Rosemount Oxymitter 5000 - Page 95

Instruction Manual
IM-106-350C, Rev 2.2
July 2008
8-13
Hazardous Area Oxymitter 5000
Figure 8-9. Fault 7, High Case Temp
Fault 7, High Case Temp
Figure 8-9 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 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 a fieldbus alarm will be sent.
2. This signifies that the environment where
the Hazardous Area Oxymitter 5000 is
installed exceeds the ambient temperature
requirements or that heat due to convec-
tion is causing case temperature to rise
above the limit.
3. Placing a spool piece between the stack
flange and the Hazardous Area Oxymitter
5000 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.
LOI
KEYPAD
Alarms
BoardTempHi
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
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