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...4 ELECTRICAL CONNECTIONS
4.3 Wall-/Pipe-mounted Instrument Connections – Fig. 4.4
✶
Note. Refer to Fig. 4.1 for Access to Terminals.
Caution. Slacken terminal screws fully before making connections.
1
2
3
Channel 1
Channel 1
Channel 2
Conductivity Cell
Temperature Compensator
5
–
1
–
Braid
6
–
2
–
7
–
3
–
White
4
–
Black
Earth (Ground) Stud
(on case) –see Fig. 4.1
Refer to Table 4.1 below
for terminal descriptions
Warning. The power supply earth (ground) must be connected to ensure safety to personnel, reduction of the
effects of RFI interference and correct operation of the power supply interference filter.
Caution. The metal braid in the conductivity cell connecting cable must not be earthed (grounded), or
allowed to touch earthed (grounded) components, and must be cut back to the insulation at the conductivity cell end.
✶
Note.
•
Metal cells (isolated from earth [ground]), e.g. if mounted in plastic pipe or pocket – connect terminal 4 to earth
(ground).
•
Metal cells (earthed [grounded]) – ensure that the cell ground potential and that of the instrument's earth (ground)
stud are the same.
n I
t s
u r
m
e
t n
T
y
p
e
W
a
- l l
m
o
u
n
e t
d
P
a
n
e
- l
m
o
u
n
e t
d
D
r
v i
e
o
Table 4.1 Conductivity Cell and Temperature Compensator Terminal Descriptions
10
1
2
3
4
5 6 7
4
5
6
Channel 2
Serial
(If fitted)
Serial
RS422/
RS485
Brown
1
Green/Yellow
2
Blue
3
4
5
6
2
4 –ve
5 +ve
Fig. 4.4 Wall-/Pipe-mounted Instrument Connections
1
2
1
2
1
1
n
c s
e r
e
n
C
l l e
N
A /
u
p t
t u
1
+
–
4
Retrans.
Retransmission
Output
–
+
Retrans.
–
Rx+
–
Output
–
Rx–
–
Tx+
–
Tx–
–
0V
nd
Retrans. output
=
NC
Normally Closed
=
C
Common
=
NO
Normally Open
T
r e
m
n i
l a
N
u
m
b
r e
3
4
1
0
9
e
e l
t c
o r
d
e
E
r a
h t
P
n i
p
t u
e
e l
t c
o r
d
e
n i
p
t u
2
3
N
L
5
6
Relay 1
Power
Relay 2
Supply
Relay 1
Power
Relay 2
Supply
Relays
Mains Supply
1
–
NC
N
2
–
C
L
Relay 1
3
–
NO
4
–
NC
5
–
C
Relay 2
6
–
NO
Earth (Ground) Stud
(on case) – see Fig. 4.1
5
6
8
7
P
T
1
0
0
3
d r
T
1
0
0
n i
p
t u
e l
a
d
n i
p
t u
–
Neutral
–
Line
– Earth
(Ground)
7
6
P
T
1
0
0
n i
p
t u
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