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1.5
Electrical connections of primary head
1.5.1 Connection to power
Electrical connection in conformity with VDE 0100 / EN 61010-1
“Regulations governing heavy-current installations with rated voltages up to 1000 V”
or equivalent national standard.
The electronics unit on top of the primary head needs a power supply of 115/230 V 48-63 Hz (14 VA), other voltages are
available as an option.
Please observe the information given on the nameplate of the primary head or in the terminal box about voltage and frequency.
Please see also connection diagram in sect. 1.5.6.
1.5.2 Data interface between primary head and signal converter
Data cable: 3 x 1,5 mm
2
, shielded, for example Liycy, standard 10 meter included. For information about the connection, see the
connection diagram in sect. 1.5.6. Special attention should be given to the PG9 cable gland, which is necessary to guarantee a
faultless operation of data transfer between the signal converter and the primary head. The shielding of the data cable should
therefore be connected to the housing by means of the two metal rings behind the rubber part in the gland. The shielding must be
put between the two metal rings in a way that the shielding makes contact with the metal rings all around the cable. See also
following figure:
1.5.3 Electrode cable
General information to signal cables type DS and type BTS
General
Krohne signal cables types DS and BTS with foil and magnetic shields will ensure faultless system operation.
•
The signal cable must be a rigid installation. Cables must be secured so they do not move, or must be run in conduit.
•
No separate installation of signal and field power supply cables required - can be run in same conduit along with other signal
and field power cables. Do not run in same conduit with power cables for other devices.
•
Shields are connected via stranded drain wires.
•
Suitable for under water and underground installations.
•
Insulating material flame-retardant to IEC 332.1/VDE 0472
•
Low in halogen and unplasticized.
•
Flexible at low temperatures.
For connection of the cable, see the connection diagram in sect. 1.5.6.
Signal cable type DS
with double shielding
1
Stranded drain wire, 1
st
shield, 1.5 mm
2
(14 AWG)
2
Insulation
3
Stranded wire 0.5 mm
2
(20 AWG)
4
Special foil, 1
st
shield
5
Insulation
6
Mu-metal foil, 2
nd
shield
7
Stranded drain wire, 2
nd
shield, 0.5 mm
2
(20 AWG)
5
6
7
8
1
2
3
4
