Ex Relevant Specifications; Explosion Protection Requirements And Ip Rating (Atex); Applications For "Ex Ia" Transmitters Categories 1 G And 1 D; Example Applications - ABB 2600T Series Operating Instruction

13 Ex relevant specifications

13.1 Explosion protection requirements and IP rating
(ATEX)
According to ATEX Directive (European Directive 2014/34/EU)
and applicable European standards which assure compliance
with essential safety requirements, i.e.,
— EN 60079-0 (General requirements)
— EN 60079-1 (Equipment protection by flameproof
(enclosures) "d")
— EN 60079-11 (Equipment protection by intrinsic safety "i")
— EN 60079-15 (Electrical equipment for explosive gas
atmospheres - Part 15: Construction, test and tagging of
type of protection "n" electrical equipment)
— EN 60079-26 (Equipment with equipment protection level
(EPL) - Ga)
— EN 61241-0 (General requirements)
— EN 61241-1 (Enclosure "tD")
— EN 61241-11 (Protection by intrinsic safety "iD")
the transmitters are certified for the following device groups,
categories, and media in dangerous atmosphere, temperature
classes, and types of protection. Simple sketches of example
applications appear below.
IMPORTANT (NOTICE)
The temperature sensor circuit (Pt100) and the
digital output (pulse / limit value output) must be
connected in accordance with the requirements
of the Ex certificate.
The sensor for measuring process temperature
(Pt100) must be approved for use in hazardous
areas.
13.2 Applications for "Ex ia" transmitters categories 1 G
and 1 D
ATEX II 1 G Ex ia IIC T4/T5/T6 and II 1 D Ex iaD 20 T85°C.
FM approval FM09ATEX0069X
The meaning of the ATEX code is as follows:
II: Equipment group for hazardous areas above
ground (not mines)
1: Category
G: Gas (dangerous media)
D: Dust (dangerous media)
T85°C: Maximum surface temperature of the transmitter
housing at an ambient temperature Ta of up to 40
°C for dust (not for gas) with a dust layer up to
50 mm thick.
68 OI/266CXX/266JXX/HART-EN Rev. B | 266CRx, 266JRx, 266CSx, 266JSx
The rest of the tag relates to the type of protection according
to the relevant EN standards:
Ex ia: Type of protection "Intrinsic Safety", level of
protection "a"
IIC: Explosion group gases
T4: Temperature class of the transmitter (corresponds
to a maximum surface temperature of 135 ) with a
Ta from -50 °C ... 85
T5: Temperature class of the transmitter (corresponds
to a maximum surface temperature of 100 °C) with
a Ta from -50 °C ... 40 °C
T6: Temperature class of the transmitter (corresponds
to a maximum surface temperature of 85 °C) with a
Ta from -50 °C ... 40 °C

13.2.1 Example applications

As shown in the figures below, the transmitter can be used in
Zone 0 (gas) and Zone 20 (dust).
Application with gas
Zone 0
266 Tx category 1G Ex ia
IMPORTANT (NOTICE)
The transmitter must be connected to a power
supply unit (associated device) with "Ex ia"
certification.
Application with dust
Zone 20
266 Tx category 1D IP6x (Ex ia)
IMPORTANT (NOTICE)
Protection is afforded primarily by the IP degree
of protection; the low level of power consumed
from the power supply unit is also a contributing
factor. The type of protection can be either [ia] or
[ib].
WARNING - General danger for Model 266
used in Zone 0!
The housing contains aluminum, which can lead
to a potential danger of ignition through impact or
friction. For this reason, impact or friction must be
avoided during installation and use.