Troubleshooting Guide (Ph) - Emerson Rosemount 1054B Instruction Manual

MODEL 1054B pH/ORP
SYMPTOM
Fault code CAL.
Fault code SHt. pH is a constant
value in any buffer.rES value
less than 70% of normal.
Fault code OId.
E i n increasingly greater or less
than zero mV at 7pH, with
increased poisoning.
pH value locks up (no change
of solutions in buffers).
1054B pH value not the same
as grab sample of process.
Fault code tcH/tcL.
Fault code i n H or i n L .
Fault code SLP.
Fault code SEn.
Fault code EEP.
Fault code CHS.
No alarm relay closure.
No output current.
Low output current.
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TABLE 8-3. Troubleshooting Guide 1054B pH
PROBLEM
1. Warning to calibrate sensor with
buffers. Electrode is aging or coated.
2. Electrode is not in solution.
1. Glass electrode broken.
1. Electrode is worn out or coated.
If electrode is worn out, SLP will also
be low and the electrode sluggish.
2. Electrode is not in solution.
1. Reference becoming poisoned.
1. Glass electrode cracked.
2. Coated glass electrode.
3. Junction plugged.
1. Grab sample incorrect.
2. Unclear what is correct.
3. Analyzer out of calibration.
1. Miswired or temperature
out of range.
2. Open or shorted RTD.
1. Open wire from preamplifier.
2. Bad preamplifier.
3. Defective CPU.
1. Defective electrode.
2. Improper buffer calibration.
3. Coated electrode.
4. Plugged liquid junction.
1. Open wire between sensor
and analyzer .
2. Cable length has been exceeded
Maximum length: 1000 ft. after preamp.
1. Defective EEPROM.
1. Defective CPU.
1. Defective power board.
2. Defective CPU.
1. Defective output board.
2. Miswire.
1. Circuit loading with excessive
resistance on output.
DIAGNOSTICS AND TROUBLESHOOTING
ACTION
1. Calibrate with buffers
(First clean if necessary.).
2. Immerse electrode in solution.
1. Replace electrode.
1. Replace or clean electrode as
soon as possible.
2. Immerse electrode in solution.
1. Replace reference or sensor.
2. Request a special triple junction
sensor if necessary.
1. Replace glass electrode.
2. Clean glass electrode.
3. Replace junction.
1. Re-evaluate sample technique
and equipment.
2. Test with buffer solution.
3. Recalibrate per start-up and
calibration section.
1. Check wiring between the sensor
and analyzer. Check process temp.
2. Replace RTD with new one.
1. Check wiring between
preamplifier and analyzer.
2. Replace preamplifier.
3. Replace CPU PCB.
1. Replace electrode.
2. Recheck buffer accuracies.
3. Clean or replace electrode.
4. Replace junction.
1. Repair wire.
2. Check wiring.
1. Replace CPU PCB.
1. Replace CPU PCB.
1. Replace power PCB.
2. Replace CPU PCB.
1. Replace power PCB.
2. Check for short.
1. Consult output loading limits
1054B pH specifications (600 ohms
max load).
SECTION 8.0