ATEX Safety Switches. More than safety.

Transcription

1 ATEX Safety Switches More than safety. AUDIN - 8, avenue de la malle Saint Brice Courcelles Tel : Fax : Web : http: info@audin.fr

2 ATEX products from EUCHNER The ATEX directive Since July 003 all in the EU that is used in a potentially explosive atmosphere must comply with directive 9/9/EC. This directive is also known as ATEX00a Equipment for use in potentially explosive atmospheres ATEX for short. ZONE 0 ZONE As a result of harmonization, this directive replaces all former national regulations. Accordingly, the same, consistent rules for explosion protection apply in all EU states. Prerequisites for an explosion The following prerequisites are needed for an explosion to occur: A potentially explosive mixture of - Flammable material (gas, vapor, mist or dust) - Oxidizing agent (oxygen) A source of ignition (sparks, hot surfaces, etc.) Prevention of explosions The most effective way of preventing an explosion is to prevent the formation of a potentially explosive atmosphere. This type of explosion protection is called primary explosion protection. However, primary explosion protection is not always possible, for this reason the ignition of the potentially explosive atmosphere must be prevented. This measure is termed secondary explosion protection. In practice this form of protection is achieved by using explosion protected. This ensures that no hazard can be produced because of its operation in a potentially explosive atmosphere. Material groups The ATEX directive divides flammable materials into socalled material groups. A differentiation is made between the following material groups: G (gases, vapors and mists) D (dusts) Hazardous zones In accordance with EN the application areas for electrical are divided into hazardous zones. The hazardous zone defines the probability of the occurrence of a potentially explosive atmosphere. A differentiation is made between zones for flammable gases (zone 0, and ) and flammable dusts (zone 0, and ). The related zone must be defined by the machine or plant manufacturer. Most ATEX manufactured by EUCHNER is suitable for use in zone and zone. ZONE Example zone breakdown for a tank system Information on zone / Applications: Areas in the immediate vicinity around zone 0/0 or / Areas, e.g., around pipes in closed spaces If cable glands are used on for zone /, the glands must have special ATEX suitability. An appropriate cable gland is included with EUCHNER ATEX products. Equipment for zone / does not require a test certificate from a notified body. ATEX is tested by the manufacturer under the manufacturer s responsibility. However, most EUCHNER devices have been tested by TÜV on a voluntary basis. Equipment groups A further division into groups is made depending on the place a piece of is used. The following groups are used: Group I: Equipment for use in underground systems in mining Group II: Equipment for all other areas with potentially explosive atmospheres ATEX manufactured by EUCHNER belongs to group II. Explosion groups The likelihood of ignition depends on the material. For this reason gases and vapors are divided into explosion groups. The hazard produced by the gases increases from explosion group IIA to IIC. The requirements on the increase correspondingly. Electrical approved for IIC is also allowed to be used for the lower explosion groups (see table in this document). Categories The category describes the level of safety achieved by a piece of. Zone Category Potentially explosive General figures atmosphere is present (not standardized) Gases Dusts 0 0 continuous, long period >,000 hours per year or frequent occasional 0,000 hours per year 3 rare <0 hours per year

3 ATEX Overview of safety systems Electromechanical safety switches ATEX Accessories Connection Guard locking Environment Contact elements Approvals Features/specific advantages Slow-action switching elements Positively driven contacts NO contacts NC contacts Snap-action switching elements Positively driven contacts NO contacts Conventional thermal current Switching current min. (at V) Mechanical life, min. Housing material Housing dimensions min. (HxWxD) Ambient temperature Degreeofprotection,max. acc. to IEC 6059 Approach/actuating directions Approach speed, max. Solenoid operating voltage Power consumption Locking force, locked Cable entry ( cable gland ATEX included) Actuator straight/straight rubber-cushioned Hinged actuator Door radius, min. Bolt for safety guards NZ EX According to EN500, with impact resistant cover ma 30 x 0 6 Anodized die-cast alloy 97 x x 3.5 mm -0 to +80 C 50 m/min. 3 M0x.5 NZ.VZ EX Basic housing according to EN 500, with impact resistant cover ma x0 6 5 x x 3.5 mm -0 to +80 C 0 m/min. 3 M0x.5 / 65 mm GP EX Identical fixing dimensions to safety switches TP, with impact resistant cover ma x0 6 Reinforced thermoplastic 5 x 3 x 6 mm -0 to +80 C 0 m/min. 3 3xM0x.5 / 90 mm TP EX Auxiliary, key auxiliary, emergency or escape release, ideal for profile assembly, with impact resistant cover ma x0 6 9 x 3 x 6 mm -0 to +55 C 0 m/min. V 8W 300 N 3xM0x.5 / 90 mm Reinforced thermoplastic STP EX Marking according to - Application (gases/dusts) II 3 G D II 3 G D II 3 G D II 3 G D II 3 G D - Equipment characteristics (gases) Ex nc IIC T5 X Ex nc IIC T5 X Ex nc IIC T5 X Ex nc IIC T X Ex nc IIC T X - Equipment characteristics (dusts) Ex td A T90 C X Ex td A T90 C X Ex td A T90 C X Ex td A T0 C X Ex td A T0 C X Depending on actuator ) ) ) ) ) Anodized die-cast alloy Actuating head made of metal, high locking force, with impact resistant cover ma x0 6 Reinforced thermoplastic 90 x 3 x 6 mm -0 to +55 C 0 m/min. V 8W 500 N 3xM0x.5 / 300 mm Detailed information in catalog Safety Switches with Metal Housing Safety Switches with Plastic Housing Available as an option Available on request Not applicable All data given refer to the respective minimum and/or maximum values for the entire series. ) Approval pending

4 Marking of All used in potentially explosive atmospheres must carry appropriate markings: Marking according to application Marking according to ATEX II ( ) G Directive Corresponds to 9/9/EC Equipment group I: Mining II: All applications except mining Related electrical Equipment to which components for the stated application are connected. Material group Category Category Category 3 Very high level High level Normal level of protection of protection of protection Atmosphere G: Gases, D: Dusts G D G D G D Use in Zone 0 Zone 0 Zone Zone Zone Zone Overview of the Explosion groups and temperature classes T T T3 T I Methane II A Acetone Ethyl alcohol Petrol Acetaldehyde Ethane i-amyl acetate Diesel Ethyl ether Ethyl acetate n-butan Aircraft fuel Ammonia n-butyl alcohol Heating oils Benzol (pure) n-hexane Acetic acid Carbon monoxide Methane Methanol Propane Toluol II B Town gas Ethylene Coal gas II C Hydrogen Acetylene More than safety.

5 Marking according to characteristics Marking according to standard Gases Marking for use in atmosphere with flammable gases (zone 0,,) according to EN [ Ex nc IIA ] T X Explosion protected Related electrical Equipment to which components for the stated application are connected. Type of protection: i: Intrinsic safety q: Powder filling m: Encapsulation o: Oil immersion e: Increased safety d: Flameproof enclosure p: Pressurization n: Type n na: Non-sparking nc: Sparking nr: Restricted breathing enclosure nl: Energy limited circuit Equipment groups I: Mining II: All applications except mining (Sub-groups: IIA, IIB, IIC) Temperature X:Compliance with class: special conditions Permissible required (e.g. correct tightening of surface temperature the cover screws) Maximum surface temperature T=T a +T i T: Maximum surface temperature T a : Max. ambient temperature T i : Self-heating of the Dusts Marking for use in atmospheres with flammable dusts (zone 0,, ) according to EN 6-0 [Ex td A] T90 C X Explosionprotected Related electrical Equipment to which components for the stated application are connected. Type of protection: pd: Pressurization td: Protection by enclosure id: Intrinsic safety md:encapsulation Test method A or B Use in zone: 0 Maximum surface temperature T=T a +T i T: Maximum surface temperature T a : Max. ambient temperature T i : Self-heating of the X:Compliance with special conditions required (e.g. correct tightening of the cover screws)

6 ATEX Overview of safety systems Non-contact safety switches ATEX Approvals Safety Switch CES-A-C5 EX Evaluation unit CES-A-A EX Read head/actuator for evaluation unit CES-A-A EX Read head CEM-A-LE05K-S-EX Actuator CEM-A-BE05-EX Marking according to - Application (gases/dusts) II 3 G D II (3) G II 3 G II 3 G - Equipment characteristics (gases) Ex na IIC T5 [Ex nl] IIC Ex nl IIC T70 C Ex na IIC T6 - Equipment characteristics (dusts) Ex td A T90 C ) ) ) Features/specific advantages Actuator with unique code, integrated evaluation unit Actuator with unique code, separate evaluation unit Actuator with unique code, separate evaluation unit Actuator with unique code, separate evaluation unit Accessories Connection Guard locking Environment Inputs/outputs Read heads Relay safety outputs Semiconductor safety outputs Monitoring outputs (semiconductor) Monitoring/feedback loop connection Monitoring/start button connection Switching current per safety output Mechanical life, min. Evaluation unit Mounting Dimensions min. (HxWxD) Ambient temperature Degree of protection, max. acc. to IEC 6059 LED indicator Read head/actuator Ambient temperature Degree of protection, max. acc. to IEC 6059 Operating distance, max. Approach directions Solenoid operating voltage Power consumption, max. Locking force, max. Evaluation unit Read head cable/plug connector Actuator rectangular/cylindrical Bolt for safety guards 00 ma Integrated evaluation unit/read head Decentralized 7 x 0 x 0 mm -0 to +55 C Actuator -5 to +70 C /IP69K 0 mm Plug connector M / 6A (evaluation unit) 0 x 0 6 (evaluation unit) DIN rail x 99 x,5 mm -0 to +55 C IP 0 3 Plug-in terminals -5 to +50 C IP67/IP69K 6 mm M8 / -5 to +70 C mm V.5 W 500 N M8 Detailed information in catalog Non-Contact Safety Switches CES/CEM Available as an option Available on request Not applicable All data given refer to the respective minimum and/or maximum values for the entire series. ) Approval pending

7 Category Equipment in this category is intended for use in areas in which a potentially explosive atmosphere comprising gases or dusts is present continuously, for long periods or frequently. Requirements on the Very high level of safety, the remains protected against providing a source of ignition even in case of malfunctions to be expected only rarely The also remains safe if two independent failures occur Safety is achieved using two independent means of protection against providing a source of ignition Category Equipment in this category is intended for use in areas in which it is to be expected that a potentially explosive atmosphere comprising gases or dusts may occur occasionally. Requirements on the A high level of safety, the remains protected against providing a source of ignition even in the case of malfunctions or fault conditions to be expected frequently Safety is achieved using one means of protection against providing a source of ignition Category 3 Equipment in this category is intended for use in areas in which it is not to be expected that a potentially explosive atmosphere may occur due to gases or dusts. If a potentially explosive atmosphere nevertheless occurs, then in all probability it will only occur rarely and for a short period. Requirements on the Equipment with a normal level of safety The s remains protected against providing a source of ignition in normal operation ATEX manufactured by EUCHNER is category 3. Type of protection Electrical explosion-protected can be designed using various types of protection according to the standard EN and EN6-0. The type of protection used on a piece of by the manufacturer essentially depends on the nature and function of the piece of. There exist the following types of protection: EN6 EN60079 Dusts Gases Type of protection Marking Corresponding standard Flameproof enclosure Ex d EN Increased safety Ex e EN Intrinsic safety Ex i EN Encapsulation Ex m EN Type n protection Ex n EN Oil immersion Ex o EN Pressurization Ex p EN Powder filling Ex q EN Protection by enclosure Ex td EN 6- Pressurization Ex pd EN 6- Intrinsic safety Ex id EN 6- Encapsulation Ex md EN 6-8 ATEX manufactured by EUCHNER has type of protection n or td. This means that the is protected against providing a source of ignition for a surrounding potentially explosive atmosphere. This protection can be achieved using various technical principles. The principle used on a piece of can be determined from the marking. The following overview lists these principles: A Non-sparking Ex na Because of the design it is ensured the production of sparks and arcs is reliably prevented C Sparking with appropriate protection Ex nc (Hermetically sealed device / enclosed switching device) The contains contacts that open and close a circuit that could provide a source of ignition R Restricted breathing enclosure Ex nr L Energy limited Ex nl Temperature classes The temperature class is directly related to the ignition temperature (temperature from which a potentially explosive mixture will ignite) and defines the maximum surface temperature allowed on a piece of. The maximum surface temperature must always be less than the ignition temperature of the atmosphere in which it is used. On intended for use in zone 0,, (gases), the related temperature class must be given in the marking. On intended for use in zone 0,, (dusts), the maximum surface temperature must be given in the marking. Temperature classes Ignition temperature Maximum surface range of the mixtures temperature on the electrical T >50 C 50 C T >300 C 300 C T3 >00 C 00 C T >35 C 35 C T5 >00 C 00 C T6 >85 C 85 C

8 Item Mechanical safety switches Order no. Locking method Monitoring solenoid position ) Monitoring door position ) Suitable for zone G=gases/D=dusts Temperature class/ max. surface temperature NZHS-33-M-EX PD + NO G and D T5/90 C NZRS-33-M-EX PD + NO G and D T5/90 C NZVZ-3E-M-EX PD + NO G and D T5/90 C GP-3A-M-EX PD + NO G and D T5/90 C TP3-3A0M-EX Mechanical PD + NO NC G and D T/ 0 C TP-3A0M-EX Electrical PD + NO NC G and D T/ 0 C TP3-K0M-EX 095 Mechanical PD + NC NO G and D T/ 0 C STP3A-3A0M-EX Mechanical PD + NO NC G and D T/ 0 C STP3A-0M-EX Mechanical PD + NC NO G and D T/ 0 C STP-3A0M-EX Electrical PD + NO NC G and D T/0 C Non-contact safety switches ATEX products Evaluation units CES-A-C5H-0-EX S G and D T5/ 90 C CES-A-ABA-0B-EX S G Read heads CES-A-LNA-SC-EX G 70 C CES-A-LMN-SC-EX G 70 C CEM-A-LE05K-S-EX 0977 Electrical G T6 Actuators CES-A-BBA-EX G and D 70 C CES-A-BMB-EX G 70 C CES-A-BPA-EX 05 G and D 70 C CEM-A-BE05-EX G T6 Subject to technical modifications, no responsibility is accepted for the accuracy of this information. Techn. staus 0-/07 EUCHNER GmbH + Co. KG 0/008 # TA ) PD: positively driven contact, NC: normally closed contact, NO: normally open contact Further information is available from More than safety. AUDIN - 8, avenue de la malle Saint Brice Courcelles Tel : Fax : Web : http: info@audin.fr EUCHNER GmbH + Co. KG Kohlhammerstraße Leinfelden- Echterdingen Germany Tel. +9-(0) Fax +9-(0) info@euchner.de