Owner's manual

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1.3 Electrical connection of separate primary head (F Versions)

1.3.1 General information on signal cable A and field current cable C

Use of the Krohne signal cable A with foil screen and magnetic shield will ensure proper operation

of the equipment.

• Signal cable to be solidly laid.

• Connect shields via stranded drain wires.

• Underwater and underground installation possible.

• Insulating material is flame-retardant to IEC IEC 332.1 / VDE 0742.

• Signal cables are low in halogen, unplasticized, and stay flexible at low temperatures.

gnal cable A (Type DS), with double shielding

1 Stranded drain wire, 1st shield, 1.5 mm

or AWG14

2 Insulation

3 Conductor 0.5 mm

or AWG 20 (3.1 red / 3.2 white)

4 Special foil, 1st shield

5 Inner sheath

6 Mu-metal foil, 2nd shield

7 Stranded drain wire, 2nd shield, 0.5 mm

or AWG20

8 Outer sheath

Field current cable C

with single shielding

Cross-section is dependent on required length of cable, see Table in Sect. 1.3.4.

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.