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 –
white to 'T/C +'
blue to 'T/C –'
Probe heater –
Live to 1
st
'H' terminal, Neutral to
2
nd
'H' terminal (Polarity
unimportant). Earth to 'E'
Fig. 4.2 Electrical Connections
1
Unlock and remove the
lower panel from the
front of the instrument
– see Fig. 2.1
Remove the two
screws retaining the
terminal shroud and
remove.
2
Fig. 4.1 Access to Terminals
Note. Reference Air
Connection – see Section 4.5.
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
-
+
-
BROWN
BLUE
BRAID
BLUE
WHITE
BLUE
RED
GN/Y
Probe (Power)
1
2
3
4
HEATER
DRIVE
to Probe
(Signal, Power and Air)
CELL
T/C
H H E
+
-
SCR
+
-
BROWN
BLUE
BRAID
BLUE
WHITE
BLUE
RED
GN/Y
Spare
4
A – Twin-conduit Probes
B – Single-conduit Probes
Earth Stud
See
Note
See
Note
