Over the past few years, the national and international regulatory authorities have laid down a series of regulations for the control of substances that are harmful to man or the environment and for the environment safety management in the industrial field.
European Directive 2002/95/CE RoHS (Restriction of Hazardous Substances) applicable to the fi eld of electrical and electronic equipment. This provides for a gradual reduction in the heavy metals (Pb, Cd, Hg, and Cr6) and halogens (PBB and PBDE) present in the components used in the electrical and electronic industries. In the data sheet of each product the “RoHS compliance” is indicated by the green symbol.
The presence of this symbol means that all the technical problems related to the materials used for the chosen product have been solved out in compliance with the European irective 2002/95/CE.
In practice, it could happen that the stock rotation process has not been completed yet: anyway, on elesa website www.elesa.com it is possible to make a check.
ELESA Technical Department is always at the customer’s disposal for any kind of assistance.
European Regulation n.1907/2006 - REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) applicable to all the chemical substances circulating in the European Community, aiming at improving the knowledge of the dangers and risks arising from the existing chemical substances and from the new ones.
European Directive 2000/53/CE - ELV (End Life of Vehicles) applicable to the automotive fi eld. This provides for a gradual reduction in the heavy metals Pb, Cd, Hg, and Cr6, resent in vehicles.
RAEE (WEEE) Directive - Waste of Electrical and Electronic Equipment..
ATEX Directive 94/9/CE - ATEX effective since the 1st of July 2003, refers to work environments with explosion risks and classifi es the zones where a potentially explosive atmosphere may occur. ATEX marking (together with the declaration of conformity) certifi es that the item, on which it is applied, was manufactured in compliance with all the requirements and provisions of the European Union Directive 94/9/EC (mandatory since 1st of July 2003) and that it was submitted to the procedures for conformity assessment. In accordance with this directive, certifi cation is compulsory for all the equipment and protection systems, for the components (which are necessary for operating in safe conditions) that will be used in potentially explosive atmospheres (either pneumatic, hydraulic, electrical, mechanical) and for all safety, control and adjustment devices needed for the safe operation of the equipment and the protection systems, installed out of the potentially explosive atmosphere, but having the function of protection against explosion risks.
Hazardous zones (are classified according to the frequency and duration of the occurrence of a potentially explosive atmosphere):
zone 0 area in which a potentially explosive atmosphere, consisting of a mixture of air and fl ammable substances in the form of gas, vapour or mist, is present always, for long periods or often (at least 1000 hours/year);
zone 1 area in which, during normal operations*, a potentially explosive atmosphere, consisting of a mixture of air and fl ammable substances in the form of gas, vapour or mist, is occasionally present or with a small frequency (more than 10 hours and less than 1000 hours/year);
zone 2 area in which, during normal operations*, a potentially explosive atmosphere, consisting of a mixture of air and fl ammable substances in the form of gas, vapour or mist, is present only for a short time or seldom (less than 10 hours/year);
zone 20 area in which a potentially explosive atmosphere in the form of a cloud of combustible dust in air is present always, often or for long periods (at least 1000 hours per year);
zone 21 area in which, during normal operations*, a potentially explosive atmosphere, in the form of a cloud of combustible dust in air is occasionally present or with a small frequency (more than 10 hours and less than 1000 hours/year);
zone 22 area in which, during normal operations*, a potentially explosive atmosphere, in the form of a cloud of combustible dust in air is present only for a short time or seldom (less than 10 hours/year).
* normal operations means the situation in which installations are used within their design parameters.
The directive identifies two groups of equipment (I and II), in accordance with the environment in which it is used:
group I comprises equipment intended for use in the underground parts of mines, and/or in the surface parts of such mines;
group II comprises equipment intended for use in environments other than those specified for group I.
Within group II, the devices subject to the provisions of ATEX directive are subdivided into categories according to the combination of explosion hazard zones and equipment groups:
category 1 comprises equipment and protection systems in this category are intended for use in areas in which explosive atmospheres are present for long periods or often (1000 hours or more/year), ensuring a very high level of protection;
category 2 comprises equipment and protection systems in this category are intended for use in areas in which, during normal operations, explosive atmospheres are present, with a small frequency or occasionally (10-1000 hours/year), ensuring a high level of protection;
category 3 comprises equipment and protection systems in this category are intended for use in areas in which, during normal operations, explosive atmospheres are present only for a short period or seldom (less than 10 hours/year), ensuring a normal level of protection.
The directive also specifies the Groups of substances, classifying the substances that create potentially explosive atmospheres with air based on their hazardousness. The hazardousness depends on the gas ignition temperature.
The table below shows some examples of gases with their related classification.
Equipment with IIB marking are suitable also for applications that require equipment of explosion group IIA, those marked with IIC are suitable also for applications that require equipment of explosion groups IIA and IIB. The table below shows the temperature classes, that indicate the max surface temperature (detected on the surface of the piece into contact with air), that must not be exceeded, to prevent ignition.
Elesa products are components necessary for the safe operating of equipment and protection systems included in Group II (environments other than mines).
The following table shows the related categories:
k’ protection factor: most of Elesa products included in the line of accessories for hydraulic systems are also certified according to EN 13463-8 standard (Protection by liquid immersion ‘k’): the equipment protection is based on the presence of a liquid that prevents the formation of sparks and other causes of ignition.
The following example shows the ATEX classification of a certified Elesa product, e.g. a plug of the TN series, according to EN13463-8 standard, in which “k” is evidently present:
In an industrial environment, i.e. where ATEX Group II products are used, it is the user's responsibility to classify the zones in relation to the “potential” presence of gases, vapours and explosive dusts, identifying the relevant work places and working activities where explosion risks are present or could trigger, according to his/her risks assessment.
The manufacturer provides all the necessary information related to the Groups and Categories of the product, in order to allow the user to decide in which zone the ATEX product can safely operate, even if he/she is not able to foresee where and how it will actually operate.