Gonotec OSMOMAT 050, User Manual

Page: 23 / 51

OSMOMAT 050 User Guide Page 23 of 51
Version 1.1 (2011-10-12)
The purpose of this cleaning procedure is to free the entire bottom of the measuring cell as well as the
bore and the area above the pressure transducer from tiny adhering air bubbles. Air bubbles in the
measurement system prolong the measuring time and falsify the measurement result.
4.8 Screwing Together the Measuring cell
Add degassed Ringer's solution up to the rim of the cleaned and deaerated lower half of the measur-
ing cell. Install the O ring (26 mm). Next, remove the degassed filter paper from the 30 mL syringe and
place it at the bottom of the measuring cell without air bubbles. Remove the conditioned semipermea-
ble membrane from the water, flip it once, and place it on top of the filter paper in the measuring cell
with the active side facing up. Carefully push it down with a finger so that it is positioned precisely in
the center of the measuring cell (Figure 4-10) .
Now, you can install the upper half of the measuring cell (Figure 4-9) . Rest the upper measuring cell
on the rear edge and carefully lower it toward the front. No air bubbles must be visible inside the
O ring. Use a finger to secure the upper half of the measuring cell
(Figure 4-11)
. Fold the clamping
yoke over the cell and tighten it very carefully.
Figure 4-11: Securing the upper measuring cell
Figure 4-10: Installed membrane and O ring Figure 4-9: Installing the upper measuring
cell