Liquid Controls MA4 Meter - Manual (Page 26)

26
Troubleshooting
! ! ! ! ! WARNING
All internal pressures must be relieved before disassembly or inspection of the strainer, air eliminator, any valves in
the system, the packing gland, and the front or rear covers. See “Relieving Internal Pressure” (Page 10).
PROBLEM: Leakage from the cover seal.
PROBABLE CAUSE AND SOLUTION:
Seal has been damaged due to shock pressure or cover bolts have not been tightened sufficiently. Replace seal
and/or re-torque cover bolts.
PROBLEM: Product flows through meter but the register does not operate.
PROBABLE CAUSE AND SOLUTION:
A
Check the pulse output device, and gear train. Replace components if required.
B If all meter parts are moving, the problem is in the encoder. The faulty encoder should be checked and repaired by
trained technician.
PROBLEM: Breaking teeth on timing gears.
PROBABLE CAUSE AND SOLUTION:
A
Starting or stopping flow in meter too rapidly. Replace the damaged components. Correct the system operational
practices.
B Pump bypass not adjusted properly. Readjust as necessary.
PROBLEM: Product flows through meter but register does not record properly.
PROBABLE CAUSE AND SOLUTION:
A
SCAMP™ is not properly calibrated. Refer to SCAMP™ manual (Bulletin #500184) supplied with meter.
B The vapor release valve is sticking, allowing vapor to pass through meter. Inspect and repair as required.
C The differential valve diaphragm is leaking. Replace the diaphragm.
PROBLEM: No flow through meter.
PROBABLE CAUSE AND SOLUTION:
A
Faulty or non-functioning pump.
B The valve is not open or not functioning.
C The meter is “frozen” due to build up of chemical “salts” or foreign material inside metering chamber. To correct,
clean the meter and inspect for damage.
D The vapor vent line valve is shut or there may be an obstruction in vapor vent line between differential valve and
vapor space in tank.
E Blocked strainer.
PROBLEM: Meter runs too slowly.
PROBABLE CAUSE AND SOLUTION:
A
The valve’s internal mechanism is faulty. The valve does not open fully.
B The meter gears or rotors are “salted” enough to slow up rotation parts. To correct, clean the meter.