60 ERGO/Ex extraction arm Devices for pollution extraction ERGO EXTRACTION ARM HANGING VERSION Application The ERGO-L/Z-…Ex extraction arms are designed for capturing the dust and gases arising during technological processes, especially in areas of explosion risk, where explosive atmosphere can occur, as a mixture of fl ammable substances in form of dust or gases with the air. ERGO-L/Z-…Ex extraction arms are classifi ed as devices of group II, category 2, of gaseous risk G and dust risk D. The devices ensure high level of protection, therefore they can be applied in areas 1(G) or 21(D). Admissible temperature of the forwarded air is +70°C. Structure ERGO-L/Z/Ex extraction arms consist of following assemblies: – full-rotation swivel – stainless steel – circular hood – stainless steel – two pipe segments integrated by frictional joints – all elements are of stainless steel – frictional spacers made of textolite – gas springs of stainless steel – shut-off damper located in the pipe segment near above the hood – stainless steel – hose sections (joining the pipe segments) – made of polyurethane conducting electrical charges and a steel wire spiral. Superfi cial resistance <10ƒ¶. Elements of steel plate, pipes and stainless profi les are made of material 1.4301 according to PN- EN 10088, whereas screw materials, washers and rivets are of material A2 according to PN-EN ISO 7089. All constructional elements are joined together by copper cables to conduct the electrostatic charges to the grounding instal- lation. ERGO-L/Z/Ex extraction arms are manufactured according to ATEX 95 (94/9/WE) Directive and have Type Research Certifi cate No 254/CW/001/07 issued by Technical Supervision Offi ce in Poland. II 2 G /D

62 Flow resistance [Pa] Volume fl ow [m³/h] Type A [mm] B [mm] C [mm] D [mm] ERGO-L/Z-2-R/Ex 2110 1487 122 2213 ERGO-L/Z-3-R/Ex 2835 2092 409 3033 ERGO-L/Z-4-R/Ex 3374 2561 573 3643 Type A [mm] B [mm] C [mm] D [mm] ERGO-L/Z-2/Ex 1440 1650 800 2280 ERGO-L/Z-3/Ex 2195 2888 922 3100 ERGO-L/Z-4/Ex 2732 3372 1266 3710 FLOW CHARTS OF THE ERGO/Ex EXTRACTION ARMS WORK RANGES OF THE ERGO/Ex EXTRACTION ARMS ERGO-L 2 1 2 Position of the extraction arm resistance