Millipore 8003 - Troubleshooting

23Stirred Ultraltration Cells
Troubleshooting
Symptom: Little or No Filtrate Obtained
Rotate the pressure-relief valve knob to check for ■
pressure. If the cell is not pressurized, check the
nitrogen source and regulator.
Make sure the glossy side of the disc membrane faces ■
up.
If the sample solution is highly viscous, due to microso- ■
lutes, either dilute or dialter to increase ow rate.
Check the membrane holder and ltrate port for ■
blockage.
Symptom: Filtration Rate Abnormally High
Check the membrane for lesions, scratches and rough- ■
ness.
Make sure that the correct membrane type is being used. ■
Make sure cell is pressurized ■ prior to placing onto
magnetic stirring table.
Check the stirrer assembly to ensure that the stirring ■
bar is not contacting the membrane surface.
Symptom: Cell Leaks
Be sure that the lower O-ring rests entirely on the ■
peripheral surface of the membrane.
Check the O-rings for nicks or cuts. ■
Make sure that the membrane support is seated ■
properly, and that the base is screwed in rmly.
Make sure that the O-rings have not been not squeezed ■
out of their slots.
Check the ttings on the gas inlet tubing for correct ■
order and position. See the Gas Pressure Line
Installation section of this user guide.
99228_RevM.indd 23 8/7/2008 3:10:18 PM