TM 10-4610-232-12
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Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
PORTABLE TURBIDITY METER.
1. Meter does not respond when sample is set into the well.
Step 1.
Check the battery.
If the battery is dead; replace the battery and charge the new battery (para. 4-91).
Step 2.
Check the lamp.
(a) If the lamp is burnt out, replace the lamp and adjust meter (paras. 4-91 and 2-5).
(b) Replace the instrument.
2. Reference adjust knob does not have enough travel to adjust for the reference standard value.
Step 1.
Optics may have aged.
Recalibrate meter (para. 4-91).
Step 2.
Lamp maybe faulty.
Replace lamp and readjust (para. 4-91).
3. Meter will not respond when battery charger is plugged in.
Step 1.
Check charger connection on the meter.
Clean and remove any corrosion.
Step 2.
Check charger adaptor operation.
(a) If the charger is putting out 6 0.2 Vdc, replace the battery (para. 4-91).
(b) If the charger is not putting out the correct voltage, replace the charger adaptor (para. 4-91).
HYPOCHLORITE BACKWASH PUMP.
Hypochlorite backwash pump has low or no discharge flow.
Step 1.
Check strainer in hypochlorite tank.
(a) Clean if dirty.
(b) Replace if plugged (para. 4-38).
Step 2.
Check suction hoses to pump.
(a) If loose, tighten.
(b) If lines are plugged, replace them (para. 4-26).
Step 3.
Check discharge lines from the pump to the injection point.
(a) If the lines are plugged, replace them (para. 4-26).
(b) If the discharge injector is plugged, replace it (para. 4-26).
Step 4.
Check the priming valve above the hypochlorite tank.
(a) Replace the valve if it leaks into the hypochlorite tank (para. 4-40).
(b) Replace the backwash pump (para. 4-37).
HYPOCHLORITE MIXER.
Hypochlorite mixer vibrates excessively.
Step 1.
Check for a loose or bent shaft.
(a) Tighten, if loose (para. 4-39).
(b) Replace shaft if bent (para. 4-39).
Step 2.
Check for loose mixer mounting hardware.
(a) Tighten, if loose.
(b) Replace mixer motor and mounting (para. 4-39).
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