ATI
Q45D-ODO Optical D.O. System
Part 9– Troubleshooting
O & M Manual
Revision C (7/09)
64 -
3. Disconnect the five sensor wires from the oxygen monitor. Those wires are
color coded red, white, blue, green, brown, and black. Connect the DVM
between the brown and black wires. These are the RTD leads, and you
should find a resistance value that depends on the temperature. The table
below lists the resistance values for various temperatures. Reading
resistance between the red and green wires should give exactly the same
values as between red and black.
Temperature
°C
Resistance
Ω
0
1000
5
1019
10
1039
15
1058
20
1078
25
1097
30
1117
35
1136
40
1155
45
1175
50
1194
Figure 9-2 Pt1000 RTD Table
If you suspect that water has gotten into a cable connection or into
the plug connection of a submersible sensor, disconnect the cable
and allow the parts of the sensor to sit in a warm place for 24
hours. If water in the connector is the problem, it should dry out
sufficiently to allow normal sensor operation.
