ABB 266 DDS, Manual

Page: 53 / 60

Application with Gas
Application with Dust
Zone “0” Zone “1”
Dangerous
medium
(process)
Tank
Zone “0” / Zone “1”
separation element
Primary
transducer
266 Tx
Category
1/2 G Ex ia Ga
Zone “20”
Dangerous
medium
(process)
Silo
Zone “21”
266 Tx
Category
1/2 D Ex ia Da
2 6 6 DDS H A RT |
P R E SSU R E T R A N SM I T T ER S | O I/ 2 6 6 D DS - EN R E V. B 53
Hazardous atmospheres
Ex Safety aspects and IP Protection (Europe)
According to ATEX Directive (European Directive 2014/34/EU and relative European Standards which can assure compliance with
Essential Safety Requirements, i.e., EN 60079-0 (General requirements) EN 60079-1 (Flameproof enclosures “d”), EN 60079-11
(Equipment protection by intrinsic safety “i”), the 2600T SERIES pressure transmitters have been certified for the following group,
categories, media of dangerous atmosphere, temperature classes, types of protection. Examples of application are also shown
below by simple sketches.
a) Certificate ATEX II 1/2 G Ex ia IIC T4/T5/T6 Ga/Gb and II 1/2 D Ex ia IIIC T85°C Da
FM Approvals Certificate number FM09ATEX0024X (Tremezzina, Warminster, Bangalore Shanghai and Dammam products)
This ATEX Category depends both on the application (see below) and on the intrinsic safety level of the transmitter supply (associated
apparatus) which can sometimes suitably be [ib] instead of [ia]. As known, the level of an intrinsic safety system is determined by the
lowest level of the various devices used, i.e., in the case of [ib] supply, the system takes over this level of protection.
The meaning of ATEX code is as follows:
– II: Group for surface areas (not mines)
– 1/2: Category - It means that only a part of the transmitter complies with category 1 and a second part complies with category 2
(see next application sketch).
– G: Gas (dangerous media)
– D: Dust (dangerous media)
– T85°C: Maximum surface temperature of the transmitter enclosure with a Ta from -50°C to +40°C for Dust (not Gas) with a dust
layer up to 50 mm depth. T85°C: as before for Dust for a Ta +85°C.
Certificate IECEx Ex ia IIC T4/T5/T6 Ga/Gb and Ex ia IIIC T85°C Da
IECEx certificate number IECEx FME 16.0003X (Tremezzina, Warminster, Bangalore, Shanghai and Dammam products)
The other marking refers to the protection type used according to relevant EN standards:
– Ex ia: Intrinsic safety, protection level “a”
– IIC: Gas group
– T4: Temperature class of the transmitter (corresponding to 135°C max) with a Ta from -50°C to +85°C
– T5: Temperature class of the transmitter (corresponding to 100°C max) with a Ta from -50°C to +40°C
– T6: Temperature class of the transmitter (corresponding to 85°C max) with a Ta from -50°C to +40°C
About the applications, this transmitter can be used in Zone “0” (Gas) classified areas (continuous hazard) with its “process
part” only, whereas the remaining part of the transmitter, i.e. its enclosure, can be used in Zone 1 (Gas), only (see sketch below).
Reason of this is the process part of the transmitter (normally called primary transducer) that provides inside separation elements
to seal off the electrical sensor from the continuously hazardous process, according to the EN 60079-1. About Dust application, the
transmitter is suitable for “Zone 21” according to the EN 60079-0 and EN 60079-11 as shown on the relevant part of the sketches.
Application for pressure transmitter Ex ia categories 1/2 Ga and 1/2 Da
IMPORTANT