364Ax-Gx Instruction Manual
56
Certificate groups
Certificate ATEX II 1G Ex ia IIC T6 and II 1D Ex iaD 20 T85°C
ZELM certificate number ZELM 06 ATEX 0302 X
The meaning of ATEX code is as follows:
II :
Group for surface areas (not mines)
1 :
Category
G :
Gas (dangerous media)
D :
Dust (dangerous media)
T85
°
C: Maximum surface temperature of the t ransmitter enclosure with Ta
(ambient temperature) +75
°
C for Dust (not Gas) with a dust layer up to 5
mm. For application with dust la yer between 5 and 50 mm, ma ximum
surface temperature must be consider according to IEC 61241-14 chapter
6.3.3.3.
Note: the number close to the C E 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 E N
standards:
Ex ia :
Intrinsic safety, protection level “a”
Ex iaD 20 : Construction with inside intrinsic safety electronics suitable for Dust-
Zone20
IIC :
Gas group
T6 :
Temperature class of the transmitter ( which corresponds to 85 °C
max) with a Ta (ambient temperature) +40°C
About the applications, this transmitter can be used in “Zone 0” (Gas) and "Zone 20"
(Dust) classified areas (continuous hazard) as it is shown on the picture on the right.
Application with Gas
Note: the transmitter must be connected to a supply
(associated apparatus) certified [Ex ia]
Application with Dust
Note: the protection is mainly assured by the "IP
degree" associated to the low power from the
supply certified [Ex ia]
Certificate ATEX II 1/2 G Ex ia IIC T6 and II 1/2D Ex iaD 21 T85°C
ZELM certificate number ZELM 06 ATEX 0302 X
Note: this ATEX Category depe nds on the application (see below ) and also on the
intrinsic safety level of the tran smitter supply ( associated apparatus) which ca n
sometimes suitably be [ib] instead of [ia]. As it is well known, the level of an intrinsic
safety system is determined by the lowest leve l 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 m eans that onl y a part of the tr ansmitter complies w ith
category 1 and a second part complies with category 2 (see picture on the
right)
G :
Gas (dangerous media)
D :
Dust (dangerous media)
T85°C:
Maximum surface temperature of the transmitt er enclosure with Ta
(ambient temperature) +75°C for Dust (not Gas) with a dust layer up to 5
mm. For application with dust la yer between 5 and 50 mm, ma ximum
surface temperature must be consider according to IEC 61241-14 chapter
6.3.3.3.
Note: the number close to the C E 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 E N
standards:
Ex ia :
Intrinsic safety, protection level “a”
Ex iaD 21 : Construction with inside intrinsic safety electronics suitable for Dust-
Zone21
IIC :
Gas group
T6 :
Temperature class of the transmitter ( which corresponds to 85 °C
max) with a Ta (ambient temperature) +40°C
About the applications, this transmitter c an 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 pictures
on the right). Reason of this is th e process part of the transmitter (normally called
primary transducer) that provides inside separation elements to seal off th e
electrical sensor from the continuously hazardous process, according to the
EN50284 and EN50018. About Dust application, the transmitter is suitable for "Zone
21" according to the EN 50281 as it is shown on the relevant part of the pictures on
the right.
Application with Gas
Note: the transmitter can be connected to either [ib]
or [ia] supply (associated apparatus)
Application with Dust
Note: the protection is mainly assured by the "IP
degree" associated to the low power from the
supply. This can either be [ib] or [ia]
Zone “0”
364 Tx
Category 1G
Ex ia
Zone “20”
364 Tx
Category 1D
IP6x
(Ex ia)
