12
Melting point
B-540
5 Operation
5.4
Preparation of samples
Granular crystalline and inhomogenous samples are crushed
in the mortar and then filled into the melting point capillary to
at least 4-6 mm. In order to obtain comparable results, it is
essential that all three capillaries are filled to the same height
and that the substance is compacted.
Compaction is obtained either by knocking the capillary on a
hard base or letting the capillary drop onto the table through a
glass tube of approx. 1 m length.
5.5
Determination of a melting point
The following items must be known before a melting point
can be determined:
a
Is the approximate melting point known ?
if not
R
see 5.7.2
b
Is a sample name to be entered ?
if yes
R
see 5.6.1
c
Where is the SETPOINT of the determination located ?
SETPOINT input
R
5.5.1
d
How fast should the temperature rise (GRADIENT)
between SETPOINT and MAXPOINT ?
GRADIENT input
R
see 5.5.2
e
Is the difference between SETPOINT and MAXPOINT to
be more than 15°C ?
Change MAXPOINT
R
see 5.5.3
