10- Troubleshooting; 12- Maintenance - VWR HIGH PERFORMANCE PIPETTOR User Manual

VWR HIGH PERFORMANCE PIPETTOR
®
10 - TROUBLESHOOTING
A quick inspection of the pipettor may help you to detect a problem.
The following tables may help you to identify and correct the problem you might
encounter.
For any other symptom or if you can't solve the problem, please contact your supplier.
For Single channel models
Symptom
Pipettor is leaking sample
Pipettor won't aspirate
Pipettor is inaccurate
Pipettor is not precise
Tips fall off or do not fit
correctly
Pipetting seize up
14
Possible Cause
Damaged tip-holder
Worn O-ring or seal
Worn O-ring or seal
Damaged tip-holder
Connecting nut is loose
Damaged or corroded piston
Improper repair or assembly
Improper repair or assembly
Unscrewed tip-holder
Connecting nut is loose
Tip-holder is loose
Connecting nut is loose
Incorrect operator technique
Damaged or corroded piston(s)
Damaged tip-holder(s)
Worn O-ring or seal
Low quality tips
Dirty tip-holder
Damaged tip-holder(s)
The tip-ejector is loose
The ejector lock is misaligned
Piston need lubricant
Action
Replace the tip-holder
Replace both parts and lubricate
Replace both parts and lubricate
Replace the tip-holder
Tighten connecting nut
Return pipettor to supplier
See Chapter 12 - Maintenance
See Chapter 12 - Maintenance
Tighten connecting nut
Tighten connecting nut
Tighten connecting nut
Tighten connecting nut
Operator training
Return pipettor to supplier
Replace the tip-holder
Replace both parts and lubricate
Use VWR tips to have optimum fit correctly results of the
pipetting system
Clean the tip-holder with isopropanol or ethanol
Replace the tip-holder
Assemble the tip-ejector properly
Align the ejector lock
Lubricate piston assembly