Figure 8-8. Fault 6, High High Heater Temp - Emerson Rosemount Analytical Oxymitter 4000 Instruction Manual

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
DIAGNOSTIC
ALARMS
CALIBRATION RECOMMENDED
TEST
POINTS
INC INC
HIGH LOW
GAS GAS
DEC DEC
KEYPAD
Alarms
Very Hi O2 Temp

Figure 8-8. Fault 6, High High Heater Temp

8-10 Troubleshooting
HEATER T/C
HEATER SW2
O2 CELL
CALIBRATION
J1
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
CAL
TEST GAS +
TP5
PROCESS -
TP6
% O2
LOI
37260024
Hazardous Area Oxymitter 4000
f. Fault 6, High High Heater Temp
Figure 8-8 shows the electronic assembly
for a Hazardous Area Oxymitter 4000 with
a membrane keypad (upper view) and a
Hazardous Area Oxymitter 4000 with an
LOI (lower view).
Membrane Keypad. When Fault 6 is
detected, the HEATER LED flashes twice,
pauses for three seconds, and repeats.
1. The high high heater temp alarm will
activate when the thermocouple pro-
duces a voltage of 37.1 mV
[900°C (1652°F)].
2. The triac and the temperature control
may be at fault.
3. Remove power. Allow Hazardous Area
Oxymitter 4000 to cool for five minutes.
Restore power.
4. If the condition repeats, replace the
electronic assembly per paragraph
9-4c.1, Electronic Assembly
Replacement.
LOI. When Fault 6 is detected, the LOI
displays the "Very Hi O2 Temp" message.
1. The very high O
will activate when the thermocouple
produces a voltage of 37.1 mV
[900°C (1652°F)].
2. The triac and the temperature control
may be at fault.
3. Remove power. Allow the Oxymitter
4000 to cool for five minutes. Restore
power.
4. If the condition repeats, replace the
electronic assembly per paragraph
9-4c, Electronic Assembly Replace-
ment.
Rosemount Analytical Inc. A Division of Emerson Process Management
temperature alarm
2