Connection To Controller Unit Polytron With Channel Module Polytron Se Ex - Dräger Polytron SE Ex PR M1 DD Gebrauchsanweisung

Connection to Controller Unit Polytron with
Channel Module Polytron SE Ex
– The cable resistance must not exceed 20 Ohms per
core.
This results in the following maximum distances for the
various cross-sections:
Core 1.0 mm
cross- section
maximum cable
length
 Connect terminals 1, 2 and 3 of the sensing heads
with the terminals 1, 2, and 3 of the device rack as
shown.
 Carefully connect all wires of the signal cable.
The signal cable has to be selected in accordance to
local electrical codes and the temperatures it will be
used in.
3
2
1
+
–
3
2
1
+
–
34
2 2
1.5 mm 2.5 mm
950 m 1450 m 2400 m
3
2
1
Polytron SE Ex
1 ... 12
3
2
1
Polytron SE Ex
1 ... 12
Remark concerning shielding:
The metallic housings of the sensing heads Polytron
SE Ex HT M DD, Polytron SE Ex PR NPT1 DD and
SE Ex LC NPT1 DD need to be earthed at side by
means of their external PE-terminals. To avoid double
earthing it is recommended to connect the cable
2
shielding to the internal PE-terminal of the housing and
not to the PE-terminal at the controller site.
This drawing is exemplary for sensing heads
Polytron SE Ex PR M1 DD / Polytron SE Ex LC M1 DD
and Polytron SE Ex HT M DD:
CAUTION
1 2 3
4
1 2 3
1
2
3
4
PE