KROHNE OPTISONIC 3400 Ex EN - Manual (Page 16)

3
CONNECTION OF SEPARATE SYSTEMS
16
OPTISONIC 3400
www.krohne.com 10/2013 - 7312472200 - AD EX OPTISONIC 3400 -en- R02
3.1 General
In the case of separate systems, the electrical connection between OPTISONIC 3000 F/...-Ex
ultrasonic flow sensor and UFC 400 F...-Ex ultrasonic signal converter is established via a signal
cable of type MR06-RG316. This cable consists of six coaxial cables surrounded by an additional
screen and outer insulation layer. The ends of the coaxial cables are provided with SMB plugs.
The signal cable is included with the field system by KROHNE.
3.2 Cable marking
The SMB plugs of the coaxial cables are marked by yellow tubing with a black number of
subsequently 1.1, 1.2, 2.1, 2.2, 3.1 and 3.2. The first number represents the path 1, 2 or 3 and the
second the transducer of that path (1 or 2). The marking of the SMB counter-plugs in the
connection box of the signal converter is respectively 1.1, 1.2, 2.1, 2.2, 3.1 and 3.2. Also refer to
Signal cable connections (filed versions) on page 17 for the connection of the several connection
box types.
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
; 0.37 mH or 1.07 mH
The cable supplied by the manufacturer has the following parameters:
distributed capacitance C
C
(core/screen) = 94 pF/m
distributed inductance L
C
(core/screen) = 0.24 μH/m
INFORMATION!
The standard length of the signal cable is 5 m / 16.4 ft. In case a longer length is required, please
contact your local representative for detailed information.
INFORMATION!
More than 30 m signal cable length is not recommendable, it will have a negative effect on the
measuring accuracy.