KROHNE IFC 020 Short EN User Manual

Page 4

Condensed instructions IFC 020

1/3

Field current line C (single shielding with IFC 020 F)
Line 2 x 0.75 mm

(18 AWG) Cu, 2 x 1.5 mm

(14 AWG) Cu or 2 x 2.5mm

(12 AWG) Cu

single shielding (Cu = copper cross section)

The cross section depends on the required cable length, see table in Section 1.3.4.

1.3 Electrical connection of separate primary heads (F- and E- versions)

1.3.1 General remarks on signal lines A and B and field current line C

Proper operation of the equipment is ensured when Krohne signal lines A and B are used with foil

screen and magnetic shield.
• Signal lines 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 lines which remain flexible at low temperatures.
Signal line A (type DS) with double shielding

1.3.2 Grounding of primary head

• All flowmeters must be properly grounded.
• The grounding conductor should not transmit any interference voltages.
• Do not ground any other electrical device together with this conductor.
• The primary head is connected to ground by means of an FE functional ground conductor.
• Special information on grounding various primary heads is contained in the separate

installation instructions for primary heads.

• These instructions also contain detailed descriptions on how to use grounding rings and

how to install primary heads in metal or plastic pipes or internally coated pipelines.

1 Stranded drain wire, 1st shield, 1.5 mm

or AWG 14

2 Insulation

3 Stranded wire 0.5 mm

or AWG 20 (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

or AWG 20

8 Outer sheath

Signal line B (type BTS) with triple shielding (bootstrap line), for IFC 020 E only

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

or AWG 20 (5.1 red/5.2 white)

6 Stranded drain wire, 1st shield, 0.5 mm

or AWG 20

(6.1/6.2)

7 Special foil, 2nd shield

8 Stranded drain wire, 2nd shield, 1.5 mm

or AWG 14

9 Insulation

10 Mu-metal foil, 3rd shield

11 Stranded drain wire, 3rd shield, 0.5 mm

or AWG 20

12 Outer sheath