Emerson Process Management OXYMITTER 4000 IM-106-340 - Manual (Page 111)

Instruction Manual
IM-106-340, Rev. 4.0
May 2006
8-19
Oxymitter 4000
Figure 8-15. Fault 13, Invalid Slope
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 detected, the CALIBRATION
LED flashes once, pauses for three seconds,
and repeats.
1. During a calibration, the electronics
calculates a slope value. If the value of the
slope is less than 35 mV/dec or more than
52 mV/dec, the slope alarm will be active
until the end of the purge cycle.
2. See "Calibration with Keypad" in Section 9:
Maintenance and Service. Verify the
calibration by carefully repeating it. Ensure
the calibration gases match the calibration
gas parameters. If you attach a multimeter
to TP1+ and TP2-, sample gas
measurements are:
8% O
2
. 23 mV
0.4% O
2
. 85 mV
3. Power down the Oxymitter 4000 and
remove it from the stack.
4. Replace the cell per "Cell Replacement" in
Section 9: Maintenance and Service.
LOI
When Fault 13 is detected, the LOI displays the
"O2 Cell Bad" message. Refer to the comments
and procedures in paragraphs 1 through 4
above.
37260031
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
LOI
KEYPAD
Alarms
O2 Cell Bad