Emerson OXYMITTER 4000 - Manual (Page 123)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-19
Oxymitter 4000
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
37260033
Alarms
Calib Failed
LOI
KEYPAD
Figure 8-17. Fault 15, Last Calibration Failed
o. Fault 15, Last Calibration Failed
Figure 8-17 shows the electronic assembly
for an Oxymitter 4000 with a membrane
keypad (upper view) and an Oxymitter 4000
with an LOI (lower view).
Membrane Keypad. When Fault 15 is de-
tected, the CALIBRATION LED flashes
three times, pauses for three seconds, and
repeats.
1. The last calibration failed alarm acti-
vates when the slope and constant
values calculated are out of range and
the unit reverts to using the previous
calibration values.
2. The cell should be replaced. See para-
graph 9-4i, Cell Replacement, for cell
replacement instructions.
LOI. When Fault 15 is detected, the LOI
displays the “Calib Failed” message. Refer
to the comments in paragraphs 1 and 2
above.