Figure 8-12. Fault 10, High Cell Mv - Emerson Oxymitter 4000 Instruction Manual

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
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
j. Fault 10, High Cell mV
Figure 8-12 shows the electronic assembly
for an Oxymitter 4000 with a membrane
keypad (upper view) and an 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 the membrane keypad or the LOI
J1
module.
Membrane Keypad. When Fault 10 is de-
tected, the O2 CELL flashes once, pauses
for three seconds, and repeats.
1. Using a multimeter, measure across
2. If you measure 1.2 VDC, the cell wires,
3. One possible cause is connector J1.
4. The platinum pad could also be at fault.
5. 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.
Oxymitter 4000
TP1+ to TP2-.
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.
9-4h, Heater Strut Replacement. If
necessary, replace the cell flange
assembly per paragraph 9-4i, Cell
Replacement.
the LOI module from the electronic as-
sembly.
4000.
5 shown for the membrane keypad.
A Division of Emerson Process Management