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Instruction Manual
IB-106-340 Rev. 2.4
April, 2001
7-6 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
22220035
Figure 7-3. Fault 3, Reversed Thermocouple
c. Fault 3, Reversed Thermocouple
The HEATER T/C LED flashes three times,
pauses for three seconds, and repeats
(Figure 5-3).
1. Using a multimeter, measure TP3+ to
TP4-.
2. If the reading is negative, the thermo-
couple wiring is reversed.
3. Check red and yellow wires in the J1
connector for the proper placement.
4. If the wiring is correct, the fault is in the
PC board. See paragraph 6-5b, Elec-
tronic Assembly Replacement.