8
e.
Wiring
for
a
Hazardous
Area
Installation
CAUTION:
This
section
provides
general
guidelines
for
hazardous
area
wiring.
However,
regardless
of
anything
stated
here,
the
MS2901E
must
be
installed
in
full
compliance
with
the
control
drawing
located
on
page
18
and
all
of
the
local
area
requirements.
ATTENTION
:
Cette
section
fournit
des
directives
générales
pour
le
câblage
en
zone
dangereuse.
Cependant,
indépendamment
de
tout
ce
qui
est
indiqué
ici,
le
MS2901E
doit
être
installé
conformément
au
schéma
de
contrôle
situé
à
la
page
18
et
à
toutes
les
exigences
locales.
Whenever
an
electrically
driven
sensor
or
measuring
device
is
used
in
a
potentially
explosive
environment
the
measuring
system
must
be
installed
in
such
a
way
that
electrical
energy
is
either
effectively
isolated
from
the
explosive
environment
(via
explosive
‐
proof
containers,
cable
conduits,
etc.)
or
the
amount
of
electrical
energy
produced
in
the
hazardous
area
must
be
limited
to
a
permitted
level.
Limiting
electrical
energy
is
the
most
practical
method
of
protecting
the
MS2901E
measuring
system
when
the
Transmitter
is
installed
in
a
hazardous
area.
In
the
MS2901E
system,
electrical
energy
limits
are
maintained
using
a
power
supply
with
Um
of
28V
installed
in
the
4
‐
20
mA
current
loop
per
standard
practice.
The
voltage
shall
be
maintained
all
the
time
in
accordance
with
the
guidance
given
in
IEC
60079
‐
14.
Caution:
In
general
Safety
barriers
are
not
necessary
but
when
a
safety
barrier
is
used
with
the
MS2901E
system,
the
current
loop
cable
must
be
connected
to
the
barrier’s
hazardous
area
terminals
and
the
barrier
output
voltage
should
not
exceed
28V
at
any
circumstances.
All
other
connections
must
be
made
to
the
barrier’s
safe
area
terminals.
The
type
of
repeater
safety
barrier
employed
in
the
MS2901E
system
depends
on
the
specific
classification
of
the
hazardous
environment
in
question.
Metal
Samples
will
provide,
upon
request,
assistance
and
technical
advice
in
the
selection
of
a
repeater
safety
barrier
or
its
equivalent.
The
maximum
length
of
the
current
loop
cable
that
connects
the
MS2901E
Transmitter
to
the
repeater
safety
barrier
is
as
follows:
Example:
17.5
Volts
22
AWG
Cable
=
5,434
feet
maximum
16
AWG
Cable
=
21,788
feet
maximum
CAUTION:
For
hazardous
area
installations,
the
maximum
inductance
and
capacitance
of
the
loop
wiring
between
the
safety
barrier
and
the
transmitter
cannot
exceed
the
entity
parameters
of
the
selected
barrier.
ATTENTION
:
Pour
les
installations
en
zone
dangereuse,
l'inductance
et
la
capacité
maximales
du
câblage
de
la
boucle
entre
la
barrière
de
sécurité
et
le
transmetteur
ne
peuvent
pas
dépasser
les
paramètres
d'entité
de
la
barrière
sélectionnée.
Содержание MS2901E
Страница 2: ......
Страница 4: ......
Страница 40: ...36 MicroLink HART modem connected across the HART device MicroLink HART modem connected across the HART device...
Страница 45: ...41 Appendix B Hazardous Area Certification Details...
Страница 46: ...42...
Страница 47: ...43...
Страница 48: ...44...
Страница 49: ...45...
Страница 50: ...46...
Страница 51: ...47...
Страница 52: ...48 Appendix C Drawings A Wiring Diagrams Control Drawing Hazardous Area Wiring Diagram...
