Figure 8-9. Fault 7, High Case Temp - Emerson Rosemount Analytical Oxymitter 4000 Instruction Manual

Hazardous Area Oxymitter 4000
DIAGNOSTIC
ALARMS
CALIBRATION
CALIBRATION RECOMMENDED
TEST
POINTS
INC INC
HIGH LOW
GAS GAS
DEC DEC
KEYPAD
Alarms
Board Temp Hi
LOI

Figure 8-9. Fault 7, High Case Temp

Rosemount Analytical Inc. A Division of Emerson Process Management
HEATER T/C
HEATER SW2
O2 CELL
J1
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
CAL
TEST GAS + TP5
PROCESS - TP6
% O2
37260025
Instruction Manual
g. Fault 7, High Case Temp
Figure 8-9 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 7 is
detected, The HEATER LED flashes three
times, pauses for three seconds, and
repeats.
1. If the case temperature exceeds 85°C
(185°F), the temperature control will
shut off and the 4-20 mA signal output
will go to the default value.
2. This signifies that the environment
where the Hazardous Area Oxymitter
4000 is installed exceeds the ambient
temperature requirements or that heat
due to convection is causing case tem-
perature to rise above the limit.
3. Placing a spool piece between the
stack flange and the Hazardous Area
Oxymitter 4000 flange may eliminate
this problem.
4. If a spool piece does not solve the
problem, relocation is the only solution.
LOI. When Fault 7 is detected, the LOI
displays the "Board Temp Hi" message.
Refer to the comments in paragraphs 1
through 4 above.
IB-106-340C Rev. 4.1
July 2004
Troubleshooting 8-11
8