Depureco PUMA 30 P DEX 1/2D

Because PUMA HD uses an enclosed cartridge chamber with a hermetic pulse-valve manifold inside the vessel itself. When reverse jet cleaning activates, the pulse energy is confined to the *inside* of the filter and is immediately sealed by active differential-pressure valves. There is no air exchange between the pulse chamber and the machine's outer chassis. PUMA DEX SP on the other hand uses a star filter with external pulse manifolds -- pulse energy can briefly release a small overpressure through ventilation slots, which Depureco documents as a short-duration Dc reduction on the outside. The design difference lets PUMA HD retain Db classification even during pulses, while PUMA SP is necessarily Dc.

The PUMA 30 P DEX 1/2D delivers 170 mbar / 1940 m3/h while the 1/3D sibling delivers 200 mbar / 1985 m3/h. The reason is the mandatory H14 absolute filter included on the 1/2D version -- the H14 element introduces extra back-pressure on the discharge side. Depureco have therefore calibrated the side-channel motor to a slightly lower terminal vacuum to preserve the same acoustic profile (78 dB(A)) and keep motor temperature within the T140°C limit. Practically this makes no difference to dust collection efficiency -- only in very specific scenarios with long (>50 m) hose runs and very fine dust will the 30 mbar be noticeable.

The motor sits in an ATEX enclosure outside the dust vessel, with independent cooling and a TUEV-certified electrical panel. The panel contains a motor protection relay (thermal + overcurrent), phase-sequence detector (3-phase direction safeguard), earth-fault relay and close-down temperature watchdog at 135°C (below the T140 limit). Remote control operates start/stop + jet-cleaning sequence from the operator position up to 20 m away. Panel and motor are both IP65 -- can be installed near process water systems. If any parameter is exceeded, the entire unit stops automatically with a potential-free fault output to an upper-level plant PLC.

The H14 absolute filter 110,000 cm2 is specifically sized for the PUMA HD's 1940 m3/h flow at nominal conditions. Filter capture efficiency is >=99.995% at 0.3 micron (MPPS test). It is the third filtration stage after the cartridge (polyester M class, 180,000 cm2) and before discharge. Differential pressure trigger at 25 mbar warns when H14 needs replacement; service interval is typically 2000-4000 operating hours depending on dust particle size distribution. Replacement requires bag-in/bag-out procedure due to potential Zone 21 contamination of the used filter.

Yes, up to 140°C dust inlet temperature, with an approximate 40 K cooldown through 5-6 metres of primary intake piping (cold-world velocity). For dust hotter than 140°C you must select Depureco's Flex-Cooler pre-separator or aquamatic drop-separator with integrated water injection. Contact us for thermal dimensioning if you have flue-gas vessel extraction or heat-treatment furnaces connected. The PUMA HD's cartridge filter is silicone-coated antistatic polyester, which gives better heat resistance than standard PES -- but the T140 limit is binding and must be observed.

Footprint 1050 x 1950 mm, height 2300 mm, service area minimum 1 m on all four sides (dust container rolls out from the front, filter change requires top access). Placed on concrete floor with min 500 kg/m2 bearing capacity; alternatively reinforced steel platform. Power supply 400 V / 50-60 Hz with 63 A fuse; compressed air 6-8 bar clean and dry (200-400 L/min). Equipotential bonding per IEC 60079-14 -- all metal must be earthed. The supervising safety engineer should obtain ATEX zone drawings and the explosion protection document before installation. We supply foundation drawings and ATEX integration memo on request.