IM 12A06S01-01EN-P
11
5-3. Wiring to the HOST system
Wired connection
The YOKOGAWA HOST system is connected to the SA11 using the WU11 type S
interconnection cable with at one end wired terminals and on the other end a M9 connector.
This cable is specified for reliable transfer of digital signals, and especially designed to
be installed in a heavy industrial environment. The double shielded cable will protect the
connected devices for interference from high voltages and currents which are present on other
cables. The cable is specified to be used in IP67 applications, allowing it to be submerged as
a whole. The WU11 type S cable is available length up to a maximum of 100 meter (328ft).
Connection concept
The YOKOGAWA HOST system model FLXA402 can be connected to maximum five SA11
devices. In case of more than two SA11 devices connected, the BA11 Active Junction Box
must be used. Connection in between the FLXA402 and BA11 is done by using the WU11
type -S interconnection cable with at one end wired terminals and on the other end a M9
connector. Connection in between the BA11 and the SA11 is done using the WU11 type -S
interconnection cable with at both ends a M9 connector. In both cases the maximum length
has to be within 100 meter (328ft).
Wireless connection
In laboratory environments the HOST Fieldmate system can be connected to the SA11
using the YOKOGAWA Bluetooth device model IB100. Interconnection in between the
IB100 and SA11 is done using the WU11 type -S interconnection cable with at both ends a
M9 connector. The wireless communication in between the Fieldmate system and IB100 is
limited to a distance of 10 meter.
Grounding
The measuring system must always be
connected to a class D ground (a ground
resistance of 100 Ohm or less), preferably
done at the HOST side. To protect the
SA11 device against interference, such as
electromagnetic noise or common mode, all
wires in WU11 type -S cable are connected
at HOST. This makes the housing of the
SA11 grounded. For correct measurement
without loss of specifications, it is strongly
recommended to ensure that the process
liquid is grounded. Figure 5.4 shows the
connection diagram in case without/UM
option.
However, in case that there is different potential between Ground at HOST side and Ground
which the housing of the SA11 is connected, figure 5.5 shows the example of the installation.
To prevent ground loop by this different potentials it is necessary to disconnect one of the
ground references. This can be done at the HOST side by disconnecting the wire #82 of the
WU11 type S cable. Please connect #82 to NC terminal on the SENCOM SA module when
SA11 is connected to FLXA402. Please be sure to insulate contact pin of #82 wire from
terminals and metal housing, when SA11 is connected to other host. The SA11 device must
then be installed using the optional pipe and wall mounting hardware (/UM) with a ground wire
Host
Ground 1
Sensor
SA11
WU11
(max 100m)
Liquid
Ground 2
Figure 5.4: Typical installation of
SA11 to host