OSMOMAT 050 User Guide
Page 21 of 51
Version 1.1 (2011-10-12)
4.6 Opening the Measuring cell
As described in chapter 3, you must first switch on the device.
Press the "CALIBRATION" button
to check the pressure ratios and protect the pressure transducer. The indicator light of the button lights
up, and after approx. 10-20 seconds the digital display shows "00.0". The display has a direct connec-
tion to the pressure gauge and shows the pressure ratios of the pressure transducer.
4.6.1 Initial Startup with Dry Measuring cell
When the system is delivered, a piece of filter paper is placed in the lower half of the measuring cell to
prevent damage during shipping. To open the measuring cell, loosen the tension screw and flip back
the clamping yoke. Then remove the upper half of the measuring cell.
Remove the O ring and the filter paper from the cell. It will be reused during assembly.
4.6.2 Removing the Membrane When the Measuring cell is Filled
If the measuring cell is already filled, great care must be taken during unscrewing while closely moni-
toring the pressure reading. If the alarm sounds, stop unscrewing immediately. After pressure com-
pensation, the alarm is silenced and you can proceed to open carefully. Loosen the tension screw, flip
back the clamping yoke, and remove the upper half of the measuring cell.
Remove the O ring and the old membrane together with the filter paper using the tweezers. Clean the
O-ring with water and keep it immersed in water until installation.
4.7 Cleaning and Filling the Lower Half of the Measuring cell
To clean the lower half of the measuring cell, first fill it with water up to the upper rim and then clean it
using a cotton tip or paper tissue. Next, fill it with ethanol and insert the tuberculin syringe with special
cannula (from the standard accessories) into the vertical bore at the bottom of the lower half of the
measuring cell
(Figure 4-6)
. This bore connects the measuring cell with the pressure transducer. Us-
ing the supplied cannula ensures that the pressure membrane is not destroyed.
Never use other cannulas, especially longer ones, because they would puncture the
delicate membrane of the pressure transducer.
Aspirate ethanol into the bore using the tuberculin syringe. Repeated eject/aspirate cycles clean the
bore and deaerate the area above the pressure transducer, which means that all the air bubbles are
removed.
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