Emerson Process Management OXYMITTER 4000 - Manual (Page 111)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-15
Hazardous Area Oxymitter 4000
Alarms
O2 Cell Bad
LOI
KEYPAD
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATER T/C +
HEATER T/C -
INC INC
DEC DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% O2
SW2
TP1
J1
TP2
TP3
RED YEL GRN ORG
TP4
TP5
TP6
ON
37260029
Figure 8-13. Fault 11, Bad Cell
k. Fault 11, Bad Cell
Figure 8-13 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).
Membrane Keypad. When Fault 11 is
detected, the O2 CELL flashes three times,
pauses for three seconds, and repeats.
1. The bad cell alarm activates when the
cell exceeds the maximum resistance
value.
2. The cell should be replaced. See para-
graph 9-4h, Cell Replacement, for cell
replacement instructions.
LOI. When Fault 11 is detected, the LOI
displays the “O2 Cell Bad” message. Refer
to the comments and procedures in para-
graphs 1 and 2 above.
8