Tiger-Vac EXP1-20 DT (PRS-HEC) RE HEPA

PRS-HEC stands for Pre-Separator with High Efficiency Cyclone -- a centrifugal pre-separator fitted ahead of the main filter. Dust enters the cyclone chamber tangentially and is forced into a downward spiral. Heavy particles are thrown against the container wall and fall into the detachable tank, while cleaned air passes to the HEPA filter and exhaust. More than 90 % of incoming dust is collected in the tank without reaching the filter. The benefit is threefold: significantly longer HEPA service life (less frequent filter changes), lower operating cost, and much better performance with coarser dust -- e.g. metal chips, mineral powder or wood dust. On a standard vacuum without pre-separator the HEPA filter would clog quickly and vacuum drop.

II 2GD means the unit is ATEX category 2 both for gas (G) and dust (D) externally. Specifically, the EXP1-20 DT (PRS-HEC) RE HEPA may be placed in Zone 1 (where explosive gas atmospheres are likely to occur under normal operation) and in Zone 21 (where explosive dust atmospheres are likely to occur under normal operation). It does NOT carry internal Zone 0/20 certification -- i.e. the interior of the vacuum is not intended to contain explosive atmospheres for extended periods. For internal Zone 20 use choose a II 1/2GD rated model such as CD-230V EX MRPFT HEPA or the CD-36L EX DT MRP/MFS 1/2GD variants.

Choose the PRS-HEC version if you mostly collect coarse or medium-coarse dust (above about 20 microns) in larger quantities -- e.g. metal grinding, wood processing, mineral powder, granulates. The cyclone reduces load on the HEPA filter so service intervals shift from days to weeks, extending real service times significantly. For very fine dust (below 5 microns, e.g. toner or alumina) the PRS-HEC cyclone offers less benefit because the finest particles follow the air stream and still reach the HEPA -- here the standard EXP1-20 without pre-separator is usually more economical since it is lighter and cheaper. Neither variant is suitable for liquid recovery -- choose a wet/dry model such as EXP1-40L FR-P WET/DRY.

The 25 L detachable tank (DT) can be lifted off the carriage after suction is shut down and pressure has equalised. The procedure: switch off, wait 30-60 seconds until valves are back in equilibrium, release the clamps securing the tank to the filter head, and wheel the tank out on its own casters. The tank can then be rolled to a waste bin or sealing bag. An extra recovery tank (part 223001-ASM1) can be added so an empty can be swapped for a full without downtime -- useful in continuous production. Note: for toxic or active pharmaceutical dust, a static-dissipative conductive poly-liner bag must be used and sealed before disposal (available separately from Tiger-Vac).

SD stands for Static Dissipative. The accessories (suction hose, wands, floor tools, brushes) are made with conductive materials or additives so electrical charges cannot build up during vacuuming and therefore cannot trigger sparks in an ATEX environment. Resistance is typically below 10^6 Ohm measured to EN 60079-32-2. The entire accessory chain from hose end to vacuum earth must be conductive to maintain ATEX safety -- so the SD accessory set forms an integrated system and must not be mixed with standard (non-SD) accessories. The multimeter (211065B) supplied with the machine can be used to verify the discharge path is intact before each shift.

No. The EXP1-20 DT (PRS-HEC) RE HEPA is a dry-only collector -- EN 17348 DT. For wet/dry in the same II 2GD class choose the EXP1-40L FR-P WET/DRY, which is II 2GD and accepts both dust and non-flammable liquids. If the liquid is flammable a specially inertised machine is required -- contact us for advice.