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Manual
00809-0500-4880
Potential cause
O
cell degraded or failed.
2
O
slope error (Slope < 34.5 mV/Dec or > 57.2 mV/Dec).
2
Recommended actions
Check O
operator interface (LOI) (see
menu tree (see
•
•
•
Potential cause
O
constant error (constant not between -20 mV and +20 mV).
2
Recommended actions
Potential cause
COe sensor degraded.
COe slope error (slope not between 200 ppm/Ohm and 4,500 ppm/Ohm).
COe constant error (constant not between -100 Ohms and +100 Ohms.
Recommended action
Replace COe sensor or increase warning level (SYSTEM, CALIB SETUP, or COe
Slope Warn via HART
Potential cause
Low sample gas flow in sensor housing due to flow path plugging.
Recommended action
Check the following portions of the flow path for plugging:
•
•
•
Rosemount OCX8800A
cell impedance by reading the O2 Cell Imped value via the local
2
Figure
5-3).
If cell impedance is zero, replace the O
If cell impedance is less than 5000 Ohms, check for cell housing ground
fault. Repair ground fault.
If cell impedance is greater than 5000 Ohms and no ground fault is
indicated, replace O
cell.
2
1. Flow calibration gas to the O
2. Read the cell millivolt output.
3. Plot the cell millivolt output and the calibration gas O
the chart shown in
4. If the plotted values do not fall on the slope line shown in
replace the O
cell.
2
).
®
Blowback filter
In-situ filter
Eductor outlet path
Figure
4-4) or the O2 Snsr R value via the HART
cell.
2
cell.
2
Figure
9-3.
Troubleshoot
December 2022
®
concentration on
2
Figure
9-3,
229
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