KROHNE OPTISONIC 6300 EEx EN - Manual (Page 13)

CONNECTION OF SEPARATE SYSTEMS
3
13
OPTISONIC 6300
www.krohne.com 03/2010 - 7309972300 - EX OPTISONIC 6300 R03 en
3.1 General
The electrical connection between the ultrasonic flow sensor and the signal converter is
established with MR 02 - RGX 316 triax signal cable. The ends of the coaxial cables are provided
with SMB plugs. The signal cable is provided with the system.
3.2 Cable marking
Please refer to Signal cable connections on page 14 for the connection of the different versions.
3.3 Cable parameters
The maximum permitted total capacitance and inductance for the connecting cable is:
C
L
= 1,29 μF or 0,79 μF
L
L
= 0,1 mH or 0,8 mH
The cable supplied with the instrument has the following parameters:
distributed capacitance C
C
(core/screen) = 94 pF/m
distributed inductance L
C
(core/screen) = 0,24 μH/m
3.4 Equipotential bonding
3.4.1 Signal converter
The UFC 300 F(/i)-Ex ultrasonic signal converter must always must always must always must always be incorporated within the
equipotential bonding system of the installation in the hazardous classified location. For this
purpose it must be connected to the external U-clamp screw terminal (size M5) on the wall-
mounting device.
The separate bonding conductor must be at least 4 mm
2
(11 AWG) or 2.5 mm
2
(14 AWG) in case it
is mechanically protected, see Clause 413 of HD 384.4.41 or IEC 364-4-41. Make sure that the
core of the bonding wire is properly mounted under the U-clamp of the external M5 terminal and
that the screw is tightly fixed.
3.4.2 Flow sensor
The intrinsically safe transducer circuits of the flow sensor are galvanically isolated from earth,
therefore an equipotential bonding conductor between the flow sensor and the signal converter
does not have to be connected.
INFORMATION!
The standard length of the signal cable is 5 m. In case a longer length is required, please contact
your local representative for detailed information.