Emerson Oxymitter 5000 Instruction Manual page 109

Instruction Manual
IM-106-350, Rev 2.2
July 2008
Figure 8-11. Fault 9, High Heater Temp
DIAGNOSTIC
ALARMS
CALIBRATION RECOMMENDED
TEST
POINTS
INC
HIGH
GAS
DEC
Alarms
O2 Temp Hi
HEATER T/C
HEATER
SW2
O2 CELL
CALIBRATION
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
INC
CAL
LOW
GAS
TEST GAS +
TP5
DEC
PROCESS -
TP6
% O2
KEYPAD
LOI
Fault 9, High Heater Temp
Figure 8-11 shows the electronic assembly for an
Oxymitter 5000 with a membrane keypad (upper
view) and an 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.
J1
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.
Oxymitter 5000
8-15