Chemtrac Systems, Inc.
Page 45
SECTION 5.0 TROUBLESHOOTING GUIDES
PROBLEMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
1. Display fluctuates
rapidly and widely
on treated sample.
A. Incomplete dispersion or
mixing of coagulant(s) in
raw water at point of
sampling.
B. Chemical feeders erratic or
partially plugged.
C. Raw water flow-turbidity
fluctuating.
D. GAIN setting too sensitive.
E. Cell bottom plug loose or
O-ring missing.
A. Check stability of readings on
raw or finished water. If stable,
incomplete mixing is the
problem. Move sampling point
further downstream, or resolve
mixing problems.
B. Fix feeders.
C. Check R/W flow controls/charts,
and turbidity.
D. Decrease GAIN setting.
E. Tighten plug. Check O-ring
(See Cleaning Procedures).
2. Display does not
change with
change in
coagulant dosage.
A. GAIN setting too low.
B. Wrong sample point or
insufficient mixing..
C. Sample cell dirty.
D. Excessive “lag time”
between coagulant
injection point and sensor
sample cell.
A. Increase GAIN setting.
B. Select correct sample point.
C. Clean cell (see Cleaning
Procedures).
D. Move sampling point closer to
coagulant feed point and/or
decrease sample TRANSPORT
time (See Selecting Proper
Sample Point).
3. Display indicates
0.00, or closely
thereto, and does
not change with
change in
coagulant dosage.
A. No water sample to sensor.
B. Motor not turning.
C. Dirty or inoperative probe.
D. Opt switch misaligned.
E. Opt switch inoperative.
F. Sensor output connections
incorrect.
G. Circuit card component
faulty.
A. Establish proper sample flow.
B. Turn on motor.
C. Clean or replace probe.
D. Adjust opt switch position for
maximum meter reading on
water sample and tighten
securely in place.
E. Replace opt switch.
F. Check wiring.
G. Replace circuit card.
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