6 OI/TTR200-EN Rev. B | TTR200
2.4 Installation instructions
2.4.1 ATEX / IECEx
The installation, commissioning, maintenance and repair of
devices in potentially explosive atmospheres must only be
carried out by appropriately trained personnel. Works may be
carried out only by persons, whose training has included
instructions on different types of protection and installation
techniques, concerned rules and regulations as well as general
principles of zoning. The person must possess the relevant
expertise for the type of works to be executed.
When operating with combustible dusts, EN 60079-31 must
be complied with.
The safety instructions for electrical apparatus in potentially
explosive areas must be complied with, in accordance with the
directive 2014/34/EU (ATEX) and e.g. IEC
60079-14 (Installation of equipment in potentially explosive
atmospheres).
To ensure safe operation, the respectively applicable
requirements must be met for the protection of workers.
2.4.2 Electrical connections
Grounding
If, for functional reasons, the intrinsically safe circuit needs to
be grounded by means of a connection to the potential
equalization, it may only be grounded at one point.
Intrinsic safety proof
If transmitters are operated in an intrinsically safe circuit, proof
that the interconnection is intrinsically safe must be provided
in accordance with IEC/EN 60079-14 as well as
IEC/EN 60079-25.
The supply isolators / DCS inputs must feature intrinsically
safe input protection circuits in order to eliminate hazards
(spark formation).
In order to provide proof of intrinsic safety, the electrical limit
value must be used as the basis for the EC-type examination
certificates for the equipment (devices); this includes the
capacitance and inductance values of the cables.
Proof of intrinsic safety is said to have been provided if the
following conditions are fulfilled when a comparison is carried
out in relation to the limit values of the equipment:
Transmitters
(intrinsically safe equipment)
Supply isolator / DCS input
(related equipment)
U
i
≥ U
o
I
i
≥ I
o
P
i
≥ P
o
L
i
+ L
c
(cable) ≤ L
o
C
i
+ C
c
(cable) ≤ C
o
Field (Ex area) Control room (safe area)
Fig. 1
A Transmitter B Supply isolator / DCS input with supply / Segment
coupler
Installation in a potentially explosive atmosphere
Transmitters can be installed in all kinds of industrial sectors.
Potentially explosive systems are divided into zones,
meaning that a wide range of different instruments are also
required. For this, pay attention to the country-specific
guidelines and certificates!
NOTICE
Ex relevant specifications must be taken from the EC-type
examination certificates and other relevant certificates that
apply in each case.
ATEX - Zone 0
Marking: II 1 G Ex ia IIC T6 Ga
Ex area Zone 0 Safe area
Fig. 2
A Sensor B Transmitter in the housing with IP rating IP 20
C Supply isolator [Ex ia]
When used in zone 0, the input for the supply isolator must be
in [Ex ia] design.
When using the transmitter in Zone 0, you must ensure that
impermissible electrostatic charging of the temperature
transmitter is prevented (observe the warnings on the device).
As the user, it is your responsibility to ensure that the sensor
instrumentation meets the requirements of applicable
explosion protection standards.
A10096
AB
+
-
+
-
A10208
ia
ia
J
ACB
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