ABB 266 HART Series, Operating Instruction

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68 OI/266/HART-EN Rev. D | 2600T Series Pressure transmitters
266 Models - HART
c) Certificate ATEX II 1/2 G Ex d IIC T6
ATEX II 1/2 D Ex tD A21 IP67 T85°C (-50°C ≤ Ta ≤+75°C)
FM Approvals Certificate number FM09ATEX0023X (Lenno products) and FM09ATEX0068X (Minden products)
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 (ambient temperature) +75°C for Dust (not Gas) with
a dust layer up to 50 mm depth.
(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 d: Explosion proof
IIC: Gas group
T6: Temperature class of the transmitter (which corresponds to 85°C max) with a Ta from -50°C to +75°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 61241-1 as it is shown on the relevant part of
the sketch:
Zone “0” Zone “1”
Dangerous
medium
(process)
Tank
Zone “0” / Zone “1”
separation element
Primary transducer
Application for pressure transmitter Ex d categories 1/2G and 1/2D
Application with Gas
266 Tx
Category 1/2 G Ex d
Zone “20” Zone “21”
Dangerous
medium
(process)
Silo
Note: the protection is mainly
assured by the “IP” degree
associated to the low power from
supply.
266 Tx
Category 1/2 D Ex d
IP code
About the degree of protection provided by the enclosure of the pressure transmitter, the 2600T SERIES has been certified IP67
according to EN 60529 standard. The first characteristic numeral indicates the protection of the inside electronics against ingress of
solid foreign objects including dusts.
The assigned “6” means an enclosure dust-tight (no ingress of dust).
The second characteristic numeral indicates the protection of the inside electronics against ingress of water. The assigned “7”means
an enclosure water-protected against a temporary immersion in water under standardized conditions of pressure and time.
Application with Dust