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2 6 6 D D S H A R T | P R E S S U R E T R A N S M I T T E R S | O I/ 2 6 6 D D S - E N R E V. A
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
pressure transmitters of the 2600T SERIES 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.
Certificate ATEX II 1/2 G Ex db IIC T6 Ga/Gb
and II 1/2 D Ex tb IIIC T85°C Db, Ta = -50°C to +75ºC
FM Approvals Certificate number FM09ATEX0023X
(Tremezzina plant)
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.
Important. 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.
Application for pressure transmitter Ex d categories 1/2 G and 1/2 D
Application with Gas
Zone "0"
Dangerous
medium
(process)
Tank
Zone "1"
Primary
transducer
266 Tx
Category 1/2 Ga Ex db
Zone "0" / Zone "1"
separation element
ATEX transmitter with the following types of protection:
"flameproof enclosure Ex db" and "dust ignition protection by
enclosure Ex tb" in accordance with Directive 2014/34/EU
Transmitter with 4 to 20 mA output signal and HART communication
Certificate no.
FM09ATEX0023X
Marking
II 1/2 G Ex db IIC T6 Ga/Gb Ta=–50 °C to +75 °C,
II 1/2 D Ex tb IIIC T85 °C Db Ta = –50 °C to +75 °C;
IP66, IP67.
Permissible ambient temperature versus process temperature
Type of protection
II 1/2 G Ex db IIC T6 Ga/Gb
II 1/2 D Ex tb IIIC T85 °C Db
Power supply and signal circuit with "flameproof enclosure Ex db
and Ex tb" type of protection, with the following maximum values
Application with Dust
Silo
Zone "20"
Dangerous
medium
(process)
Process
Max . ambient
temperature
temperature
≤ 121° C
75° C
≤ 121° C
75° C
U = 42 Vdc
P = 2 W
Zone "21"
266 Tx
Category 1/2 Db Ex tb
31
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