7
4
CONNECTIONS…
4.2.2
Access to Terminals – Fig. 4.1
4.2.3
Connections – Fig. 4.2
1
Mains:
Live to ‘L’
Neutral to ‘N’
Earth to ‘E’
2
Retransmission Output (4 to 20mA):
Positive to ‘RTX +’
Negative to ‘RTX –’
3
Relay outputs 1 and 2
‘N/C’ – normally closed
‘C’ – common
‘N/O’ – normally open
4
Secure the probe conduit fitting in the appropriate gland
and make the following connections:
Cell output –
red to ‘CELL +’
blue to ‘CELL –’
screen to ‘CELL SCR’
Thermocouple –
see Table 4.2
1
Unlock and remove the
lower panel from the
front of the instrument
– see Fig. 3.1
Undo the two retaining
screws and remove the
terminal shroud.
2
Note. Cable core colour is dependent on cable type – see Table 4.2
Fig. 4.2 Electrical Connections
N/C
N/O N/C
N/O
E
MAINS
RELAY
1
RELAY
2
RTX
HEATER
DRIVE
Probe (Signal)
Retransmission
Relays
Incoming
Power Supplies
CELL
T/C
N L
C
C
+
H H E
+
-
SCR
-
+
-
BRAID
BLUE
RED
Spare
1
2
3
4
Not Used
Earth Stud
Caution.
Both front panels are held in position by the front
panel screws only and are not otherwise captive.
When removing the panels, ensure they are
adequately supported.
Fig. 4.1 Access to Terminals
