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