ABB 266D Series Short Form Instruction Manual page 16

... "EX SAFETY" ASPECTS AND "IP" PROTECTION (EUROPE)
c) Certificate ATEX II 1/2 G Ex d IIC T4÷T6 -
ATEX II 1/2 D Ex tD A21 IP67 T85°C (-50°C ≤ Ta ≤+75°C)
FM Approvals Certificate number FM09ATEX0023X respectively FM09ATEX0068X
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 (ambient temperature) +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:
APPLICATION FOR PRESSURE TRANSMITTER EX d CATEGORIES 1/2G and 1/2D
Application with Gas
Tank
Zone "0"
dangerous
medium
(process)
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 forein 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.
16 SOI/266-XC | 2600T Series Pressure transmitters 266 models
Zone "1"
266 Tx category
1/2G Ex d
Primary
transducer
Zone 0 / Zone 1
Separation elements
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.
Silo
Zone "21"
266 Tx category
1/2D Ex d
Primary
transducer
Zone 0 / Zone 1
Separation elements