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3.3 Wall-mounted Instrument Connections – Fig. 3.4
Note. Refer to Fig. 3.1 for Access to Terminals.
Caution. Slacken terminal screws fully before making connections.
1
2
3
Channel 1
Channel 1
D.O. Sensor
1
–
+ve (Red)
3
–
–ve (Black)
Braid
Earth Stud (on
case) – see Fig. 3.1
Warning. The power supply earth (ground) must be connected to ensure safety to personnel, reduction
of the effects of RFI and correct operation of the power supply interference filter.
1
2
3
4
5 6 7
4
5
Channel 2
Serial
(If fitted)
Channel 2
Serial
PT1000
RS422/
Temperature Compensator
RS485
5
–
White
1
6
–
Green
2
Link
3
7
–
4
5
6
Fig. 3.4 Wall-mounted Instrument Connections
3 ELECTRICAL CONNECTIONS...
1
+
–
6
Retrans.
Retransmission
Output
–
+
Retrans.
–
Rx+
–
Output
–
Rx–
–
Tx+
–
Tx–
–
0V
=
NC
Normally Closed
=
C
Common
=
NO
Normally Open
2
3
N
L
4
5
6
Relay 1
Power
Relay 2
Supply
Relay 1
Relay 2
Relays
1
–
NC
2
–
C
Relay 1
3
–
NO
4
–
NC
5
–
C
Relay 2
6
–
NO
Earth Stud (on case) –
see Fig. 3.1
Power
Supply
Mains Supply
N
–
Neutral
L
–
Line
– Earth
9
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