Connection To Controller Unit Regard With Channel Module Regard Ex - Dräger Polytron SE Ex PR NPT1 DD Instructions For Use Manual

Connection to Controller Unit REGARD
with Channel Module REGARD Ex
– The cable resistance must not exceed 10 Ohms per
core.
This results in the following maximum distances for the
various cross-sections:
Core cross-section 1.0 mm
maximum cable
length
Connect terminals 1, 2 and 3 of the sensing heads
with the terminals 10, 11 and 12 of the device rack.
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.
1
10
11
12
16
1
10
11
12
16
2 2
1.5 mm 2.5 mm
450 m 750 m 1200 m
1
2
3
REGARD Ex
1
2
3
REGARD Ex
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 earth-
2 ing it is recommended to connect the cable 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
35