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4.8 Connecting an Oxygen Probe Cable
Connect the probe lead as shown in the following drawings. Unheated probe leads have integral reference
air tube. An adaptor has been supplied to connect this tube to quarter inch flexible PVC tubing, from the air
pump or reference air supply.
Zirconia Sensor
Thermocouple
Note 1:
Numbers in the brackets are connector number if
the probe is to be connected as probe #2
Note 2:
Jumper terminal 4 to 8 if efficiency or flue temperature
display are required.
Use copper wire.
Connection of Probe Cable for Unheated Probes Models 1232.
Zirconia Sensor
Thermocouple
Heater
Note 1: Numbers in the brackets are connector number
if the probe is to be connected as probe #2
Connection of Probe Cable for Heated Probes Model 1231 and 1234.
Technical Manual
22
F
A
Connector mounted on the
probe head, viewed from the
E
B
G
outside of the head
D
C
A
B
E
C
F
A
Connector mounted on the
probe head, viewed from the
B
E
G
outside of the head
C
D
C
B
A
F
D
E
G
6mm tube from reference air supply or
internal pump to Ref Air port on the probe
Orange
Black
Red
Green/Yellow
Green and yellow wires must be
connected to the EARTH screw in
the transmitter
6mm tube from reference air supply or
internal pump to Ref Air port on the probe
Note: Reference air is not supplied to a
Orange
Brown
Black
Blue
White
White
Green/Yellow
Green and yellow wires must be
connected to the EARTH screw in
the transmitter
1 (5) SENS +
2 (6) SENS -
3 (7) TC +
Note 1
4 (8) TC -
1234 sensor
1 (5) SENS +
2 (6) SENS -
3 (7) TC +
Note 1
4 (8) TC -
43 (41) HEATER L
WARNING
44 (42) HEATER N
Mains Power to
Heated Probes
Earth Screw
August 2018
1732 Oxygen Transmitter
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