7
EN
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INSTRUCTION MANUAL
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VWR
Troubleshooting
Problem
Possible cause
Remedy
Air bubbles appear in dispense
tube
Liquid reservoir is empty
Refill reservoir and prime unit
Too fast filling action
Pump liquid out, refill and dispense slower
Glass barrel is not sealing against
FEP ‘O’ ring
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
Leaking piston
Clean piston. If problem persists, replace piston
assembly (21)
Leaking discharge valve
Clean unit by flushing through - if problem
persists, replace pedestal complete assembly
(20)
Barrel does not fill with liquid
Inlet tube not fitted correctly
Connect inlet tube correctly
Inlet valve stuck
Free inlet valve by inserting a thin rod into the
inlet aperture
Glass barrel is not sealing against the
FEP ‘O’ ring
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
Dispensing not possible
Blocked dispense tube nozzle
Disassemble the dispense tube and flush through
with cleaning fluid
Discharge valve stuck
Clean unit by immersing platform in cleaning
fluid - if problem persists, replace pedestal
complete assembly (20)
Wrong dispense volume
Instrument not calibrated
Calibrate the unit - See page 6 ‘User Calibration’
Leaking valves
Clean platform base - if problem persists, replace
pedestal complete assembly (20)
Liquid appears between glass
barrel and polypropylene
protection sleeve
Glass barrel is not sealing against the
FEP ‘O’ ring
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
Damaged FEP ‘O’ ring
Replace FEP ‘O’ ring
