Emerson Rosemount OCX8800A Manual page 219

Manual
00809-0500-4880
Potential cause
Loose or open O
Recommended actions
Potential cause
O cell degraded or failed.
2
Recommended action
Check O
operator interface (LOI) (see
Figure
•
•
•
9.3.2 Ref Current Err
Resistance temperature device (RTD) excitation current error. Reference current
should be 5.02 mA.
Potential cause
Loose or open lead or circuit wire connection for COe sensor or cold junction
connector (CJC) sensor current loop.
Recommended actions
Potential cause
COe sensor grounded.
Recommended actions
Potential cause
COe sensor failed.
Recommended actions
Rosemount OCX8800A
cell circuit connection.
2
1. Check O cell circuit wires for breaks or loose connections.
2
2. Repair lead wire breaks or loose connections.
cell impedance by reading the O2 Cell Imped value via the local
2
5-3).
If cell impedance is zero, replace 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 with cell replacement kit.
2
1. Check all COe and CJC sensor current loop wiring per
Figure 10-9.
2. Correct wiring faults.
1. Check resistance of COe sensor leads to ground per
2. Replace COe sensor if resistance is less than 10M ohms.
1. Check resistance of both COe sensor elements per
Figure 4-4) or the O2 Snsr R value via HART
cell with cell replacement kit.
2
Troubleshoot
December 2022
(see
®
Figure 9-2 and
Figure 10-9.
Figure 10-9.
219