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Figure 6-11. fault 7, reversed o, Cell -7, Model 3081fg – Emerson 3081FG User Manual

Page 65: Instruction manual

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Instruction Manual

IB-106-3081 Rev. 1.5

September 2002

Rosemount Analytical Inc. A Division of Emerson Process Management

Troubleshooting 6-7

Model 3081FG

%

26020030

Figure 6-11. Fault 7, Reversed O

2

Cell

g. Fault 7, Reversed O

2

Cell

The O

2

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% O

2

).

3. Using a multimeter, measure between

terminals 7(+) and 8(-). If the cell out-
put reading is negative, the O

2

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 O

2

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