3M Troubleshooting Guide for Your Electronic Pipettor

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Troubleshooting

“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, thehas been pressed.

1.Press twice to clear the display and continue working.

See Speed Selection, page 20.

Page 11 of 15 - June 2001

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

ejector tip cone collar

21

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Contents Description 3M Electronic Pipettor 5mL includes PrecautionsIndications Condition Range or Limit Connecting the AC AdapterCharging the Pipettor Battery Instructions For UseProgram Menu Power on Display and StartupMode Selection and Mode Recall Pipettor ProgrammingDilution 5mL Total Volume Dilution 1mL Total Volume Repeat Dispensing 1-5 repetitions of 1mL 1mL Pipetting Open Dilution Programming 5mL PipettingSpeed Selection Frozen Display TroubleshootingEr 1 Display BubblesFilter Replacement Care and MaintenanceCare and Maintenance Cleaning the Tip ConeCalibration Check Chart Battery ReplacementCalibration Check Mode d1, 15, 5mL dilution Tolerances SpecificationsPipettor Tips Accuracy and PrecisionLimitation of Remedies Limited WarrantyOut of Warranty Service