M.A. Linda Münnig
17. Apr. 2018 (07:50) 
Cooperation in the field of filter testing in accordance to ISO 11057

Palas® GmbH and FilTEq GmbH from Karlsruhe agreed on a strong cooperation in the field of filter testing in accordance to ISO 11057. From now on, the two suppliers of filter test rigs cooperate intensively in the sector of testing cleanable filter media.

SAM_0341_bearbeitet.jpg With the test rig MMTC 2000 for cleanable filter media according to VDI 3926, Palas® offers the testing technology for fast quality control. With the reference system according to ISO 11057, FilTEq has developed a worldwide recognized system for testing in accordance to this guideline. According to the customers’ demands, FilTEq and Palas®, two well-known suppliers of filter test rigs, therefore can serve the entire spectrum. First, the cooperation starts in the field of Marketing and Sales and shall be expanded to Service and Maintenance and the building of test rigs, later.

The worldwide market leadership of both cooperation partners in this field will further be strengthened by this cooperation and the perfect testing method for cleanable filter media will be offered to the user from just a single source.

Contact FilTEq GmbH or Palas ® GmbH today!

Leander Mölter (managing director of Palas® GmbH) and Dr Peter Gäng (managing director of FilTEq GmbH)
Photo: Palas® GmbH
The availability of compact generators with superconducting rotor windings is an essential prerequisite for future realization of cost-effective wind turbines.

Logo DIAMANT.jpg Excessively high costs of the available technical high temperature superconductors have so far prevented the product launch for this application. To be in a position to produce the considerable quantities of superconductors affordably, the novel Aerosol Deposition Method (ADM, also known as aerosol-based cold deposition) is applied in the DIAMANT project to the extremely promising high temperature superconductor material magnesium diboride (MgB2). The project is promoted by the German Federal Ministry for Education and Research (BMBF).

In the ADM method, the starting powder is dispersed as a particle aerosol and is spread over the substrate material under high low-pressure using a nozzle. Due to the high kinetic energy of the particles at the impact, they densify in-situ at room temperature to form layers. This allows the deposition of several tens of µm thick superconducting layers with high density and homogeneity.

In the joint project, Palas®, together with the project partners of the Karlsruhe Institute for Technology (KIT), Siemens AG and the University of Bayreuth, conducts basic research on the layer deposition process. The newly developed aerosol generators - RBG 1000 SD and RBG 2000 SD - allow the researchers for the first time adjustable, reproducible and constant dispersion of various starting powder also at low pressures down to 300 mbar.

Due to the oxygen-sensitive starting powder the researchers value, the high vacuum sealing and the flexible operation of the RBG generators with inert carrier gases such as nitrogen, helium or forming gas. By integrating a welas® digital 2000 aerosol spectrometer from Palas® in the overall ADM system, the particle size distribution of the dispersed aerosol was determined in-situ during the process, immediately upstream of the deposition nozzle at negative pressures down to 300 mbar. The scientists were therefore able to understand the influence of the various operating modes of the RBG on the particle size distribution and the number concentration. This allows important conclusions to be drawn about the layer and superconductor properties.

After completion of the project, the new insights will be presented, e.g. at the upcoming Aerosol Technology Conference 2018 in Bilbao. Further publications in scientific journals are also planned.

» Further information on the DIAMANT project on the KIT website

As they are uncomplicated, they are already widely used.

The determination of filter efficiency and fraction separation efficiencies for size ranges < 300 nm is performed, among other means, by using electrical mobility classifiers (e.g. DEMC 2000) to provide particles of different sizes.

This involves applying a charge to the aerosol for functional reasons. As improved deposition on the filter can be attained with a charged aerosol than with an uncharged aerosol, the EN 1822 standard favors neutralizing the aerosol upstream of the filter.
Radioactive emitters, such as krypton 85, are established in practice for this purpose. The use of these emitters entails a good deal of bureaucracy and special safety measures are necessary. A handling permit has to be applied for and a radiation protection officer has to be nominated. Special training is also required, safe storage of the emitter has to be ensured, and more besides.

The Palas® engineer Mara Pfeffinger therefore investigated whether in filter testing with the MFP Nano plus test rig, instead of using a radioactive emitter, an X-ray emitter can also be used for neutralization of the aerosol. As they are uncomplicated, they are already widely used. It should also be investigated whether an X-ray emitter achieves the same performance in determining the filter efficiency and MPPS (most penetrating particle size) in the nanometer range as a radioactive emitter.

Bild für Hompage Artikel MP.JPG
Figure: Palas® investigation on neutralization of aerosols in filter testing with a radioactive emitter and a X-ray source

Mrs. Pfeffinger made measurements with the MFP Nano plus test rig with different filter media, both with the krypton emitter Kr-85-370, as well as with the X-ray emitter XRC 049 from Palas®. The result of the measurement series was that only very minor differences were to be ascertained between the two emitters. These were within the variability of the filter medium. “Further measurements need to be made with different filter media and settings to be absolutely sure, but to a first approximation it can be said that an X-ray emitter can also be used to neutralize the aerosol”, Mara Pfeffinger takes initial stock of her investigations.

For questions and further information, just send us a short e-mail.

About the discharge systems from Palas®:

Between 27 January and 3 February, Baden-Württemberg International (bw-i), the competence center of the federal state for opening up foreign markets, together with the federal state agency Umwelttechnik BW GmbH, organized a entrepreneurial visit to India.

PA-Indienreise_2018.JPG Figure: Participants of delegation journey Baden Württemberg International (bw-i) with the mayor of Karlsruhe Dr. Frank Mentrup. Photo: Let's Bridge IT, Ashish Pandit

The focus was on air pollution control, as well as on water and waste. In workshops and round-table discussions and visits to producing companies, the firms from Baden-Württemberg were able to present their solutions. Visits were made to the megacities of Mumbai and Pune, the partner city of Karlsruhe, along with the Solapur and Nagpur, also known as “second tier cities”, i.e. cities that have not been so much in focus to date.

For Palas®, especially air pollution control was of interest on this journey. As the Indian state is advancing the development of “smart cities” and these have to monitor air pollution control, good opportunities exist for the Fidas® series of certified fine dust measuring devices. Sales engineer Sven Schütz managed to make a number of interesting contacts on the journey. Agreements were concluded for testing Fidas® with the National Environmental Engineering Research Institute (NEERI), which also supervises the entire Indian measurement network.
To round off the journey, the Indian hosts celebrated the now 50-year-old partnership with their guests from Baden-Württemberg in a befitting way with the wine festival “Mumbai meets Stuttgart”.

Simone Brecht
17. Apr. 2018 (07:44) 
The Palas® GmbH thanks for the large number of visitors and great interest on the exhibition booth!

We look back on a successful week at Filtech in Cologne. We are very pleased by the high visitor count and the consistently positive feedback with interesting conversations. It drives us further on to be a competent partner for you in the filter testing.



We are very pleased about the huge interest shown by our customers and prospects at this year’s FILTECH from 13 to 15 March in Cologne. With more than 150 visitors, the Palas® booth was the center of filter testing technology at this international trade show, as in previous years.


Among the new products, the focus was on the LSPG 16890 salt generator for fraction separation efficiency measurement of filter media in accordance with the ISO 16890 method, as well as on the new LDD 100 H dilution system for defined dilution of droplets larger than 7 µm. This is also available as a heatable version for the blow-by measurement on the motor. In addition, the new Promo® LED 2000 was presented which, with a new LED light source. The associated particularly long lifetime of the LED light source offers important advantages for the particle size analysis in process control.

We carried out measurements for our customers on three functional test rigs for HEPA / ULPA filter media, for testing in accordance with ISO 16890 and rapid fraction separation efficiency for quality control. The demonstration of measurement technology in practical use was convincing. Once again, Palas® was therefore the only exhibitor able to present the three functional test rigs at FILTECH.


A very special feature is the new booth design, which has been well received and also often praised. This also contributed to the well-being of our customers on the booth.

We are looking forward to welcome you at the next Filtech from October 22th - 24th, 2019!

Photos: Palas® GmbH