Delfin DG 30 EXP EX1/2D

The difference is motor power and airflow. The DG 30 EXP delivers 420 m³/h at 4.0 kW, while the DG 70 EXP delivers 560 m³/h at 5.5 kW. Cabinet, tank and primary filter are identical (60 x 103 x 170 cm, 100 L, 30,000 cm² primary). Choose the DG 30 EXP for moderate airflow in continuous dust collection at installations with current limits or where running cost matters. Choose the DG 70 EXP where you need larger suction openings, longer hose runs or higher dust loads -- it also has twice the HEPA filter area (52,000 cm² vs 26,000 cm²), giving longer filter life under heavy load.

A notified body is a technical test house designated by EU member states to perform conformity assessment under the ATEX Directive 2014/34/EU. Notified bodies have a 4-digit identification number and are listed in the European Commission's NANDO database. For ATEX vacuum cleaners, European manufacturers typically use Eurofins (NB 0477 or similar), CESI (NB 0722), DEKRA (NB 0158) or InterTek (NB 0359). Delfin states the specific notified-body number on the EU type-examination certificate supplied with each machine in the technical file. The certificate number is central to compliance audit and should be archived with the ATEX explosion-protection document.

The side-channel blower in the DG 30 EXP is larger and runs at higher speed to deliver 420 m³/h versus the MTL 3533's 320 m³/h. Noise level in industrial vacuums is practically always correlated with airflow and motor power, because turbulent airflow from the blower wheel dominates the acoustic signature under continuous duty. The 72 dB(A) figure is measured per EN ISO 3744 at 1 m distance without suction accessories; with hose and tool the level typically falls 2-4 dB(A). Even under 8 hours of continuous duty the DG 30 EXP is well below the Danish Working Environment Act action limit of 85 dB(A) LEX,8h, so hearing protection is not mandatory at the machine alone. Ambient noise in the production, however, can raise the total level -- a noise survey must always be performed as part of the workplace risk assessment.

EN 17348:2022 is the European harmonised standard for "Industrial vacuum cleaners and dust collectors for use in explosive atmospheres". It was harmonised in March 2023 under the ATEX Directive and in August 2024 under the Machinery Regulation 2023/1230. The standard consolidates requirements for construction, testing, documentation and marking of vacuum cleaners for explosive dust atmospheres (Zone 20/21/22) and replaces the older EN 60335-2-69 requirements for ATEX applications. The practical effect is that a machine like the DG 30 EXP EX1/2D with direct compliance to EN 17348 provides a "presumption of conformity" with the essential health and safety requirements of ATEX 2014/34/EU -- which significantly simplifies commissioning and documentation. Third-party certification by a notified body is a requirement in EN 17348's normative part for internal Zone 20 equipment.

Yes, but three technical conditions must be considered. (1) The pressure drop in the existing piping must not exceed what the DG 30 EXP can compensate (approx. 2400 mmH²O upper limit). For long pipe or bend runs, a calculation with Delfin Denmark or the distributor's application department is recommended. (2) The pipe inner diameter must match the machine's suction opening (Ø 80 mm) to maintain transport air velocity above 20 m/s -- below that, dust will settle in the pipe. (3) The entire piping system including bends, dampers and endpoints must be ATEX-certified to at least the same level (1/2D for Zone 21) and have documented third-party certification for components in the explosive zone. An unassessed pipe section is a frequent ATEX compliance challenge and must be addressed in an installation-level explosion-protection document.

There is no fixed replacement interval -- HEPA H14 filter life depends on dust load, particle size distribution and whether the primary filter (star/pocket) is cleaned on time. In practice the filter condition is monitored via differential pressure: a new HEPA filter typically gives 50-80 mbar pressure drop at 420 m³/h, and replacement is required at 200-250 mbar. Measurement requires a U-tube manometer or electronic pressure gauge fitted across the filter. Delfin offers differential-pressure monitoring as an option. Under continuous operation in pharmaceutical production with fine API powders it is typically 12-18 months; with lighter dust load in e.g. packaging lines 24-36 months. Life is extended by regular cleaning of the primary filter -- unfiltered dust is the variable you control yourself.

Delfin supplies a complete ATEX technical file: (1) EU Declaration of Conformity (DoC) per ATEX 2014/34/EU and the Machinery Regulation 2023/1230, (2) EU type-examination certificate from the notified body that issued the certification (with 4-digit NB number), (3) ATEX rating plate on the machine with complete marking II 1/2D Ex h IIIC T160°C Da/Db + serial number + year of manufacture, (4) operating and maintenance manual in at least English and Danish, (5) quality assurance documentation for the production process (ISO 9001 and module D/E per ATEX), and (6) test report for earth-bonding verification. Documents should be archived with your ATEX explosion-protection document and be available for inspection by the Danish Working Environment Authority. In case of loss, Delfin Italy or the distributor can issue a copy based on serial number.