ABB 2600T-Serie Bedienungsanleitung Seite 18

b) Certificate ATEX II 1/2 G Ex ia IIC T4/T5/T6 and
II 1/2 D Ex iaD 21 T85°C
FM Approvals certificate number
FM09ATEX0024X (Lenno products)
FM09ATEX0069X (Minden products)
FM11ATEX0035X (Faridabad products)
Important. This ATEX Category depends on the application
(see below) and also on the intrinsic safety level of the
transmitter supply (associated apparatus) which can
sometimes suitably be [ib] instead of [ia]. As it is well known,
the level of an intrinsic safety system is determined by the
lowest level of the various apparatus 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.
Application for pressure transmitter Ex ia categories 1/2G and 1/2D
Application with Gas
Tank
Zone "0"
Dangerous
medium
(process)
Note: the transmitter can be connected to either [ib] or [ia]
supply (associated apparatus)certified [Ex ia]
Note for "Primary transducer": see the certification for exceptions
18 SOI/266-XC Rev. D | 2600T Series Pressure transmitters
Zone "1"
Primary transducer
266 Tx
Category
1/2 G Ex ia
Zone "0" / Zone "1"
separation element
(Note: the number close to the CE marking of the transmitter
safety label identifies the Notified Body which has responsibility
for the surveillance of the production)
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 60079-26 and EN 60079-1. About Dust application, the
transmitter is suitable for "Zone 21" according to the
EN 61241-0 and EN 61241-11 as it is shown on the relevant
part of the sketches.
Application with Dust
Zone "20"
Dangerous
medium
(process)
Note: the protection is mainly assured by the "IP" degree
associated to the low power from supply. This can either be [ia]
or [ib]
7 Hazardous area considerations
Silo
Zone "21"
266 Tx
Category
1/2 D Ex ia