Emerson 3081FG instruction manual Fault 7, Reversed O2 Cell

Model 3081FG

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

g. Fault 7, Reversed O2 Cell

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26020030

Figure 6-11. Fault 7, Reversed O2 Cell

The O2 cell connections are reversed. The fault displays as shown in Figure 6-11.

1.Refer to Figure 6-4.Check the black (to terminal 7) and white (to terminal 8) wires for the proper placement. Rewire if necessary.

2.Apply the low calibration check gas (0.4% O2).

3.Using a multimeter, measure between terminals 7(+) and 8(-). If the cell out- put reading is negative, the O2 cell wiring is reversed.

4.If the wiring is correct, check if the mul- timeter reading is the same as the reading shown on the O2 CELL mV di- agnostics screen (see Section 3,

STARTUP AND OPERATION).

5.If the reading is different, the transmit- ter electronics are faulty. Replace the PC board stack assembly per para-

graph 5-2. 6

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 6-7