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Instruction Manual
IB-106-340 Rev. 2.4
April, 2001
7-4 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
22220033
Figure 7-1. Fault 1, Open Thermocouple
a. Fault 1, Open Thermocouple
The HEATER T/C LED flashes once,
pauses for three seconds, and repeats
(Figure 7-1).
1. Check connector J1. Ensure the con-
nector is properly seated.
2. Using a multimeter, measure TP3+ to
TP4-. If the reading is 1.2 VDC ±0.1
VDC, the thermocouple is open.
3. Remove power. Disconnect J1. Meas-
ure continuity across the red and yel-
low thermocouple leads.
4. The measurement should read ap-
proximately 1 ohm.
5. If the thermocouple is open, see para-
graph 6-7, Heater Strut Replacement.