kruger centrifugal fan selection software

When installing 2G fans in zone 2 or in non-potentially explosive atmospheres, or 3G fans in non-potentially explosive atmospheres, it should be taken into account that the fans are not gas-tight. Rosenberg ex-fans are suitable for the ventilation of explosive atmospheres in zones 1 and 2 as well as for installation in zones 1 and 2. For combustible gases, vapours and mists, the following applies: Zone 0 For areas where danger of an explosive atmosphere exists long-term (continuously) or frequently Zone 1 For areas where danger of an explosive atmosphere exists during normal operation Zone 2 For areas where danger of an explosive atmosphere seldom exists or only for short-term periods ZonesĪs a basis for determining the extent of requirements to be imposed, explosive areas are classified into zones according to the likelihood of a dangerous, explosive atmosphere or combustible dust. They only can be used as category 3 (Zone 2) devices. The ignition protection category Increased Safety 'eb' shows that increased safety measures are taken to prevent the possibility of inadmissibly high temperatures and the occurrence of sparks or electric arcs in the interior or on external components of electrical appliances which do not occur during normal operation.Įlectrical equipment of ignition protection category 'ec' is not able to ignite a surrounding potentially explosive atmosphere.

These ignition protection categories are valid for electrical appliances in potentially explosive rooms and units, where gases or vapours can form or accumulate and produce explosive mixtures in combination with air. For Zone 1 this would be „eb“ and for Zone 2 „ec“.

Rosenberg external rotor motors are in accordance with type of protection Increased Safety „e“. The individual ignition protection categories are detailed in separate standards, such as: Ignition protection categoriesĮquipment protection by flameproof enclosures 'd'Įquipment protection by pressurized enclosure 'e'Ĭlassification of areas - Explosive gas atmospheresĮquipment protection by intrinsic safety 'i'Ĭonstruction, testing and marking for Group II electrical equipment with type of protection 'n' IdentificationĪs a result of the assessment of ignition risks, the fans will be marked as follows: II 3G c IIB T3 (X) / II 2 G c IIB T3 (X) » ClassificationsĮxplosion proof operating equipment for potentially explosive areas is classified in the European Standard EN 60079-X. In this case, the information on the motor differs from that on the fan in the voltage, current, power, speed and tipping time data. In order to realise a favourable speed ratio for voltage-controlled fans with external rotor motors, motors may possibly be used which have a higher rated voltage than the fan voltage. Refer to the fan nameplate for the nominal fan data. The motor data for an optimally cooled motor are stamped onto the type nameplate and are part of the contents of the EC type examination certificate for zone 1 motors. The guards must at least meet the requirements of EN 13857. The inlet and outlet of the fan can be fitted with guards, if required, to prevent the dropping or sucking in of foreign particles. The possible contact surfaces between rotating and stationary components, in view of operating malfunctions which are typically to be expected, are manufactured using materials with a minimised ignition risk resulting from friction, grinding or impact sparks. Rosenberg fans for potentially explosive atmospheres are manufactured and tested in accordance with the state of technical knowledge.

Kruger centrifugal fan selection software