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Instruction Manual
IB-106-340C Rev. 4.1
July 2004
DIAGNOSTIC
ALARMS
CALIBRATION RECOMMENDED
TEST
POINTS
INC
INC
HIGH
LOW
GAS
GAS
DEC
DEC
KEYPAD
Alarms
O2 Cell Open
Figure 8-12. Fault 10, High Cell mV
8-14
Troubleshooting
HEATER T/C
HEATER
SW2
O2 CELL
CALIBRATION
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
CAL
TEST GAS +
TP5
PROCESS -
TP6
% O2
LOI
37260028
Hazardous Area Oxymitter 4000
j.
Fault 10, High Cell mV
Figure 8-12 shows the electronic assembly
for a Hazardous Area Oxymitter 4000 with
a membrane keypad (upper view) and a
Hazardous Area Oxymitter 4000 with an
LOI (lower view). The upper view also
shows J1 and test points TP1 through TP6,
located on the microprocessor board, below
J1
the membrane keypad or the LOI module.
Membrane Keypad. When Fault 10 is
detected, the O2 CELL flashes once,
pauses for three seconds, and repeats.
1. Using a multimeter, measure across
2. One possible cause is connector J1.
3. The platinum pad could also be at fault.
4. Replace heater strut per paragraph
LOI. When Fault 10 is detected, the LOI
displays the "O2 Cell Open" message.
1. Remove power. Unscrew and remove
2. Reconnect power to the Oxymitter
3. Perform the diagnostic steps 1 through
Rosemount Analytical Inc. A Division of Emerson Process Management
TP1+ to TP2-. If you measure 204 mV
to 1 volt DC, the cell reading is due to
high combustibles. This is a self-
clearing alarm, once the combustible
conditions go away. If you measure
1.2 VDC, the cell wires, either orange
or green, have become detached from
the input.
The orange or green wire has come
loose from the crimped connection.
The pad could have broken free from
the back of the cell.
9-4g, Heater Strut Replacement. If
necessary, replace the cell and flange
assembly per paragraph 9-4h, Cell
Replacement.
the LOI module from the electronic
assembly.
4000.
4 shown for the membrane keypad.
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