Siemens SITRANS F M MAG 3100 sensor Operating Instructions Manual page 16

Safety notes
2.2 Installation in hazardous area
14
WARNING
Potential equalization
In operation, the output is earthed through the conductive medium being measured and
therefore potential equalisation is necessary throughout the hazardous area.
The apparatus housing shall be connected to the potential equalising conductor in the
hazardous area.
WARNING
External connections to Ex e terminals
The external connections to the Ex 'e' Terminals of the Remote version shall comply
with the following:
 The wire conductors shall have a cross-sectional area between 0.5 mm
mm .
2
 No more than one single or multiple strand wire conductor shall normally be
connected to each of the terminals. If multiple conductors are required, these shall be
joined in a suitable manner, e.g. two conductors into a single insulated crimped boot
lace ferrule.
 The insulation on the wire conductors shall extend to within 1mm of the metal of the
terminal throat.
 The terminal screws shall be tightened down with a torque between 0.5 Nm and 0.7
Nm.
 The terminals shall never be exposed to temperatures outside of the range -50°C to
+ 130°C; in addition, they shall only be installed and wired with cable in an ambient
temperature of -10 to +80°C. Furthermore, in the event of there being a process
temperatures of + 180°C in conjunction with an upper ambient temperature of +50°C
the terminal strips should not be installed or wired with cable.
WARNING
Explosive gas or dust
The terminal box shall not be opened when an explosive gas or dust atmosphere may
be present.
WARNING
Do NOT open the device while energized; otherwise there is a risk of explosion.
WARNING
Laying of cables
Cable for use in zone 1 and 2 or 21 and 22 must satisfy the requirements for having a
proof voltage < AC 500 V applied between the conductor/ground, conductor/shield and
shield/ground.
Connect the devices that are operated in hazardous areas as per the stipulations
applicable in the country of operation, e.g. for Ex "d" and "nA", permanent cables must
be laid.
SITRANS F M MAG 3100 sensor
Operating Instructions, 09/2012, A5E03005599-02
and 2.5
2