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HET Features

For best protection of personnel and product

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HET Features

Our experience makes the difference

Safety and reliability are the top priorities for our filter systems. We are aware that the cleaning and maintenance of this equipment can be potentially dangerous, as there is a possibility of unintentional release of active substances. For this reason, we have paid the greatest attention to comprehensively protecting the operating personnel at this critical point from the hazardous substances.

To achieve this goal, we use modern technologies such as Restricted Access Barrier Systems (RABS) and Wash In Place (WIP) in our plants where the highest demands are made on the protection of operating and maintenance personnel.

TOP FEATURES

Optimally equipped for your containment requirements

Our filtration systems feature state-of-the-art technologies that ensure maximum protection and safety for operators during cleaning and maintenance.

GMP compliant construction

Housing

Filter housing

Leak test

Housing

Through the wall

OTHER FEATURES

Clamping device

Filter qualification

Explosion protection

Dust discharge

Safe Change

Cleaning without removal

Restricted Access Barrier System

Independent control system

Extended documentation

Accessories and services

For safe and easy handling of your filter system

Our extensive range of accessories includes high-quality filter media, performance monitoring sensors, automated control systems and ergonomically designed control panels that optimize the efficiency and user-friendliness of our filtration systems.

Filter systems

Filter change

Housing

Qualified DEHS measurement

Housing

For your staff

HETservices

Our service offers you comprehensive advice on the subject of filter systems

Services

HET Filter systems

Our product variety

Tailored to your area of application, we can supply you with filter systems and filter cells from a single source. The modular design of our filter systems gives you a wide variety of options.

HET Filter systems

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GMP compliant construction

The system housing is designed to be GMP-compliant. Protrusions and undercuts were avoided where technically feasible.

Raw gas hoppers, dust discharge and maintenance doors are enclosed, providing easy-to-clean surfaces. Furthermore, the back of the plant with raw gas duct and WIP system is also clad.

GMP compliant construction

The system housing is designed to be GMP-compliant. Protrusions and undercuts were avoided where technically feasible.

Raw gas hoppers, dust discharge and maintenance doors are enclosed, providing easy-to-clean surfaces. Furthermore, the back of the plant with raw gas duct and WIP system is also clad.

Housing

Filter housing

The welded filter housing is made of S235JR and powder coated in RAL 7035.
The bolted filter housing is made of S235JR and powder coated in RAL 7035. The welded filter housing is made of stainless steel 1.4301 (AISI 304). The welded filter housing is made of stainless steel 1.4404 (AISI 316). The welded filter housing is made of stainless steel 1.4571 (AISI 316Ti). All welds are pickled and passivated.

To obtain a uniform surface appearance, the filter housing is glass bead blasted. The filter housing is completely ground. (The micrograph has a vertical / horizontal arrangement. All weld seams are, if possible, ground to a flat surface. Special features of the filter housing:

  • Viewing window for a functional check of the cleaning and for monitoring the filter gap
  • Raw gas funnel with steep slope angles
  • Pneumatic double acting raw gas dampers, make EBRO
  • Delivery as prefabricated and functionally tested plant
  • Pneumatic clean gas flaps for each post-filter chamber
  • Manual clean gas flaps for each post-filter chamber

Housing

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The welded filter housing is made of S235JR and powder coated in RAL 7035.
The bolted filter housing is made of S235JR and powder coated in RAL 7035. The welded filter housing is made of stainless steel 1.4301 (AISI 304). The welded filter housing is made of stainless steel 1.4404 (AISI 316). The welded filter housing is made of stainless steel 1.4571 (AISI 316Ti). All welds are pickled and passivated.

To achieve a uniform surface appearance, the filter housing is glass bead blasted. The filter housing is completely ground. (The micrograph has a vertical / horizontal arrangement. All weld seams are, if possible, ground to a flat surface. Special features of the filter housing:

  • Viewing window for a functional check of the cleaning and for monitoring the filter gap
  • Raw gas funnel with steep slope angles
  • Pneumatic double acting raw gas dampers, make EBRO
  • Delivery as prefabricated and functionally tested plant
  • Pneumatic clean gas flaps for each post-filter chamber
  • Manual clean gas flaps for each post-filter chamber

Leak test

Dust-tightness: Due to the closed design and operation under negative pressure, it is ensured that no dust particles can leave the filter housing.

Gas tightness: A defined leakage of <1% of the housing volume is guaranteed within 6 minutes, based on a test pressure of 2,000 Pa.

Leak test

Dust-tightness: Due to the closed design and operation under negative pressure, it is ensured that no dust particles can leave the filter housing.

Gas tightness: A defined leakage of <1% of the housing volume is guaranteed within 6 minutes, based on a test pressure of 2,000 Pa.

Through the wall

Through the Wall: The filter housing is enclosed by a circumferential stainless steel frame (L-profile), which allows flush integration into a cleanroom wall, for example.

Through the wall

Through the Wall: The filter housing is enclosed by a circumferential stainless steel frame (L-profile), which allows flush integration into a cleanroom wall, for example.

Clamping device

Our HETlock clamping device provides functional safety against unintentional lifting of the filter cell and enables fast and ergonomic filter changes.

The following features distinguish this system:

  • Four springs, each with a force of 450N, ensure that the filter cell is pressed on evenly, tightly and securely.
  • Pneumatic cylinders are used to lift the filter cell when changing filters.
  • The compressed air connections required for this can only be reached when the maintenance door is open.
  • The filter change itself is carried out according to the drawer principle.
  • The filter cells with steel frames are positively grounded via the conductive guide rails.
  • The filter cells with wooden frames are conductively connected to the housing via a grounding cable.
  • For hybrid mixtures or from a Kst value of >300 bar*m/s, the pressing device is equipped with a blocking slide.

Bracket maintenance cover

The maintenance cover for the primary and secondary filter stages is equipped with a swiveling bracket that allows the maintenance cover to be conveniently swiveled to the side after opening without it getting in the way during activities on the filter module.

Clamping device

Our HETlock clamping device provides functional safety against unintentional lifting of the filter cell and enables fast and ergonomic filter changes.

The following features distinguish this system:

  • Four springs, each with a force of 450N, ensure that the filter cell is pressed on evenly, tightly and securely.
  • Pneumatic cylinders are used to lift the filter cell when changing filters.
  • The compressed air connections required for this can only be reached when the maintenance door is open.
  • The filter change itself is carried out according to the drawer principle.
  • The filter cells with steel frames are positively grounded via the conductive guide rails.
  • The filter cells with wooden frames are conductively connected to the housing via a grounding cable.
  • For hybrid mixtures or from a Kst value of >300 bar*m/s, the pressing device is equipped with a blocking slide.

Bracket maintenance cover

The maintenance cover for the primary and secondary filter stages is equipped with a swiveling bracket that allows the maintenance cover to be conveniently swiveled to the side after opening without it getting in the way during activities on the filter module.

Filter qualification

The filter system is equipped with DEHS lances for qualifying the separation efficiency of the first and second filter stages:

  • Test medium application in the raw gas channel
  • Measuring lance for raw gas concentration determination in the hopper
  • Measuring lances (3 pieces) after the primary filter stage for qualification
  • Ring line for uniform feeding of the raw gas concentration upstream of the secondary filter stage
  • Measuring lance for raw gas concentration determination
  • Measuring lances (5 pieces) after the safety filter stage for qualification

The secondary filter stage is designed with the so-called tightness test. A test overpressure is applied to the test groove covered by the filter seal. The correct seating of the filter cell is validated by measuring the leakage flow (<16 l/h).

Filter qualification

The filter system is equipped with DEHS lances for qualifying the separation efficiency of the first and second filter stages:

  • Test medium application in the raw gas channel
  • Measuring lance for raw gas concentration determination in the hopper
  • Measuring lances (3 pieces) after the primary filter stage for qualification
  • Ring line for uniform feeding of the raw gas concentration upstream of the secondary filter stage
  • Measuring lance for raw gas concentration determination
  • Measuring lances (5 pieces) after the safety filter stage for qualification

The secondary filter stage is designed with the so-called tightness test. A test overpressure is applied to the test groove covered by the filter seal. The correct seating of the filter cell is validated by measuring the leakage flow (<16 l/h).

Highest explosion protection

Ex100

The filter system is electrically conductive and does not generate its own ignition sources.

Ex200

Due to its explosion pressure shock resistant design, the filter system offers constructive explosion protection based on the principle of partial filling. The explosion pressure is relieved internally via the filter cells, which also serve as an effective flame arrester.

Dusts with a specific pmax of 10 bar can be handled, as the pressure surge is reduced internally to 1 bar. Due to this internal pressure relief, the system does not suffer any permanent damage even in the event of an explosion.

The offered filter unit is designed according to ATEX Directive 2014/34/EU and approved and certified by FSA Mannheim, notified body 0558.

In the event of an explosion, no permanent deformation occurs according to the explosion test, even with dusts up to a Kst value of 590 bar*m/s.

From a Kst value of 300 bar*m/s, a blocking slide valve for the primary filter cell and a flap monitoring system must be provided for this purpose.

After internal cleaning, filter replacement and functional testing, the filter system can continue to be operated without any further measures.

In the event of an explosion, no permanent deformation occurs according to the explosion test, even with dusts up to a Kst value of 590 bar*m/s.

From a Kst value of 300 bar*m/s, a blocking slide valve for the primary filter cell and a flap monitoring system must be provided for this purpose.

After internal cleaning, filter replacement and functional testing, the filter system can continue to be operated without any further measures.

Special Features:

  • In the event of a dust explosion, the filter housing is not damaged
  • The special arrangement of the filter cells acts as an effective flame arrester to prevent ignition on the clean gas side
  • Explosion pressure and heat are dissipated via the filter cells.

No external pressure relief or explosion suppression measures are required, which is a huge cost advantage.

Highest explosion protection

Ex100

The filter system is electrically conductive and does not generate its own ignition sources.

Ex200

Due to its explosion pressure shock resistant design, the filter system offers constructive explosion protection based on the principle of partial filling. The explosion pressure is relieved internally via the filter cells, which also serve as an effective flame arrester.

Dusts with a specific pmax of 10 bar can be handled, as the pressure surge is reduced internally to 1 bar. Due to this internal pressure relief, the system does not suffer any permanent damage even in the event of an explosion.

The offered filter unit is designed according to ATEX Directive 2014/34/EU and approved and certified by FSA Mannheim, notified body 0558.

In the event of an explosion, no permanent deformation occurs according to the explosion test, even with dusts up to a Kst value of 590 bar*m/s.

From a Kst value of 300 bar*m/s, a blocking slide valve for the primary filter cell and a flap monitoring system must be provided for this purpose.

After internal cleaning, filter replacement and functional testing, the filter system can continue to be operated without any further measures.

In the event of an explosion, no permanent deformation occurs according to the explosion test, even with dusts up to a Kst value of 590 bar*m/s.

From a Kst value of 300 bar*m/s, a blocking slide valve for the primary filter cell and a flap monitoring system must be provided for this purpose.

After internal cleaning, filter replacement and functional testing, the filter system can continue to be operated without any further measures.

Special Features:

  • In the event of a dust explosion, the filter housing is not damaged
  • The special arrangement of the filter cells acts as an effective flame arrester to prevent ignition on the clean gas side
  • Explosion pressure and heat are dissipated via the filter cells.

No external pressure relief or explosion suppression measures are required, which is a huge cost advantage.

Dust discharge

Low-contamination dust discharge with coverable plastic bag in mobile 20 l barrel with quick-change device.

Special features of dust discharge:

  • Manual shut-off flap on each dust outlet
  • The lever of the pressing device is blocked by the manual shut-off flap to prevent incorrect operation and to ensure safety when changing the dust container.

To change the plastic bag, loosen the barrel and close the liner with the snap-on handle lid. This allows the full dust bag to be lifted out and replaced.

Dust discharge

Low-contamination dust discharge with coverable plastic bag in mobile 20 l barrel with quick-change device.

Special features of dust discharge:

  • Manual shut-off flap on each dust outlet
  • The lever of the pressing device is blocked by the manual shut-off flap to prevent incorrect operation and to ensure safety when changing the dust container.

To change the plastic bag, loosen the barrel and close the liner with the snap-on handle lid. This allows the full dust bag to be lifted out and replaced.

Highest containment level due to safe filter replacement

Circumferential double groove profiles on the filter openings for filter change using Safe Change technology. (bag-in-bag-out)

The filter bags are designed as foil bags made of polyethylene with gridded black strips consisting of polyethylene and carbon powder. This gives the filter bag dissipative properties and makes it suitable for combustible dusts and gases.

In addition, the foil bag is provided with welded-in side pockets to facilitate handling during filter change and to shorten the process time.

The rubber rings for fastening the bag in the double groove profile are designed as hollow cord rings, which ensures that the bag sits firmly and securely in the groove profile of the change frame. A tab on the rubber ring ensures easier handling during filter change.

Highest containment level due to safe filter replacement

Circumferential double groove profiles on the filter openings for filter change using Safe Change technology. (bag-in-bag-out)

The filter bags are designed as foil bags made of polyethylene with gridded black strips consisting of polyethylene and carbon powder. This gives the filter bag dissipative properties and makes it suitable for combustible dusts and gases.

In addition, the foil bag is provided with welded-in side pockets to facilitate handling during filter change and to shorten the process time.

The rubber rings for fastening the bag in the double groove profile are designed as hollow cord rings, which ensures that the bag sits firmly and securely in the groove profile of the change frame. A tab on the rubber ring ensures easier handling during filter change.

Wash in Place

WIP allows cleaning without dismantling the device. This provides a high level of protection for operators and maintenance personnel from contact with hazardous materials. And through a strict formulation of cleaners, pressures, temperatures and intervals, a precisely repeatable cleaning process has been developed.

Wash in Place

WIP allows cleaning without dismantling the device. This provides a high level of protection for operators and maintenance personnel from contact with hazardous materials. And through a strict formulation of cleaners, pressures, temperatures and intervals, a precisely repeatable cleaning process has been developed.

Restricted Access Barrier Systems

The requirements for RABS systems are precisely defined by the ISPE (International Society for Pharmaceutical Engineering). These include barriers that reliably shield personnel from direct contact in critical zones.

For example, we use glove ports in our plants. And in the rare cases where highly automated processes and well-defined safety procedures require so-called open-door interventions, we make sure that best practices are taken into account.

Restricted Access Barrier Systems

The requirements for RABS systems are precisely defined by the ISPE (International Society for Pharmaceutical Engineering). These include barriers that reliably shield personnel from direct contact in critical zones.

For example, we use glove ports in our plants. And in the rare cases where highly automated processes and well-defined safety procedures require so-called open-door interventions, we make sure that best practices are taken into account.

Independent tax system

Independent control system with:

  • Automatic cleaning depending on
  • Time interval and differential pressure
  • HMI Touch Panel
  • Filter differential pressure monitoring
  • Alarm evaluation

and much more...

Independent tax system

Independent control system with:

  • Automatic cleaning depending on
  • Time interval and differential pressure
  • HMI Touch Panel
  • Filter differential pressure monitoring
  • Alarm evaluation

and much more...

Extended documentation

Extended documentation for the pharmaceutical sector :

  • Function and design specifications
  • Required documentation for DQ, IQ, OQ and PQ
  • Equipment and spare parts lists
  • Material certificates

Extended documentation

Extended documentation for the pharmaceutical sector :

  • Function and design specifications
  • Required documentation for DQ, IQ, OQ and PQ
  • Equipment and spare parts lists
  • Material certificates

Filter systems

Working filter cell(s) of filter class H13 / H14, cleanable as high-performance filter cells. Safety filter cell(s) of filter class H13 / H14 for the safety afterfilter.

Filter systems

Working filter cell(s) of filter class H13 / H14, cleanable as high-performance filter cells. Safety filter cell(s) of filter class H13 / H14 for the safety afterfilter.

Easy and safe filter change due to perfect storage possibility of the filter

Filter change - simple and safe. The HETdesk is the ideal solution for easy and safe filter change. It is mounted directly on the open maintenance door, the filter cell can be conveniently removed and pulled onto the HETdesk. As a perfect intermediate storage system, it provides additional safety when disconnecting and stowing the dust-laden filter cell during a filter change.

The advantages:

  • Easy and safe filter change due to perfect storage possibility of the filter
  • Suitable for all HET HEPA filter systems with 610 x 610 x 292 mm filters
  • Manufactured in stainless steel, ideal for GMP applications
  • Small footprint and easy to store
  • No additional accessories necessary

Easy and safe filter change due to perfect storage possibility of the filter

Filter change - simple and safe. The HETdesk is the ideal solution for easy and safe filter change. It is mounted directly on the open maintenance door, the filter cell can be conveniently removed and pulled onto the HETdesk. As a perfect intermediate storage system, it provides additional safety when disconnecting and stowing the dust-laden filter cell during a filter change.

The advantages:

  • Easy and safe filter change due to perfect storage possibility of the filter
  • Suitable for all HET HEPA filter systems with 610 x 610 x 292 mm filters
  • Manufactured in stainless steel, ideal for GMP applications
  • Small footprint and easy to store
  • No additional accessories necessary

Qualified DEHS measurement

HETperformance stands for various options for checking the filter system in terms of design, functionality and safety.
These criteria are also important in the pharmaceutical industry:

  • Is the plant and its components built safely?
  • Can it be used in explosive atmospheres?
  • Is the plant tight?
  • Can it be used in clean rooms?
  • Do any hazards emanate from the plant?
  • Can it be used under containment conditions?
  • Does the system serve its purpose?
  • Can it filter the hazardous substances out of the air reliably and efficiently?
    At the core of HETperformance are measurements and validations of the filter system for both optimization and protection of employees and the environment.

Qualified DEHS measurement

HETperformance stands for various options for checking the filter system in terms of design, functionality and safety.
These criteria are also important in the pharmaceutical industry:

  • Is the plant and its components built safely?
  • Can it be used in explosive atmospheres?
  • Is the plant tight?
  • Can it be used in clean rooms?
  • Do any hazards emanate from the plant?
  • Can it be used under containment conditions?
  • Does the system serve its purpose?
  • Can it filter the hazardous substances out of the air reliably and efficiently?
    At the core of HETperformance are measurements and validations of the filter system for both optimization and protection of employees and the environment.

For your staff

HETtraining offers customers the opportunity to get the most out of their dust collection systems. With a balanced mix of theoretical knowledge and practical skills, our training enables operators to handle their filter systems in the best possible way.

The theoretical part covers a wide range of topics, including dust collection system technologies, Atex and explosion protection technology, containment for user and product protection, and the safe storage and disposal of filters. This in-depth understanding creates a solid foundation for efficient plant operation.

The practical part deals with the filter system operation. From basic handling techniques to troubleshooting scenarios, we provide hands-on experience to ensure that any problem can be solved. In particular, the safe-change filter change and dust discharge change are practiced intensively to ensure maximum safety and efficiency.

For your staff

HETtraining offers customers the opportunity to get the most out of their dust collection systems. With a balanced mix of theoretical knowledge and practical skills, our training enables operators to handle their filter systems in the best possible way.

The theoretical part covers a wide range of topics, including dust collection system technologies, Atex and explosion protection technology, containment for user and product protection, and the safe storage and disposal of filters. This in-depth understanding creates a solid foundation for efficient plant operation.

The practical part deals with the filter system operation. From basic handling techniques to troubleshooting scenarios, we provide hands-on experience to ensure that any problem can be solved. In particular, the safe-change filter change and dust discharge change are practiced intensively to ensure maximum safety and efficiency.