6 troubleshooting, 1 error search, Troubleshooting 6.1 – Eppendorf Maxipettor 4720 User Manual
Page 14: Error search
![background image](/manuals/551338/14/background.png)
New set value =
Weight of pipetted liquid
Density of pipetted liquid
2 x nominal value –
Troubleshooting
Varipette
®
4720
English (EN)
14
of the pipetted liquid, divide the weight by the density of the water. Number of
determinations: 10
Due to its degree of incorrectness, you cannot use the Maxitip for testing the Varipette.
If you wish to dispense liquids with specific properties, you can set the Varipette to
gravimetric instead of volumetric. In this mode, the volume pipetted at the nominal value
is weighed.
Check the determined value gravimetrically and correct it, if necessary.
6
Troubleshooting
6.1
Error search
Error Cause Remedy
Pipetting lever cannot be
pressed down completely.
Clamping lever is not fully
pressed down.
Properly insert the piston,
completely press down
the clamping lever.
Piston cannot be controlled
via the pipetting lever.
Pipetting lever is not pressed
down up to the stop.
Push down the pipetting
lever all the way up to the
stop.
Incorrect dispensing volume. Pipetting lever not fully
pressed down during liquid
aspiration.
Always press down the
pipetting lever up to the
lower stop; the lower stop
varies with the dispensing
volume.
Clamping lever is not fully
pressed down.
Properly insert the piston,
completely press down
the clamping lever.
Liquid with deviating
density, high vapor pressure.
volum./grav. check
Varitip drips.
Piston does not seal.
Exchange Varitip.
Maxitip not firmly fit onto the
dispensing unit.
Plug in long tip.
Liquid with high steam
pressure/low viscosity.
Insert valve into the
Maxitip.
Droplets in the tip of the
Maxitip.
Increased wetting of the
plastic.
Exchange Maxitip.