Samson 3730 Series Mounting And Operating Instructions page 77

Equipment for use in zone 2/zone 22
In equipment operated according to type of
protection Ex nA (non-sparking equipment)
according to EN 60079-15, circuits may be
connected, interrupted or switched while en-
ergized only during installation, mainte-
nance or repair.
The special conditions of use mentioned in
the statement of conformity must be ob-
served for the rated values and the installa-
tion of the series-connected fuse for intercon-
nection of Ex nA circuits.
For Ex nA equipment (non-sparking equip-
ment), circuits may be connected, interrupted
or switched while energized only during in-
stallation, maintenance or repair.
− Positioners with type of protection Ex nA
or Ex tc can be used with a cover with or
without window.
− The Type 3730-41, Type 3730-45 and
Type 3730-48 Positioners are 100 %
identical in design, except for the mark-
ing and the housing cover.
− For type of protection Ex nA, the VCC
connection in the interface adapter must
be connected in series with a fuse ac-
cording to IEC 60127, 250 V F or T with
a fuse rating of I
The fuses must be installed outside the haz-
ardous area.
EB 8384-4 EN
≤40 mA.
N
Cable entry
Cable entry with M20x1.5 cable gland, 6 to
12 mm clamping range (see accessories in
Table 5-4).
There is a second M20x1.5 threaded hole in
the housing that can be used for additional
connection, when required. The screw termi-
nals are designed for wire cross-sections of
0.2 to 2.5 mm². Tighten the screws by 0.5 to
0.6 Nm.
Note
The power supply for the positioner can be
supplied either over the connection to the
fieldbus segment or over a DC voltage
source (9 to 32 V) connected to the bus ter-
minals in the positioner.
Observe the relevant regulations for instal-
lation in hazardous areas.
Installation
5-43