Emerson Process Management OXYMITTER 4000 IM-106-340 - Manual (Page 107)

Instruction Manual
IM-106-340, Rev. 4.0
May 2006
8-15
Oxymitter 4000
Figure 8-11. Fault 9, High Heater Temp
Fault 9, High Heater Temp
Figure 8-11 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 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. The 4-20 mA signal returns to the default
value (4 or 20 mA).
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.
37260027 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
Alarms
O2 Temp Hi