Troubleshooting - VWR ZIPPETTE PRO Manual De Instrucciones

ZIPPETTE PRO

Troubleshooting

Problem
Air bubbles appear in dispense tube
Barrel does not fill with liquid
Dispensing not possible
Wrong dispense volume
Liquid appears between glass barrel
and polypropylene protection sleeve
8
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VWR INSTRUCTION MANUAL
Possible
Liquid reservoir is empty
Too fast filling action
Glass barrel is not sealing against
FEP 'O' ring
Leaking piston
Leaking discharge valve
Inlet tube not fitted correctly
Inlet valve stuck
Glass barrel is not sealing against
the FEP 'O' ring
Blocked dispense tube nozzle
Discharge valve stuck
Instrument not calibrated
Leaking valves
Glass barrel is not sealing against
the FEP 'O' ring
Damaged FEP 'O' ring
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EN
Remedy
Refill reservoir and prime unit
Pump liquid out, refill and dispense slower
Unscrew the threaded platform ring and make
sure that the FEP 'O' ring is properly fitted into its
recess, if necessary stretch 'O' ring slightly using
fingertips
Clean piston. If problem persists, replace piston
assembly (Drawing 13)
Clean unit by flushing through - if problem
persists, replace pedestal complete assembly
(Drawings 16 & 17)
Connect inlet tube correctly
Free inlet valve by inserting a thin rod into the
inlet aperture
Unscrew the threaded platform ring and make
sure that the FEP 'O' ring is properly fitted into its
recess, if necessary stretch 'O' ring slightly using
fingertips
Disassemble the dispense tube and flush through
with cleaning fluid
Clean unit by immersing platform in cleaning
fluid - if problem persists, replace pedestal
complete assembly (Drawings 16 & 17)
Calibrate the unit - See page 5 'User Calibration'
Clean platform base - if problem persists, replace
pedestal complete assembly (Drawings 16 & 17)
Unscrew the threaded platform ring and make
sure that the FEP 'O' ring is properly fitted into its
recess if necessary stretch 'O' ring slightly using
fingertips
Replace FEP 'O' ring