Troubleshooting - VWR International DIGITRATE PRO Series Instruction Manual

DIGITRATE PRO

Troubleshooting

Problem
Air bubbles appear in discharge
nozzle
Barrel does not fill with liquid
Titrating not possible
Wrong dispense volume
Liquid appears between glass barrel
and polypropylene protection sleeve
Blank display despite 'ON' status
8
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VWR INSTRUCTION MANUAL
Possible Cause
Liquid reservoir is empty
Too fast filling action
Glass barrel (8) is not sealing against FEP
'O' ring (9)
Leaking piston (7)
Leaking discharge valve
Intake tube not fitted correctly (14)
Inlet valve stuck (11)
Glass barrel (8) is not sealing against the
FEP 'O' ring (9)
Blocked dispense nozzle (12)
Discharge valve stuck (11)
Instrument not calibrated
Backlash not compensated for
Leaking valves (11)
Titrate wheels (1) not turning uniformly
Glass barrel (8) is not sealing against the
FEP 'O' ring (9)
Damaged FEP 'O' ring (9)
Empty battery
Malfunctioning electronics
|
EN
Remedy
Refill reservoir and prime unit
Operate titrate wheels (1) smoothly/slowly
to ensure all air is removed
Unscrew the threaded platform ring (4)
and make sure that the FEP 'O' ring (9) is
properly fitted into its recess
Clean PTFE piston (7). If problem persists,
replace piston
Clean unit by flushing through - if problem
persists, replace platform base (10)
Connect correctly
Free inlet valve (11) by inserting a thin rod
into the inlet aperture and push gently
Unscrew the threaded platform ring (4)
and make sure that the FEP 'O' ring (9) is
properly fitted into its recess
Disassemble the dispense nozzle (12) and
flush through with cleaning fluid
Clean unit by immersing platform in
cleaning fluid - if problem persists, replace
platform base (10)
Calibrate the unit
Compensate for backlash
Clean platform base (10) - if problem
persists, replace
Operate titrate wheels (1) slowly
Unscrew the threaded platform (4) ring
and make sure that the FEP 'O' ring (9)
is properly fitted into its recess, slightly
stretching the 'O' ring with your fingertips
may assist this
Replace FEP 'O' ring (9)
Send unit for battery replacement
Send unit for repair