sefiso
About us
At sefiso, the focus lies on advancing the science of clean fuel and efficient filtration. As a trusted partner across the globe, the company delivers high‑performance solutions that help protect critical equipment, increase operational reliability, and meet the most stringent quality requirements.
The portfolio includes cutting‑edge air, gas, liquid, and fuel filtration technologies, engineered to ensure consistent cleanliness and optimized system performance. Sensor, control, and monitoring technologies add clarity and efficiency to fuel handling and filtration, while filter vessels further strengthen fuel system protection. With fuel cleanliness more important than ever, these vessels support long‑term performance and contribute to smooth, dependable operations.
Supported by decades of technical expertise, all products are built to withstand demanding industrial environments while maintaining exceptional efficiency and durability. Across sectors including aviation, diesel applications, chemical processing, petrochemicals, utilities, manufacturing, automotive, pharmaceuticals, and food & beverage, sefiso solutions contribute to clean, reliable, and efficient system performance.
Products
Vertical Filter Housing
The Vertical Filter Housing (VFH) assembly provides two element options to meet the requirements in the aviation fuel filtration industry: Coalescer/Separator and Microfilter (Prefilter). The VFH system fascinates by high economic efficiency as well as an easy installation. It is designed and constructed for easy element change-out. For use with JET Fuel, AVGAS and MoGas.
Coalescer Separator Elements
The two stage filter system comprises a coalescer and a separator element. The coalescer/separator filter system removes water and contaminants from fuels and other hydrocarbons. sefiso CS-Type coalescer/separator filters are intended for use in Vertical Filter Housings (VFH) on refuellers, hydrant dispensers, other mobile and stationary refuelling equipment.
Electronic Bulk Water Sensor SLUGGUARD
Electronic Bulk Water Sensor to distinguish between diesel fuel and water. The SLUGGUARD® enables continuous detection of water in sumps of filter/water separators or in drain points of filter vessels. The high-precision switch is also suitable for compact filter housings. A blue LED light indicates operating or alarm switching states.
Electronic Water Sensor AFGUARD®
AFGUARD® Electronic Water Sensor (EWS) is leading in aviation fuel condition monitoring. The sensor provides the required assurance that every single litre of fuel delivered to the aircraft is monitored and prevents water from reaching the aircraft by triggering a deadman shut down when it detects water concentrations beyond the configured threshold. AFGUARD® can be used in conjunction with all aviation fuel filtration technologies at aircraft refueling. The sensor is considered fail-safe and hazardous area (ATEX and IECEx) approved. AFGUARD® is qualified for use as an alternative to Chemical Water Detectors (CWD). Accepted by Joint Inspection Group (JIG) Recommended by IATA Fuel Quality Pool (IFQP) The sensor system complies with the ISO 13849 standard Required in conjunction with EI 1599 Dirt Defence filter elements Recommended for use downstream of all filtration technologies to verify filter performance (PerformanceBasedFilterLife™)
Conductivity Monitoring MLA 900
The MLA 900 has been developed to measure the electrical conductivity and temperature of fuels and light mineral oils in a wide range of applications. Sampling from the roof of a storage tank to laboratories, fuel loading racks and at the wing of an aircraft where intrinsically safe hazardous area regulations apply.
Conductivity Stick CUGUARD
Offering improved accuracy, the patented AC technology used by the sefiso CUGUARD eliminates the guess work when taking a conductivity measurement. DC devices which never reach equilibrium experience a large inrush current which then slows as polarization voltage builds on the two measurement electrodes. This results in zero flow as charges on the electrodes form an infinite impedance. This means a DC device must guess when the current flow is representative of the fluid’s ability to conduct. Movement of a DC sensor when taking the test will also dramatically affect the result. The AC (patented) technology continuously varies the voltage from one electrode to another, so no polarization occurs which makes the measurement flow insensitive. This allows many measures to be taken over a number of cycles resulting in very high precision.
Automatic Portable Particle Counter
Features - Field Portable and Laboratory Use Light Obscuration Particle Counter - ISO 11171:2020 Calibrated - ASTM D7619 Equivalent - ISO 4406 Reporting - Optional Conductivity & Density - High Resolution Color Display - Simple Two Button Operation - Military Hardened and Ruggedized for Field Operation (Drop Tested) - High Speed Flush - Back Flush Capable - 1620 Hydraulic Sample Couplings - 110/240 VDC or Battery Powered - Sample/Location Identifier Input - Waterproof IP67
Digital Free Water Detector Hydro-Light
The JF-WA1 Hydro-Light ASTM D3240 Digital Free Water Detector for Jet Fuel revolutionises the testing of free water in aviation fuel. The Hydro-Light provides results efficiently through a straightforward, one-step measurement process. Simply place the pad in the slide, insert the slide into the machine, and read the digital display, which indicates the free water content of the fuel up to 50 PPM. This device is utilised to conduct the ASTM Test Method D3240. The Hydro-Light significantly enhances the accuracy and reliability of the ASTM D3240 test method by eliminating human error and delivering digital results.
Job ads
Apprenticeship and Dual Study
Start your career at sefiso | FAUDI Aviation! As a future-oriented company, supporting younger generations is an important responsibility for us. We offer you the opportunity to start your career in an international company and the chance to be successful with us. At FAUDI Aviation, every team member is as important as the next because every achievement is part of our success. We count on motivated and inspiring personalities, looking to shape the future of aviation fuel filtration with us!
Quality assurance/ Management specialist (m/f/d)
Job location: Stadtallendorf ▸ starting now ▸ Full time FAUDI Aviation GmbH is a family-owned, medium-sized company specialized in the filtration of civil and military aviation fuels. Our product portfolio consists of over 850 products distributed in more than 80 countries worldwide. Founded in 1938, FAUDI Aviation is today the leading premium brand that stands for quality, innovation and safety. Behind the brand, teams of both young and experienced employees work on the technological challenges of tomorrow.
Purchasing (m/f/d)
Job location: Stadtallendorf ▸ Starting now ▸ Full-time, fixed-term FAUDI Aviation GmbH is a family-owned, medium-sized company specialized in the filtration of civil and military aviation fuels. Our product portfolio consists of over 850 products distributed in more than 80 countries worldwide. Founded in 1938, FAUDI Aviation is today the leading premium brand that stands for quality, innovation and safety. Behind the brand, teams of both young and experienced employees work on the technological challenges of tomorrow. We are looking for a temporary employee (m/f/d) for administrative tasks in purchasing to start as soon as possible – ideal for students (m/f/d), for example. Other interested parties are also welcome to apply.