Delfin MTL 451 1/2D
- Mid-sized production areas in Zone 21 with regular dust generation
- Pharmaceutical or chemical production with longer running times
- Cleaning around cyclones and filter units in Zone 21
- Bag-filling stations where direct container emptying is acceptable
- Process-adjacent dust collection with higher capacity requirements
- ATEX Directive 2014/34/EU -- II 1/2D Ex h tb IIIC T80°C(Int)/T95°C(ext) Da/Db
- EN 17348:2022 (harmonized March 2023)
- IEC 60335-2-69 (industrial vacuums)
Delfin MTL 451 1/2D
The MTL 451 1/2D is the mid-size ATEX sibling to the MTL 452 ACD, certified for Zone 21 with internal Zone 20. The model features a 45-litre container, a single-phase brushless motor at 115/230 V, and a large star/pocket filter (20,000 cm²) with manual cleaning. The brushless motor with no carbon brushes handles extended running times, and the stricter ATEX class Da/Db makes the model suited to process-adjacent cleaning in pharmaceutical or chemical production.
Applications
- Mid-sized production areas in Zone 21 with regular dust generation
- Pharmaceutical or chemical production with longer running times
- Cleaning around cyclones and filter units in Zone 21
- Bag-filling stations where direct container emptying is acceptable
- Process-adjacent dust collection with higher capacity requirements
Technical specifications
| ATEX marking | II 1/2D Ex h tb IIIC T80°C(Int)/T95°C(ext) Da/Db |
|---|---|
| Internal / external zone | 20 / 21 |
| Motor type | 1 brushless-motor (1,1 kW) |
| Duty cycle | Periodic |
| Airflow | 215 m³/h |
| Vacuum | 221 mbar (2250 mmH₂O) |
| Container | 45 L |
| Sound pressure | 74 dB(A) |
| Filter class | H class |
| Filter type | HEPA H14 (EN 1822), 99,995 % MPPS, 20.600 cm² |
| Primary filter | Stjerne/taskefilter polyester ANT M-klasse antistatisk, 20.000 cm², Ø 420 mm -- manuel rystning |
| Collection system | Plastic bag |
| Material | AISI 304 (inox) |
| IP class | IP64 |
| Power | 1.1 kW |
| Current | 8 A |
| Voltage | 115/230 V / 50-60 Hz |
| Inlet | Ø 80 mm |
| Dimensions (L × W × H) | 550 x 690 x 1470 mm |
| Weight | 57 kg |
Questions and answers
What is the difference between the MTL 451 1/2D and MTL 452 ACD?
The MTL 451 1/2D is ATEX-certified for Zone 21 (II 1/2D, EPL Da/Db) with one brushless motor at 1.1 kW and 215 m³/h airflow. The MTL 452 ACD is ACD-certified (non-ATEX) with two bypass motors at 2.2 kW and 360 m³/h. Choose 451 1/2D if the area is classified as Zone 21 or stricter; choose 452 ACD if the area is not ATEX-classified but the dust is combustible.
Why a star/pocket filter?
The star/pocket filter has a larger total filter area than a cartridge filter and a lower air load per filter area (108 m³/m²/h). It suits tasks with large dust volumes over longer periods. Cleaning is done manually by shaking the filter -- robust and simple without compressed air.
What does the marking II 1/2D mean?
"II" means surface installation, "1" indicates the internal category (Zone 20), "2" indicates the external category (Zone 21 -- explosive dust atmosphere likely during normal operation), and "D" stands for dust. EPL Da/Db confirms high protection both internally and externally.
Can it be used in Zone 22?
Yes. A 1/2D-marked vacuum may also be used in Zone 22, as 1/2D is the stricter class. The reverse does not apply: a 1/3D must NOT be used in Zone 21.
What filter class does it have?
Filter class H with an absolute HEPA H14 filter per EN 1822 (99.995 % MPPS), 20,600 cm². The primary filter is a polyester ANT M-class antistatic star/pocket filter of 20,000 cm² (Ø 420 mm) with manual shaking.
Does it comply with EN 17348:2022?
Yes. The MTL 451 1/2D meets EN 17348:2022, the harmonized standard for industrial vacuums handling combustible dust in ATEX-classified environments.