5.19
5.2 DIAGNOSTIC TESTS
The function of these tests is to isolate faults at a lower level than major sub-assemblies.
5.2.1 Oxygen Transducer
The following series of tests assumes that the transducer unit is connected to a close coupled
control/interface unit in which a 01100925B amplifier board is fitted. In systems in which the
transducer is separated from the control/interface unit, refer to circuit diagrams in Figures 2.9 or
2.10 (depending upon Transducer unit fitted) for connection details.
Step Procedure Normal
Indication
Corrective
Action
1
2
3
4
5
6
Remove LED wire from terminal
TB-D-5 on amplifier board.
Measure current from TB-D-5 to
TB-D-4.
Measure current in series TB-D-5
and wire removed from TB-D-5
Refit wire into TB-D-5
Pass nitrogen as a zero gas
through the transducer at a
sample flow rate of 100 to
200ml/min
Remove photo-electric cell wiring
at TB-D-1, 2 and 3, and measure
the output from the photo-electric
cells (Wire connected to TB-D-1 is
negative polarity). Adjust
mechanical zero (see Section 4.3)
to ensure that it is possible to
cause the reading to pass through
zero. Set to 0mV +/- 5mV
50mA+/-4mA
(70mA+/-3mA
upto Serial No.
925/546)
50mA+/-4mA
(70mA+/-3mA
upto Serial No.
925/546)
Replace
Amplifier
Board
01100925B
Replace
LED in
Transducer.
See Section
5.3.2.3.
Replace
photo-cell
LED, or,
oxygen
measuring
cell.
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