Rosemount Oxymitter 5000 - Page 97

Instruction Manual
IM-106-350C, Rev 2.2
July 2008
8-15
Hazardous Area Oxymitter 5000
Figure 8-11. Fault 9, High Heater Temp
Fault 9, High Heater Temp
Figure 8-11 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 9 is detected, the HEATER LED
flashes five times, pauses for three seconds, and
repeats.
1. If the thermocouple produces a voltage in
excess of approximately 30.7 mV, the high
heater temp alarm activates.
2. An alarm is sent via fieldbus.
3. This alarm is self-clearing. When
temperature control is restored and the
thermocouple voltage returns to the normal
range, the alarm clears.
4. If the temperature continues to rise, the
next alarm will be the high high heater
temp alarm.
LOI
When Fault 9 is detected, the LOI displays the
"O2 Temp Hi" message. Refer to the comments
and procedures in paragraphs 1 through 4
above.
LOI
KEYPAD
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
38740052
Alarms
O2TempHi