IB-106-340
5-3
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATER T/C +
HEATER T/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 5-1. Fault 1, Open Thermocouple
a.
Fault 1, Open Thermocouple. The HEATER
T/C LED flashes once, pauses for three seconds,
and repeats (Figure 5-1).
1. Check connector J1. Ensure the connector 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. Measure
continuity across the red and yellow thermo-
couple leads.
4. The measurement should read approxi-
mately 1 ohm.
5. If the thermocouple is open, see
paragraph 6-7, Heater Strut Replacement.
Содержание Oxymitter 4000
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