Emerson Rosemount OCX 8800 - Page 112

Descriptions of PlantWeb AlertsTable 7-3:
Alerts Alarms AMS tab
What does the
alert indicate?
Recommended
action Description
Sensor Malfunc-
tion
Transducer block:
1. O
2
Cell Open
2. Comb Cell Er-
ror
Sensor Alerts This alert is active
when the sensor
is indicating a very
high or unexpec-
ted output.
Check sensor
wires for loose or
broken connec-
tions or replace
the cell.
1. The oxygen
cell interface
is designed to
indicate a very
high output if
the cell be-
comes discon-
nected from
the electron-
ics. It is possi-
ble that a wire
connection to
the cell, either
in the probe
tip or at the
electronics, is
loose or bro-
ken. The cell
may also be
damaged
from mechan-
ical stress. In
extreme ca-
ses, a very low
oxygen con-
centration in
the process
may cause
this alarm. Di-
agnosis must
be done at the
analyzer. Re-
fer to
Section 8.2 for
details.
2. This problem
could be
caused by a
mechanical
failure in the
sensor hous-
ing or at the
electronics.
An open cir-
cuit in the
combustible
sensor could
Foundation Fieldbus
102 OCX 8800