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Cause
●
Faulty wiring or breakage.
●
Lowered voltage.
●
Damage to electronic circuit of control
unit.
●
Air sucked in from suction piping.
●
Valve gasket not installed.
●
Valve set fitting in wrong direction.
●
Pump is air-locked.
●
Pump stroke length is too short.
●
Suction or discharge side valve clogged
with foreign matter.
●
Adhesion of valve onto valve seat.
●
Suction or discharge side valve clogged
with foreign matter.
●
Air trapped in pump.
●
Overfeeding.
●
Diaphragm out of order or damaged.
●
Valve CS or fitting insufficently tightened.
●
Pump head in sufficiently tightened.
●
Diaphragm is damaged.
●
O ring and valve gasket not installed.
●
Power supply cord is routed in a wrong
way.
●
Stained electrode.
●
Scratch, crack, deterioration on electrode.
2. Causes of Trouble and Troubleshooting
Trouble
Pump does not start.
No liquid flow.
Discharge fluctuates.
Liquid leaks.
Measured value fluctuates
considerably.
Measuring response is extremely
poor.
Troubleshooting
K
Correct wiring.
K
Find cause and raise voltage
to rated level.
K
Replace electronic circuit.
K
Rectify piping.
K
Install it.
K
Reassemble it.
K
Bleed air.
K
Drive pump with 100%
stroke length. Then reset
stroke length.
K
Disassemble, inspect, and
clean.
K
Disassemble, inspect, and
clean.
K
Disassemble, inspect, and
clean.
K
Bleed air.
K
Install check valve.
K
Replace it.
K
Tighten it.
K
Tighten it. Clamping torque:
2.16 N·m {22 kgf·cm}.
K
Replace it.
K
Install them.
K
Change cord routing.
K
Clean electrode.
K
Replace electrode.
