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Instruction Manual
IB-106-340 Rev. 2.4
April, 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 7-5
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
22220034
Figure 7-2. Fault 2, Shorted Thermocouple
b. Fault 2, Shorted Thermocouple
The HEATER T/C LED flashes twice,
pauses for three seconds, and repeats
(Figure 5-2).
1. Using a multimeter, measure across
TP3+ and TP4-.
2. If the reading is 0 ±0.5 mV, then a
shorted thermocouple is likely.
3. Remove power and disconnect J1.
4. Measure from TP3+ to TP4-. The
reading should be approximately 20
Kohms.
5. If so, the short is not on the PC board.
See paragraph 6-7, Heater Strut Re-
placement.
7