44
8 TROUBLESHOOTING
CHART
NOTES:
1.
Verify that the sample flow to the analyser is a minimum of 150 ml/min at 5 psig minimum (sample
water should be at a level just higher than the overflow weir). Verify constant sample flow through the
analyser by observing flow through the various reservoirs and in the overflow drain.
2.
Verify that the cable on the analyser sample cell is connected to the electronics enclosure and that the
cell motor is operating.
3.
Verify that the reference electrode is in the reference electrode reservoir.
Trouble
Probable Cause
Corrective Action
1. Excessive high output
signal.
a. Airbound sample line.
b. Reference electrode removed from
reservoir.
c. Calibration error
d. Faulty printed circuit board
a. Increase flow momentarily. Gently
tap reference electrode.
b. Replace reference electrode in
reservoir.
c. Check calibration inputs.
d. Consult Factory.
2. Excessive low signal output
or false zero reading.
a. Dirty electrode.
b. Blockage in line inhibiting sample
flow.
c. Faulty printed circuit board.
d. Calibration error.
a. Clean electrode.
b. Clean sample path by back-washing
or chemical cleaning.
c. Consult factory.
d. Recalibrate.
3. Output reacts slowly to
residual change.
a. Coating on measured cell.
b. Excessive suspended solids.
c. Non-representative sample.
a. Clean electrodes.
b. Filter sample.
c. Relocate sample point.
4. Motor operation noisy,
erratic, no motion.
a. Motor wired incorrectly.
b. Misaligned striker has PVC spheres
jammed or worn cell.
c. Faulty motor.
a. Rewire per wiring diagram.
b. Adjust striker assembly.
c. Replace motor.
5. Calibration slope greater
than 60 mA/ppm or less than
10 mA/ppm
a. Coating on measuring cell.
b. Solids in measuring cell.
a. Clean measuring cell.
See section 3.4.
6. Calibration offset greater
than 2 ppm
a. Residual present in sample.
a. See section 3.4.
7. Display blank.
a. Power off.
b. Bad connector or faulty wiring to
display.
c. Faulty display.
a. Turn power switch ON or connect
power.
b. Check for proper plug connection.
c. Replace display.
