27
Melting point
B-540
5 Operation
5.8
Boiling point determination
The sample liquid is filled into the capillary of 3.2 mm internal
diameter to a height of 5-10 mm. Use a syringe for easy filling.
The boiling capillaries are plunged into the sample with their
thick end. Switch the master switch on. Place the sample
capillary into the sample holder. The position for boiling point
determination is either fully to the left or to the right of the
sample holder.
If the approximate boiling point is not known, the SETPOINT
should be selected as low as possible and the temperature
GRADIENT and the MAXPOINT as high as possible (analogously
to the melting point determination, section 5.6, a quick deter-
mination for orientation is carried out). If the approximate boiling
point is known, enter the SETPOINT, GRADIENT and MAX-
POINT (analogously to melting point determination with known
melting point, section 5.5.5).
The boiling point has been reached when a quick continuous
flow of bubbles (like a string of pearls) is formed at the plunged-
in end of the capillary.
Siedepunkt 100 °C
Boiling point 100 °C
Point d'ébullition 100 °C
20 °C
95 °C
100 °C
Figure 10: Boiling point determination
