1 THE OSMOMAT 070 VAPOR PRESSURE OSMOMETER ...

32 User Guide OSMOMAT 070 Version 1.1
Figure 4-2: Example: Creating the solvent
4.1.3 Preparing the syringes
Fill two syringes with solvent and up to four syringes with the prepared solutions. The syringes must
be clean and dry and should be filled without air bubbles. Insert the two syringes with the solvent in
Positions “0” and “0” (Figure 1-5).
Place the four syringes with solutions in Positions 1-4, starting with the solution that has the lowest
concentration.
4.1.4 Rinsing the probes
Dropwise addition and rinsing of solvents and solutions must be performed very conscientiously and
within the same timeframe.
Before every rinsing process, press the “Light” key on the front panel of the device to switch on the
interior lighting for about 20 seconds and observe the dropwise addition through the mirror. Because
measurement effects are measured with a temperature resolution of about 1x10E-5°C, any
temperature errors should be reduced to a minimum. For a reproducible measurement, the size of the
drop around the end of the probe is extremely important. To generate an optimal reproducible drop
size and efficiently rinse the measuring probe, you should proceed as follows.
During rinsing, press the syringe down securely so that the end of the needle is above the probe coil.
Carefully press down the plunger and turn it slightly at the same time to apply the liquid to the probe
coil. Rinse the temperature sensor and moisten it with liquid. After two or three drops have dripped off,
stop the inflow for a moment while a drop is falling. The afterflow of the liquid causes a medium-sized
32 User Guide OSMOMAT 070 Version 1.1