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OSMOMAT 050 User Guide
Version 1.1 (2011-10-12)
4.5 Preparing the Filter Paper and Degassing the Solvent
A piece of filter paper must be placed below the semipermeable membrane to act as a leveling disk for
the membranes recommended by us. This filter paper increases the small thickness of the membranes
from 0.10 to 0.15 mm to an overall thickness of 0.3 mm and creates the correct bonding pressure
when screwing together the measuring cell.
The filter paper is not required when using membranes with a thickness of 0.3 mm.
It is supplied by us along with the membranes and acts as a separating layer between the mem-
branes.
The filter paper must be degassed before use in the measuring cell.
Degassing the filter paper requires a lot of care because all air bubbles must be removed from the
paper. It is recommended to degase use to degas the filter paper together with the Ringer's solution
with the 30 mL syringe
(see chapter 4.2)
Pull the plunger out of the syringe, place the filter paper in the syringe cylinder, and reinsert the plung-
er. Do not fold the filter paper. Next, aspirate approx. 15 mL of Ringer's solution into the syringe, re-
move the air from the syringe, and clamp shut the aspiration tube using the tube clamp. By pulling the
plunger firmly, a vacuum is created, which causes steam bubbles to form and removes the remaining
air from the filter paper texture. The filter paper may remain inside the syringe together with the Ring-
er's solution until used in the measuring cell.
Figure 4-5: Syringe with Ringer's solution and filter paper
Summary of Contents for OSMOMAT 050
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