Bio-Rad Rotofor® and Mini Rotofor Cells - Manual (Page 30)

Section 10
Maintenance Guide
10.1 Vent Buttons
The vent buttons should last four or five runs. They should be inspected before
use for tears in the fabric. If there are any tears, or if leaking occurs during the run,
replace the vent buttons (catalog number 170-2957). Leaking may be due to
overfilling the electrode assemblies. Make sure the assemblies are not filled more
than 65% full. Air space is needed above the electrolyte to allow gas to escape
through the buttons. If the air space is insufficient, pressure may build up and
cause leaking.
10.2 O-rings
The O-rings in the electrode assemblies should be inspected after the first
20–30 runs. If there are any signs of wear, replace them using the O-rings supplied
in the Repair Kit (catalog number 170-2953). If the O-rings are unworn after the
first 20 runs, check them every five runs after that until they need to be replaced.
10.3 Cooling Finger O-rings
Inspect the cooling finger O-rings every 200 runs or every year, which ever
comes first. If there are signs of wear, replace them using the O-rings supplied in
the Cooling Finger O-ring Kit (catalog number 170-2954).
10.4 Membrane Core
The membrane core does not have a replacement schedule. It should be
inspected after each run. If it becomes deformed (through overheating or mechani-
cal stress), it should be replaced.
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