KROHNE IFC 210 E Short EN - Manual (Page 6)

Sect. 1.3.3 Part A System installation and start-up
6 IFC 210 E 05/2002
1.3.3 Grounding of primary head
•
All flowmeters must be 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.
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!
1.3.4 Cable lengths (max. distance between signal converter and primary head)
Abbreviations and explanatory notes
used in the following tables, diagrams and connection diagrams
A
Signal cable A (type DS), with double shielding, see diagram A for max. length
B Signal line B (type BTS) with triple shielding, max. length see diagram B
C Field current cable min. cross-section (AF) and max. length, see Table
D High-temperature silicone cable, 3 × 1.5 mm
2
(14 AWG) Cu, (with single shielding,
max. length 5 m (16 ft)
E High-temperature silicone cable, 2 × 1.5 mm
2
(14 AWG) Cu, max. length 5 m (16 ft)
A
F
Cross section of field current line C in Cu, see table
L Cable length
κ Electrical conductivity of the process liquid
ZD Intermediate connection box required in connection with cables D and E for primary heads
ALTOFLUX IFS 4000 F, PROFIFLUX IFS 5000 F and VARIFLUX IFS 6000 F in cases
where process temperatures exceed 150 °C (302 °F)