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Troubleshooting
Liquid in Tip Cone
If liquid is aspirated beyond the tip cone filter, clean the tip cone as follows.
1. Switch the unit “OFF”.
2. Remove the tip ejector collar: hold down the tip ejector lever and twist off the tip
ejector collar.
3. Unscrew the tip cone from the control handle. Do not rest the pipettor
on the lab bench. Do not touch the stainless steel piston with any foreign objects
to avoid scratching or contamination.
4. Use ethanol and a soft lint-free wipe to gently clean the piston and tip cone.
5. Apply a thin layer of grease to the piston seal.
NOTE: Use only the piston grease specifically recommended by your 3M
representative. Other types of grease can permanently damage the piston.
6. Reassemble the unit and perform a calibration check.
piston
tip cone
tip
ejector
collar
“Er 1” Display
The 3M Electronic Pipettor - 5mL has a
built-in monitoring program to control the
pipettor mechanism. A display showing
“Er1” indicates that the pipettor has been
unable to perform a function properly. Go
through the following procedure to clear
this display and resume pipetting.
1. Allow the pipettor to charge on the stand for a minimum of 15 minutes.
2. Press to clear the error message.
The display should now show the Power “ON” reading. If the error message
remains displayed, consult your 3M representative for additional assistance.
Bubbles
The appearance of many small bubbles on the Petrifilm plate may indicate that the
dispense speed is too fast. Lower the dispense speed (see Speed Selection page 20).
In more viscous samples, a single large bubble may form if the tip is allowed to
contact the sample surface during dispensing. To prevent this, position the tip at least
5mm above the surface during dispensing.
“Frozen” Display
If this display is shown and the pipettor
will not operate, the has been
pressed.
1. Press twice to clear the display
and continue working.
See Speed Selection, page 20.
Troubleshooting
21
Page 11 of 15 - June 2001