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4.4 Panel-mounted Instrument Connections – Fig. 4.5
✶
Note. Refer to Fig. 4.2 for Access to Terminals.
Caution. Slacken terminal screws fully before making connections.
Retransmission
Output
Normally Closed
Common
Relay 1
Normally Open
Normally Closed
Common
Relay 2
Normally Open
Mains Supply
(Ground)
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. Connect the earth (ground)
lead directly to the case earth (ground) stud and not to the 'E' terminal.
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 9 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.
Earth (Ground)Stud
1
2
3
4
5
6
7
8
9
E
N
L
TBA
+
1
–
2
3
4
5
6
7
8
9
E
Neutral
N
Live
L
Earth
Earth (Ground) Stud
(on case)
Fig. 4.5 Panel-mounted Instrument Connections
4 ELECTRICAL CONNECTIONS...
1
2
3
4
5
6
7
8
9
10
11
12
TBB
1
0V
2
Rx–
Rx+
3
4
Tx–
5
Tx+
6
Blue
7
Green/Yellow
8
Brown
9
Black
White
10
11
12
Braid
Earth (Ground) Stud
(on case)
RS422/RS485
nd
2
Retrans output
Serial Interface
(if fitted)
(If fitted)
4 –ve
5 +ve
Temperature
Refer to
Compensator
Table 4.1
on page 10
for terminal
Conductivity Cell
descriptions
11
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