Figure 8-1. O; Figure 8-15. Fault 13, Invalid Slope - Emerson Oxymitter 4000 Instruction Manual

Oxymitter 4000
DIAGNOSTIC
ALARMS
CALIBRATION RECOMMENDED
TEST
POINTS
INC INC
HIGH LOW
GAS GAS
DEC DEC
KEYPAD
Alarms
O2 Cell Bad

Figure 8-15. Fault 13, Invalid Slope

Rosemount Analytical Inc. A Division of Emerson Process Management
HEATER T/C
HEATER SW2
O2 CELL
CALIBRATION
J1
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
CAL
TEST GAS + TP5
PROCESS -
TP6
% O2
LOI
37260031
m. Fault 13, Invalid Slope
Figure 8-15 shows the electronic assembly
for an Oxymitter 4000 with a membrane
keypad (upper view) and an Oxymitter 4000
with an LOI (lower view).
Membrane Keypad. When Fault 13 is de-
tected, the CALIBRATION LED flashes
once, pauses for three seconds, and re-
peats.
1. During a calibration, the electronics
calculates a slope value. If the value of
the slope is less than 35 mV/deg or
more than 52 mV/deg, the slope alarm
will be active until the end of the purge
cycle.
2. See paragraph 9-2, Calibration. Verify
the calibration by carefully repeating it.
Ensure the calibration gases match the
calibration gas parameters. If you at-
tach a multimeter to TP1+ and TP2-,
sample gas measurements are:
≈ 23 mV
8% O
2
≈ 85 mV
0.4% O
2
3. Power down the Oxymitter 4000 and
remove it from the stack.
4. Replace the cell per paragraph 9-4i,
Cell Replacement.
LOI. When Fault 13 is detected, the LOI
displays the "O2 Cell Bad" message. Refer
to the comments and procedures in para-
graphs 1 through 4 above.
Instruction Manual
IB-106-340 Rev. 3.0
December 2003
Troubleshooting 8-17