Connection to Dräger REGARD SE Ex channel card1
— When the current amounts to 200 mA (recommended), the line resistance must not exceed 10 Ohm per core.
When the current amounts to 400 mA, the line resistance must not exceed 8 Ohm per core.
For this reason, the various wire cross-sections may have the following maximum line lengths :
z
Connect terminals 1, 2, and 3 of the measuring head with terminals 10, 11, and 12 of the chassis.
z
Carefully connect the measuring line.
Select the measuring lines according to the installation instructions for each operating temperature range.
Connection to Dräger Polytron SE Ex channel card*
— The maximum line resistance depends on the set supply current.
When the current amounts to 200 mA (recommended), the line resistance must not exceed 17 Ohm per core.
When the current amounts to 390 mA, the line resistance must not exceed 10 Ohm per core.
For this reason, the various wire cross-sections may have the following maximum line lengths :
Connect terminals 1, 2, and 3 of the measuring head with terminals 1, 2, and 3 of the chassis.
z
Carefully connect the measuring line.
Select the measuring lines according to the installation instructions for each operating temperature range.
1
The measuring function for the explosion protection according to EN 61779 is proven, see EC-Type Examination certificate BVS 05 ATEX E 143X and asso-
ciated additions.
Wire cross-section
0.5 mm
2
(36 Ohm/km)
0.75 mm
2
(24 Ohm/km)
1.0 mm2
(18 Ohm/km)
1.5 mm
2
(13 Ohm/km)
2.5 mm
2
(8 Ohm/km)
4.0 mm
2
(5 Ohm/km)
Maximum cable length with
supply current of 200 mA
270 m
410 m
550 m
760 m
1,250 m
2,000 m
Maximum cable length with
supply current of 400 mA
220 m
330 m
440 m
610 m
1,000 m
1,600 m
Colour code:
1 = brown
2 = yellow
3 = black
Wire cross-section
0.5 mm2
(36 Ohm/km)
0.75 mm2
(24 Ohm/km)
1.0 mm2
(18 Ohm/km)
1.5 mm2
(13 Ohm/km)
2.5 mm2
(8 Ohm/km)
4.0 mm2
(5 Ohm/km)
Maximum cable length with
supply current of 200 mA
470 m
700 m
940 m
1,300 m
2,100 m
3,400 m
Maximum cable length with
supply current of 400 mA
270 m
410 m
550 m
760 m
1250 m
2000 m
Colour code:
1 = brown
2 = yellow
3 = black
12
24 V
0 V
11
10
REGARD SE Ex
00123867_02.eps
PE
3
2
1
0
S
1
+
–
2
1 ... 12
3
Polytron SE Ex
00323867_02.eps
PE
S