IB-106-340
5-9
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
22220039
Figure 5-7. Fault 7, Low Heater Temp
g.
Fault 7, Low Heater Temp. The HEATER
LED flashes four times, pauses for three seconds,
and repeats (Figure 5-7).
1. The low heater temperature alarm is active
when the thermocouple reading has dropped
below 28.6 mV.
2. If the thermocouple reading continues to
ramp downward for one minute and does not
return to the temperature set point of ap-
proximately 29.3 mV, then an Open Heater
fault will be displayed.
3. Power down the electronics. Remove the
electronic assembly per paragraph 6-5b,
Electronic Assembly Replacement. Using a
multimeter, measure across the heater con-
nector, J8.
4. If the heater is good, the reading will be
approximately 70 ohms. If the heater is
open, see paragraph 6-7, Heater Strut
Replacement.
Содержание Oxymitter 4000
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