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Enquiry form - ATEX operating conditionsCustomer data

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Specifications

Drive      

Power takeoff (PTO)      

Output      

Operating speed      

Rated torque      

Type of application      Operating temperature      

Please enter the required protection class here:

            c            

1: ATEX sign 2: Device group 3: Category 4: Ignition protection type 5: Explosion group 6: Temperature class

Example:

II 2G c IIB T61: ATEX sign 2: Device group 3: Category 4: Ignition protection

type 5: Explosion group 6: Temperature class

The following pages contain information on determining the required protection class!

Explanations ATEX operating conditions

Determining the device group

Device Group I:

Equipment used in underground mines and their above-ground facilities.

Subgroup M1: Subgroup M2:Very high level of safety:It must be possible to operate the devices in the presence of an explosive atmosphere.CENTA couplings cannot be dimensioned for the Device Group M1.

High level of safety:These devices may be switched off when an explosive atmosphere develops.

Device Group II:

Equipment used in other areas that may be endangered by an explosive atmosphere.

Subgroup D: Subgroup G:Devices for areas where dust can form explosive atmospheres.

Devices for areas in which explosive gas, vapour, mist, and air mixtures exist.

By default, CENTA couplings fall under Device Groups I (M2) or II (D/G).

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Explanations ATEX operating conditions

Determine categoryStep 1: Division in zones Initially, potentially explosive areas must be divided into zones according to the frequency and duration of the occurrence of hazardous explosive atmospheres: Potentially explosive atmosphere by

Zone In normal operation, the explosive atmosphere exists ...

Comment

Gases,vapours,mists

0 ... constantly and over long periods of time or frequently.

CENTA couplings cannot be used

1 ... occasionally.2 ... rarely and briefly.

Dusts 20 ... constantly and over long periods of time or frequently.

CENTA couplings cannot be used

21 ... occasionally.22 ... rarely and briefly.

Step 2: Determining the device categoryNext, ensure the devices and equipment to be used may be used in the respective zone.

The device category indicates in which zone a device may be used. The device subcategories “D” and “G” (see above) have been further subdivided for this purpose:Device category

Explosion hazard from

Can be used in zone(s)

The potentially explosive atmosphere exists

Level of safety

Comment

1D Dust 0, 1, 2... constantly and over long periods of time or frequently.

very high not possible

2D Dust 1, 2 ... occasionally. high

3D Dust 2 ... rarely and briefly. normalonly non-conductive dust

1G Gas 20, 21, 22... constantly and over long periods of time or frequently.

very high not possible

2G Gas 21, 22 ... occasionally. high3G Gas 22 ... rarely and briefly. normalM1 Mining -- very high not

possibleM2 Mining -- high

CENTA couplings may only be used in Zones 1 and 21 as well as 2 and 22 and thus comply with the device categories 2D / 3D (3D only for non-conductive dust, 2D includes 3D), 2G / 3G (2G includes 3G) and M2.

Specified type of protection “Constructive Safety (c)”Page 3 of 5

Explanations ATEX operating conditions

Type of protection = the manner in which ignition sources are preventedCENTA couplings are supplied exclusively with the type of protection “Constructive Safety (c)”.

Determining the explosion groupGases: European Explosion Groups IIA, IIB and IICVarious explosive atmospheres are subdivided into different explosion groups depending on their ignitability and their ability to spark ignitions. The dangerous nature of gases increases from Explosion Group IIA to IIC!

Typical gases Formula

Minimum ignition energy [mJ]

Explosion group

Methane CH4 0.280 IIAPropane C3H8 0.250 IIA

Ethylene (ethene) C2H4 0.082 IIBHydrogen H2 0.016 IIC

Acetylene (ethyne) C2H2 0.019 IICCarbon disulfide CS2 0.009 IIC

Dust: no explosion groups, specify minimum ignition energy!

Mining: Not grouped, provided only methane exists in combination with pulverized coal. The gas groups apply if another gas exists.

By default, CENTA couplings are approved for IIA and IIB. They are also approved for IIC provided the explosive environment consists of mixed hydrogen gases. Other environments on request and after verifying the environment’s compatibility for the elastic element used. Carbon disulphide environments are not possible.IIC includes IIB. IIB includes IIA.

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Explanations ATEX operating conditions

Determining the temperature class

Devices and equipment may only be operated in an explosive atmosphere if their maximum surface temperature remains below the ignition temperature of the explosive mixture!

The ignition temperature of a gas or fluid is the lowest temperature of a heated surface at which the ignition still occurs.

Temperature classPermissible surface temperature [°C]

Ignition temperature range of the combustible substances

[C]T1 450 >450T2 300 300 - 450T3 200 200 - 300T4 135 135 - 200T5 100 100 - 135T6 85 85 - 100

CENTA couplings may be used in the various temperature ranges as follows:T1/T2/T3 -40 °C to +80 °C ambient temperatureT4: -40 °C to +78 °C ambient temperatureT5: -40 °C to +50 °C ambient temperatureT6: -40 °C to +38 °C ambient temperature

Exceptions:CENTAFLEX-A: T5 to 59 °C; T6 to 47 °CRubber elements: T5 to 43 °C; T6 to 31 °C

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