Rosemount Oxymitter 5000 - Page 101

Instruction Manual
IM-106-350C, Rev 2.2
July 2008
8-19
Hazardous Area Oxymitter 5000
Figure 8-15. Fault 13, Invalid Slope
Fault 13, Invalid Slope
Figure 8-15 shows the electronic assembly for a
Hazardous Area Oxymitter 5000 with a
membrane keypad (upper view) and a
Hazardous Area Oxymitter 5000 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% O2 . 23 mV
0.4% O2 . 85 mV
1. Power down the Hazardous Area Oxymitter
5000 and remove it from the stack.
2. 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.
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
38740056
LOI
KEYPAD
Alarms
O2CellBad