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Instruction Manual
IB-106-340 Rev. 2.4
April, 2001
7-10 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
Oxymitter 4000
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATERT/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATERT/C +
HEATERT/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
22220038
Figure 7-7. Fault 7, High Case Temp
g. Fault 7, High Case Temp
The HEATER LED flashes three times,
pauses for three seconds, and repeats
(Figure 7-7).
1. If the case temperature exceeds 185°F
(85°C), 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 Oxymitter 4000 is installed
exceeds the ambient temperature re-
quirements 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 Oxymitter 4000
flange may eliminate this problem.
4. If a spool piece does not solve the
problem, relocation is the only solution.