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4.9 Connecting a 1234 Sensor Cable
The 1234 will either be supplied with a weather proof connector or direct cable wiring.
If the 1234 has a weather proof connector, it will have been supplied with a cable that is already terminated
with a matching plug. The other end of the cable can then be terminated in the 1732 transmitter as shown in
the 1231 / 1234 wiring diagram on the previous page
If the 1234 has been supplied without the weather proof connector, remove the cover of the 1234 and
connect the wires to the connectors on the circuit board as shown below.
4.10 Connecting the Auxiliary Thermocouple (optional)
For 1231 heated probes, the auxiliary thermocouple must be a separate TC with the junction isolated from
earth, mounted near to and upstream of the oxygen probe. It can be either a K, J, R or S type thermocouple.
It is optional. If the auxiliary temperature or combustion efficiency is not to be displayed or transmitted, then
an auxiliary thermocouple is not necessary.
The thermocouple should be connected to terminals 7 & 8. These terminals will not be available for an
auxiliary thermocouple if a second probe has been installed.
4.11 Connecting the Output Channels
The two active-powered 4-20mA DC output channels are capable of driving into a 1000 load. The output
terminals are 12 & 13 for channel 1, and 14 & 15 for channel 2.
4.12 Connecting the Alarms
A common alarm, which should be connected for all installations initiates on alarm functions described
below. Three additional alarm relays are available for selectable functions as listed in chapter 9.3 Selectable
Process Alarms. Each relay has normally open contacts. The contacts will open in alarm condition. Relays
are connected as follows:
Relay
Common Alarm
Alarm 1
Alarm 2
Alarm 3
Common Alarms
Probe 1 / Probe 2 Heater Fail
Probe 1 / Probe 2 High Impedance
Probe 1 / Probe 2 TC Open Circuit
Aux TC Open Circuit
Ref Air Pump Fail
Ref Air Pump Overload
BBRAM Fail
August 2018
1732 Oxygen Transmitter
OXYGEN
SENSOR
TYPE K THERMOCOUPLE
HEATER 110VAC 100 WATTS
Connecting a 1234 Sensor Cable
Terminal Numbers
26 & 27
28 & 29
30 & 31
32 & 33
All of the following conditions will cause a common alarm -
+
C
ORANGE
-
B
BROWN
+
A
BLACK
-
F
BLUE
+
D
WHITE
-
E
WHITE
Alarm Log Fail
ADC Calibration Fail
Output 1 / Output 2 Failure
Heater 1 / Heater 2 SSR Failure
Heater SSR Leakage
Probe 1 / Probe 2 Filter Blocked
Gas 1 / Gas 2 Calibration Error
Technical Manual
23
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