (oil mist) is sucked into the device. - Ionization of the particles:
In the first step, the air flows through a high-voltage electric field between positively charged wires or plates.
This electrically charges (ionizes) the oil particles - Filtration through electrostatic attraction:
The charged particles now pass between oppositely charged collecting plates (e.g. negatively charged).
The electrostatic force causes the particles to "stick" to the plates. - Outflow of the separated oil:
The oil droplets collect on the plates, flow off and can be discharged or reused. - Purified air outlet:
The air freed of oil leaves the appliance - usually almost particle-free and clean.
Other frequently asked questions about our electrostatic oil mist separators
What are the dangers of oil mist in CNC machining and other industrial processes?
Oil mist can irritate the respiratory tract, cause skin problems and is suspected of being harmful to health in the long term. At the same time, it pollutes machines, electronics and surfaces - which can lead to breakdowns and higher maintenance costs.
Targeted extraction not only protects people and machines, but is now state of the art in modern production environments. In addition, there are clear legal requirements that regulate the handling of cooling lubricant emissions - more on this in the section "Which legal requirements are relevant for oil mist extraction?".
What are the differences between electrostatic oil mist separators and mechanical oil mist separators?
Electrostatic oil mist separators are particularly suitable for applications with fine particles and a constant amount of mist - e.g. when working with non-water-miscible oils or in processes with high speeds. They offer high filtration efficiency and are ideal for dry environments with constant conditions.
Mechanical oil mist separators, on the other hand, are more robust against changing ambient conditions, such as strongly fluctuating humidity or emulsion mist. They work with filter systems and are versatile - e.g. in general machining or when tools are opened frequently.
In short: Electrostatic systems are efficient for fine, oily aerosols - mechanical systems offer more tolerance in difficult environments. Selection should always be based on the process in question.
What particle sizes can be reliably filtrated?
Electrostatic oil mist separators are particularly effective for fine aerosols in the 0.1 to 2.5 micrometer range - exactly where mechanical filters reach their limits. Even ultra-fine particles below 1 µm are reliably filtrated by electrostatic attraction. This means that even critical fine dust and oil mist can be efficiently removed from the air.
How much Air flow do I need?
- the size and tightness of the machine housing
- the desired air exchange rate (e.g. 100-300 changes per hour)
- the frequency of door openings
- the type of oil mist
- as well as the amount of mist or smoke
Does CE conformity also apply to retrofit solutions?
Yes - in the case of retrofit solutions, i.e. the retrofitting of machine extraction systems to existing systems, a separate CE declaration of conformity is issued for the oil mist separator. This is because, in such cases, the filtration unit is considered to be an independent machine within the meaning of the Machinery Directive.
Hengst therefore supplies these devices with their own CE marking and - if required - with a main switch and emergency stop function. This ensures that all safety requirements are met - even when retrofitting.
What legal regulations apply to the extraction of oil mist?
- DGUV Rule 109-003: Requirements for workplaces with cooling lubricants - including specifications for extraction technology
- DGUV Rule 109-002: Technical requirements for ventilation systems, e.g. maintenance, filter classes, backflow protection
Can systems be adapted to special space conditions?
Yes, definitely. Adapting to confined or special installation situations is part of Hengst's daily business. We regularly develop special designs that are precisely tailored to your spatial conditions and project requirements.
Simply contact us - we will be happy to advise you on individual solutions.
Does Hengst also offer installation and commissioning?
Yes, Hengst offers both the installation and commissioning of electrostatic oil mist separators. Thanks to our worldwide service network, we are flexible and can be on site quickly - whether for individual systems or complex system solutions. Our experienced technicians ensure professional integration into your processes and smooth commissioning.
