Yokogawa SC4A 19mm Conductivity Sensors - Manual (Page 12)

IM 12D7J4-E/D/F-H
6
ENGLISH
2. INSTALLATION
2-1. Connection
The cable is six wire multicore and covered
with a thermoplastic TPE. The wires are
also covered with thermoplastic TPE indivi-
dually and coloured. The cable connections
are supplied with 2 mm terminations for
connection to the transmitter, or connec-
tion box: these pins quarantee a correct
and simple connection to the terminals.
At the instrument end the cable termination
tags are numbered to correspond with their
respective terminals of the transmitters.
NOTE:
If the cable is used with a connection box,
type BA10 (BP10 for Intrinsically Safe appli-
cations) then special purpose cable, type
WF10 must be used between connection
box and transmitter connected to the same
terminals as the cell cable. A maximum
of 50 metres total cable length is permissa-
ble.
2-2. Mounting
The mounting is by a compression gland or
sanitary adapter, giving a simple effective
method of direct insertion in process
pipework. For mounting the retractable
sensor refer to the instruction manual of
the PR4A retractable holder.
Before mounting a cell in a process plant
environment the following points should be
considered:
- a good, representative, flow of process
liquid through the cell should exist.
Hence, the cell must be mounted in the
process in such a way that the flow
through it represents the true composition
of the liquid. The flow through the cell
should be uninterrupted and the cell
should not be mounted at a “dead”
angle.
- a cell must be immersed in the process
liquid to a level above the outlet to ensure
an uninterrupted liquid path between the
electrodes.
Figure 2-1. WF10 Cable
overall
shield
screen
B
E
A
C
D
- the cell should be mounted in such a
way to allow easy removal for maintenan-
ce. It is recommended that the cell is
mounted in a ‘by-pass’ directly behind a
drain valve.
2-3. Safety warning
For SC4A..AD to avoid the sensor shoot-
ing out, never install in application where
pressure can exceed specified maximum.
Never loosen mounting nut while system is
pressurised.