KROHNE IFC 210 E-EEx EN - Manual (Page 8)

Sect. 1.3.1 Part A System installation and start-up
IFC 210 E 05/2002
8
1.3 Electrical connection of separate primary heads
1.3.1 General remarks on signal cables A and B and field current line C
Proper operation of the equipment is ensured when KROHNE signal cables A and B are used with
foil screen and magnetic shield.
•
Signal cables must be firmly installed.
•
Shields are connected via stranded drain wires.
•
Underwater or underground routing is possible.
•
Insulating material flame-retardant to IEC 332.1 / VDE 0742.
•
Low-halogen, unplasticized signal cables which remain flexible at low temperatures.
Signal cable A (type DS) with double shielding
1 Stranded drain wire, 1st shield, 1.5 mm 2
2 Insulation
3 Stranded wire 0.5 mm
2 (3.1 red/3.2 white)
4 Special foil, 1st shield
5 Insulation
6 Mu-metal foil, 2nd shield
7 Stranded drain wire, 2nd shield, 0.5 mm
2
8 Outer sheath
Signal cable B (type BTS) with triple shielding (bootstrap line)
1 Dummy glider wire
2 Insulation (2.1 red/2.2 white)
3 Special foil, 1st shield (3.1/3.2)
4 Insulation (4.1/4.2)
5 Stranded wire 0.5 mm
2 (5.1 red/5.2 white)
6 Stranded drain wire, 1st shield, 0.5 mm
2
(6.1 / 6.2)
7 Special foil, 2nd shield
8 Stranded drain wire, 2nd shield, 1,5 mm
2
9 Insulation
10 Mu-metal foil, 3rd shield
11 Stranded drain wire, 3rd shield,, 0,5 mm
2
12 Outer sheath
Field current line C
Line 2 × 0,75 mm
2
, 2 × 1,5 mm
2
or 4 × 1,5 mm
2
Cu, single shielding
(Cu = copper cross section)
The cross section depends on the required cable length, see table in Section 1.3.4.
IMPORTANT!
For EEx versions, also pay regard to all special directions included in Sect. 6.1
and 13.
Only the EEx primary head may be installed in the hazardous area.
The signal converter must be installed outside the hazardous area!