IM 12D08N05-01E
3-13
<3. INSTALLATION AND WIRING>
3.6.4 Sensor cable connections using junction box (BA10)
and extension cable (WF10)
Where a convenient installation is not possible using the standard cables between sensors
and converter, a junction box and extension cable may be used. The Yokogawa BA10
junction box and the WF10 extension cable should be used. These items are manufactured
to a very high standard and are necessary to ensure that the specifications of the system
can be met.
The total cable length should not exceed 60 metres (e.g. 5 m fixed cable and 55 m
extension cable).
14 Overall Screen
11
12
12
13
14
14
16
15
13
14
14
16
15
17
11
17
11 Red
12 Blue
13 Core 17 Screen
Brown Co-axial Cable
15 Core 16 Screen
White Co-axial cable
17 (screen)
14 (overall screen)
12 (blue)
11 (red)
13 (core)
16 (screen)
15 (core)
Co-axial cable
(white)
Co-axial cable
(brown)
11
12
13
14
15
16
17
BA10
WF10
EXA CONVERTER
11
12
13
14
15
16
17
Figure 3.10 Connection of WF10 extension cable and BA10 junction box
Extension cable may be purchased in bulk quantities or in pre-finished lengths. In the case
of bulk quantities cut to length, then it is necessary to terminate the cable as shown below.
Termination procedure for WF10 cable.
1. Slide 3 cm of heat shrink tube (9 x 1.5) over the cable end to be terminated.
2. Strip 9 cm of the outer (black) insulating material, taking care not to cut or damage
internal cores.
3. Remove loose copper screening, and cut off the cotton packing threads as short as
possible.
4. Strip insulation from the last 3 cm of the brown, and the white coaxial cores.
5. Extract the coaxial cores from the braid, and trim off the black (low-noise) screening
material as short as possible.
6. Insulate the overall screen and the 2 coaxial screens with suitable plastic tubing.
7. Strip and terminate all ends with suitable (crimp) terminals and identify with numbers
as shown.
8. Finally shrink the overall heat shrink tube into position.
