Figure 8-17. Fault 15, Last Calibration Failed - Emerson Rosemount Analytical Oxymitter 4000 Instruction Manual

Hazardous Area Oxymitter 4000
DIAGNOSTIC
ALARMS
CALIBRATION RECOMMENDED
TEST
POINTS
INC INC
HIGH LOW
GAS GAS
DEC DEC
KEYPAD
Alarms
Calib Failed
LOI

Figure 8-17. Fault 15, Last Calibration Failed

Rosemount Analytical Inc. A Division of Emerson Process Management
HEATER T/C
HEATER SW2
O2 CELL
CALIBRATION
J1
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
CAL
TEST GAS +
TP5
PROCESS -
TP6
% O2
37260033
Instruction Manual
o. Fault 15, Last Calibration Failed
Figure 8-17 shows the electronic assembly
for a Hazardous Area Oxymitter 4000 with
a membrane keypad (upper view) and a
Hazardous Area Oxymitter 4000 with an
LOI (lower view).
Membrane Keypad. When Fault 15 is
detected, 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 9-4h, 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.
IB-106-340C Rev. 4.1
July 2004
Troubleshooting 8-19
8