10
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.
Channel 1
Channel 2
Power
Supply
Retransmission
Relay 1
Relay 2
Serial
Channel 1
Channel 2
Power
Supply
Retrans.
Relay 1
Relay 2
1
2
3
4
5
6
7
+
–
N
L
Serial
(If fitted)
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
–
–
–
–
Braid
White
Black
Conductivity Cell
Temperature Compensator
5
6
7
–
–
–
Brown
Green/Yellow
Blue
1
2
3
4
5
6
–
–
–
–
–
–
Rx+
Rx–
Tx+
Tx–
0V
+
–
Retrans.
Output
Relays
1
2
3
4
5
6
–
–
–
–
–
–
NC
C
NO
NC
C
NO
Relay 1
Relay 2
Mains Supply
N
L
–
–
Neutral
Line
– Earth
(Ground)
Output
RS422/
RS485
Earth (Ground) Stud
(on case) –see Fig. 4.1
Earth (Ground) Stud
(on case) – see Fig. 4.1
NC
C
NO
Normally Closed
Common
Normally Open
=
=
=
2
nd
Retrans. output
4 –ve
5 +ve
Refer to Table 4.1 below
for terminal descriptions
…4
ELECTRICAL CONNECTIONS
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.
Fig. 4.4 Wall-/Pipe-mounted Instrument Connections
e
p
y
T
t
n
e
m
u
r
t
s
n
I
r
e
b
m
u
N
l
a
n
i
m
r
e
T
d
e
t
n
u
o
m
-
l
l
a
W
1
2
3
4
5
6
7
d
e
t
n
u
o
m
-
l
e
n
a
P
2
1
1
1
0
1
9
8
7
6
n
e
e
r
c
s
n
e
v
i
r
D
t
u
p
t
u
o
A
/
N
e
d
o
r
t
c
e
l
e
ll
e
C
t
u
p
n
i
h
t
r
a
E
t
u
p
n
i
e
d
o
r
t
c
e
l
e
t
u
p
n
i
0
0
1
T
P
d
r
3
0
0
1
T
P
t
u
p
n
i
d
a
e
l
t
u
p
n
i
0
0
1
T
P
Table 4.1 Conductivity Cell and Temperature Compensator Terminal Descriptions
Содержание 4623
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