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Instruction Manual
IB-106-340 Rev. 2.4
April, 2001
7-8 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
22220036
Figure 7-5. Fault 5, Open Heater
e. Fault 5, Open Heater
The HEATER LED flashes once, pauses for
three seconds, and repeats (Figure 7-5).
1. Remove power. Remove the electronic
assembly per paragraph 6-5b, Elec-
tronic Assembly Replacement.
2. Using a multimeter, measure across
the heater connector J8.
3. The measurement should be approxi-
mately 72 ohms. If the heater is open,
see paragraph 6-7, Heater Strut
Replacement.