Troubleshooting, Care And Maintenance; Error" Display; Bubbles On Plate; Liquid In Tip Cone/Greasing The Piston - 3M Pipettor II Manual De Instrucciones

(English)

7. TRoUbLEsHooTInG, CaRE anD MaInTEnanCE

7.1 "Error" Display

The 3M Electronic Pipettor II - 5 mL has a built-in monitoring program to control the pipettor mechanism. A display showing "Error" then "Press Ent."
message 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 or through the transformer for a minimum 30 minutes.
2. Press to clear the error message. The display will show "reset" and "press tip" messages.
3. Reset the pipettor by pressing either of the tip ejector buttons .

7.2. Bubbles on Plate

The appearance of many small bubbles on the 3M Petrifilm Plate may indicate that the dispense speed is too fast. Lower the dispense speed (see
Speed Selection, Section 6.11).
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 5 mm above the surface during dispensing.

7.3. Liquid in Tip Cone/Greasing the Piston

If liquid is aspirated beyond the tip cone filter, clean the tip cone as follows:
Disassembling:
1
2
4 3
1. Remove the battery pack (1).
2. Unscrew the tip ejector collar (2) counter-clockwise and remove it.
3. Unscrew the black tip ejector assembly (3) counter-clockwise and remove it.
4. Unscrew the exposed piston (4) counter-clockwise and remove it.
5. Moisten a soft, lint-free wipe with 70% ethanol and gently clean the tip cone. The interior of the tip ejector collar can be cleaned with a cotton swab.
6. Let the parts dry.
7. Apply a thin layer of grease to the surface of the piston (4) on the black seal at the lower part of the piston.
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