Instruction Manual
IB-106-340C Rev. 4.1
July 2004
8-16 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
AlarmsO2 Cell Bad

LOI

KEYPAD

DIAGNOSTIC
ALARMS
TEST
POINTS
HEATERT/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATERT/C +
HEATERT/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 8-14. Fault 12, EEprom Corrupt
l. Fault 12, EEprom Corrupt
Figure 8-14 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 12 is
detected, the O2 CELL LED flashes four
times, pauses for three seconds, and
repeats.
1. T his alarm can occur if the EEprom is
changed for a later version. At power
up, the EEprom is not updated.
2. T o correct this problem, power down
and then restore power. The alarm
should clear.
3. If the alarm occurs while the unit is
running, there is a hardware problem
on the microprocessor board.
4. If cycling the power does not clear the
alarm, see paragraph 9-4c, Electronic
Assembly Replacement.
LOI. When Fault 12 is detected, the LOI
displays the “EEprom Corrupt” message.
Refer to the comments and procedures in
paragraphs 1 through 4 above.