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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 Bad
Figure 8-16. Fault 14, Invalid Constant
8-18
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
37260032
Hazardous Area Oxymitter 4000
n. Fault 14, Invalid Constant
Figure 8-16 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 14 is
J1
detected, the CALIBRATION LED flashes
twice, pauses for three seconds, and
repeats.
1. After a calibration has been performed,
2. If the cell constant value is outside of
3. Power down the Hazardous Area
4. Replace the cell per paragraph 9-4h,
LOI. When Fault 14 is detected, the LOI
displays the "O2 Cell Bad" message. Refer
to the comments and procedures in para-
graphs 1 through 4 above.
Rosemount Analytical Inc. A Division of Emerson Process Management
the electronics calculates a cell con-
stant value.
the range, -4 mV to 10 mV, the alarm
will activate. See paragraph 9-2, Cali-
bration, and verify the last calibration
was performed correctly.
Oxymitter 4000 and remove it from the
stack.
Cell Replacement.
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