21
Melting point
B-540
5.7
Running melting point determination
5.7.1 Melting point determination with a known
melting point
The melting point determination may be started from any main
menu. The SETPOINT, GRADIENT and MAXPOINT must first
have been defined as described in 5.5.1–5.5.4.
By pressing START, the unit will heat up to the previously
selected SETPOINT. The display shows the temperature
gradient graphically.
The user is informed acoustically when the SETPOINT has
been reached. The graphic will change at the same time.
Samples are introduced into the sample holder.
By pressing START again, the temperature program is started
between SETPOINT and MAXPOINT and the display changes
to the detection phase.
The samples are viewed through the magnifying glass as
required. The melting point is retained by pressing SAMPLE
keys 1/2/3. Every pressing of the SAMPLE keys is ack
nowledged with a beep and confirmed with an indication on
the screen.
A maximum of three modifications of condition per sample
may be transmitted to the memory. If keys are pressed more
than 3x, the last three temperature values will be retained.
When the preselected MAXPOINT has been reached, the
unit will cool down automatically to the previously used SET-
POINT. The temperature program may be stopped before
reaching the MAXPOINT temperature by pressing STOP. Even
in this case, the unit will cool down to the previously selected
SETPOINT and display the values obtained.
Samp 1:
Determinated value for substance in capillary 1
Samp 2:
Determinated value for substance in capillary 2
Samp 3:
Determinated value for substance in capillary 3
By pressing MENU, the determination can be repeated.
By pressing STOP, the unit will cool down to ambient
temperature.
5 Operation
TEMPERATURE
:
25.0°C
SETPOINT
;
100°C
GRADIENT
:
2.0°C
MAXPOINT
:
120°C
PRESS START
TEMPERATURE
25.0 °C
SP 136 °C
TEMPERATURE
:
135.6 °C
GR
2.0 °C
MP 145 °C
TEMPERATURE
:
140 °C
GR
2.0 °C
MP 145 °C
M SAMP1 SAMP2 SAMP3
A XXX.X
XXX.X
XXX.X
-
C
N XXX.X
XXX.X
XXX.X
-
C
XXX.X
XXX.X
XXX.X
-
C
