Delfin ZFR EV AP 560 K1 Z22

The K1 (1.1 kW, 1,500 m³/h) is the optimal choice when the load is moderate -- typically one or two extraction arms on shorter piping, a single CNC machine, or a smaller cyclone installation. If you plan three or more simultaneous collection points, or if the extraction arm is more than 5-6 metres from the deduster, the K2 (2.2 kW, 2,500 m³/h) is the more robust choice. The K4 (4 kW, 3,500 m³/h) is reserved for central suction systems with four or more points, or for scenarios where the particle is particularly sticky or heavy. Operating economy should weigh in: the K1 draws less current and is quieter in operation -- do not choose a K4 if a K1 suffices.

ANT is the Italian abbreviation for 'antistatico' -- antistatic. The filter medium is deliberately made electrically conductive (typically via graphite additives or metal fibres in the polyester weave) to ensure that the static charge built up as particles brush past the filter can be conducted away to earth. On an antistatic filter in a Zone 22 area this is an ATEX-critical function: a non-antistatic filter could accumulate several kV of static potential and generate a spark that ignites the collected dust. Filter class M (medium) indicates that the filter retains dust with MAK values down to 0.1 mg/m³ -- moderately strict for dust types one would not want to inhale, but not in the carcinogenic category.

It is a consequence of the centrifugal fan's characteristic. When stepping up to a larger rotor and larger inlet diameter (560 mm vs 420 mm), the fan shifts toward higher airflow at lower static vacuum -- a so-called movement along the fan curve. The K1 variant delivers 50 % more airflow (1,500 vs 1,000 m³/h) but 11 % lower static vacuum (160 vs 180 mmH²O). For a deduster with short piping and low-resistance filtration this is a good trade -- volume flow takes over from point vacuum. For applications with long hoses or clogged filters the 420 model will maintain suction-point vacuum better. So: choose by the pressure profile of the installation, not by peak figures.

With 100 L capacity, and depending on dust density, there is typically 1-3 operating shifts between emptyings. For light wood dust (density ca. 0.3-0.4 t/m³) 100 L corresponds to roughly 30-40 kg -- at 5 kg/h collection the container lasts ca. 6-8 hours. For heavier metal dust (density 2.5-7 t/m³) the container lasts much longer in volume, but weight can become a handling problem -- roll the container out on wheels before it is filled to the rim. The plastic liner is folded over the container rim to prevent dust on the outer edge, and is pulled in from above when the container is emptied. AISI 304 inox container is available as option for greater chemical resistance.

In Zone 22 the entire suction system -- the deduster, the extraction arm, all metallic piping and even the hoses -- must be electrically connected and earthed to the same potential. Maximum resistance to earth is typically specified at 10⁸ ohm in ATEX practice. Delfin's TA arm configurations are supplied with earth grounding (MT) integrated as standard -- a metallic threaded coupling connection between the arm joints and the deduster chassis. When the arm and deduster are installed, the installer must measure the resistance between the arm tip and earth potential to verify continuity. Antistatic hoses must also be series-earthed via metallic end clamps.

Yes, and it is a good idea when collecting heavy or coarse particles (foundry chips, sandblasting residue, coarser plastic chips). A cyclone installed before the deduster typically retains 70-90 % of heavy particles in its own container, which extends the primary filter's life significantly and keeps the container less filled with 'empty volume'. With the K1 model's 200 mm suction inlet a standard ATEX-approved cyclone (oe200 inlet) can be connected directly. Important: the cyclone and the deduster must be at the same ATEX zone level (both Zone 22), and earth grounding must be carried through the entire system including the cyclone wall.