Delfin DM2 1/3D INERT
Single-phase ATEX vacuum for Zone 22 with INERT neutralisation bath -- bypass motor, 44 L total tank in AISI 304, HEPA H14 final filter
- Larger ammunition facilities and military production sites
- Central cleanup after 3D printing and powder metallurgy in Zone 22
- Light-metal machining in aerospace: aluminium and titanium grinding
- Process plants with pyrophoric powders and Zone 22 classification
- Battery production with reactive anode metals in ATEX areas
- ATEX Directive 2014/34/EU -- II 1/3D Ex h tb IIIC T80°C (Int) /T95°C (ext) Da/Dc
- EN 17348:2022 (harmonized March 2023)
- IEC 60335-2-69 (industrial vacuums)
Delfin DM2 1/3D INERT
The Delfin DM2 1/3D INERT is the larger model in the DM2 series: 37 litres of neutralising liquid bath (44 L total tank) in AISI 304, 360 m³/h airflow from a single-phase bypass motor at 2.3 kW, and HEPA H14 final filtration with 26,000 cm² filter surface. ATEX-certified for Zone 22 with internal Zone 20 (II 1/3D Ex h tb IIIC). Used where collection volume and airflow are critical -- central cleanups after light-metal machining, larger ammunition facilities, and process plants with pyrophoric powders where Zone 22 is the norm.
Applications
- Larger ammunition facilities and military production sites
- Central cleanup after 3D printing and powder metallurgy in Zone 22
- Light-metal machining in aerospace: aluminium and titanium grinding
- Process plants with pyrophoric powders and Zone 22 classification
- Battery production with reactive anode metals in ATEX areas
Technical specifications
| ATEX marking | II 1/3D Ex h tb IIIC T80°C (Int) /T95°C (ext) Da/Dc |
|---|---|
| Internal / external zone | 20 / 22 |
| Motor type | 1-faset bypass-motor (2,3 kW, 10 A) |
| Duty cycle | Periodic |
| Airflow | 360 m³/h |
| Vacuum | 245 mbar (2500 mmH₂O) |
| Container | 44 L |
| Sound pressure | 74 dB(A) |
| Filter class | H class |
| Filter type | HEPA H14 (EN 1822-5), 99,995 % MPPS, 26.000 cm² filterflade |
| Primary filter | Stjerne/taske polyester ANT M-klasse antistatisk, 30.000 cm², diameter 500 mm |
| Cleaning system | Manuel filterrensning + indikator for tilstopning |
| Collection system | INERT neutralisation bath |
| Material | AISI 304 rustfrit staal (beholder) |
| IP class | IP64 |
| Power | 2.3 kW |
| Current | 10 A |
| Voltage | 230 V / 50-60 Hz |
| Inlet | Ø 50 mm |
| Dimensions (L × W × H) | 770 x 660 x 1680 mm |
| Weight | 90 kg |
INERT TECHNOLOGY — EN 17348:2022
What is an INERT vacuum cleaner?
Delfin's INERT vacuum cleaners are built to collect reactive metallic dust — the kind of dust that can self-ignite or react violently with oxygen, heat or water. Instead of collecting dust dry in a bag or container, the vacuum channels it directly into a neutralising liquid bath (typically water with a passivating agent added), where the reactive metal particle is inactivated on the spot. That is the difference between a controlled process and a vacuum that can itself become the ignition source.
Tested to EN 17348:2022
The INERT range is certified and performance-tested to EN 17348:2022, the harmonized European standard for industrial vacuum cleaners in ATEX zones. The test confirms that the neutralisation system actually inactivates reactive dust under real operating conditions — not merely in a lab setup. Combined with HEPA H14 final filtration (99.995 % efficiency at MPPS per EN 1822-5), the exhaust is clean down to the finest health-hazardous particles.
Typical applications
INERT vacuums are used at shooting ranges (lead dust and primer residue from cartridges), in ammunition manufacturing, for 3D printing with metal powders (aluminium and titanium are highly reactive when finely divided), in light-metal machining in aerospace and defense, and at process plants where pyrophoric powders such as zirconium and magnesium are handled. Some models are ACD-certified (IEC 60335-2-69 Annex AA) for non-ATEX-classified areas, others are ATEX-certified for Zone 20, 21 or 22 — but they all share the same neutralising liquid bath and the same uncompromising filtration.
INERT versus conventional HEPA filtration
A conventional HEPA vacuum retains particles in a filter but leaves them dry and potentially reactive. With reactive metallic dust that is not enough — the particle may react with oxygen (exothermic oxidation) or moisture (hydrolysis of certain metal hydrides) and disrupt the collection process itself. INERT technology solves this by inactivating the particle at the moment of collection: dust is immersed in the liquid before it can react, and the HEPA H14 filter then captures any residual aerosol before exhaust.
Questions and answers
What does INERT mean in this context?
INERT denotes a vacuum cleaner with a neutralising liquid bath in the collection tank. Dust is channelled directly into the liquid and inactivated immediately, so it cannot react with oxygen, heat or sparks. The technology is developed for reactive metallic dust (aluminium, titanium, magnesium, zirconium, lead dust from shooting ranges), where conventional dry collection would itself be an ignition source.
Is the INERT system tested to EN 17348:2022?
Yes. The entire Delfin INERT range is performance-tested to EN 17348:2022 -- the harmonized European standard for industrial vacuum cleaners in ATEX zones. The test confirms that the neutralisation bath actually inactivates reactive dust under real operating conditions, not just in a lab setup. Documentation available on request.
What types of dust is INERT technology intended for?
Reactive metallic dust: aluminium and aluminium alloys, titanium, magnesium, zirconium, fine iron powder, lead dust and primer residue from shooting ranges, and pyrophoric powders from aerospace and defense. For non-reactive dust (organic process dust, plastics, etc.) the INERT technology adds no further safety -- a standard ATEX or ACD model without liquid bath is selected instead.
How does the HEPA H14 final filter work together with the liquid bath?
The neutralisation bath inactivates dust at the moment of collection, but there will always be a fine aerosol fraction that passes the liquid surface. The HEPA H14 filter captures 99.995 % of particles down to 0.3 micrometres per EN 1822-5 (MPPS method) before exhaust. The combination secures both safe collection (no reactive dry particle) and clean exhaust (no health-hazardous aerosol). The filter is Included/Incluso as standard on all INERT models.
Why bypass on 1/3D and brushless on 1/2D?
ATEX category 3 (Zone 22) permits equipment with short-term spark risk if tb protection ensures the spark does not reach the classified volume. The bypass motor is faster, stronger and cheaper than brushless, and since Zone 22 is 'rare or short-term' (per ATEX definition), periodic operation with a bypass motor is appropriate. For category 2 (Zone 21), where explosive atmosphere is 'likely' or prolonged, the brushless motor without brushes is chosen -- fewer ignition sources and continuous operation. Thus: 1/3D = bypass (periodic), 1/2D = brushless (continuous).
How does the DM2 1/3D INERT compare to the MTL 451 1/2D INERT?
The DM2 1/3D INERT has almost three times the liquid capacity (37 L vs 10 L), larger tank (44 L vs 15 L) and 60 % more airflow (360 vs 215 m³/h), but rates down from 1/2D (Zone 21) to 1/3D (Zone 22) on the external category. Choose the DM2 1/3D INERT for high collection volume in Zone 22; choose the MTL 451 1/2D INERT for smaller tasks in Zone 21.