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Temperature alignment
The micro-chip carries out automatic probe calibration therefore a probe calibration procedure is unnecessary.
Nevertheless, an offset value of from - 9.9 to + 9.9 °C can be set.
Temperature alignment
Turn the instrument on by keeping the
keys to modify the "Temperature alignment" parameters (Fig. 10).
Use the
and
If no key is pressed for 5 seconds the display shows the software version and the default set point value.
If no key is pressed for a further 5 seconds the display shows the probe temperature reading and saves the value.
Unit of measure
Turn the instrument on by keeping the
keys to modify the "Unit of measure" (Fig. 11).
Use the
and
If no key is pressed for 5 seconds the display shows the software version and default set point value. If no key is pressed for
a further 5 seconds the display shows the probe temperature reading in the new unit of measure and saves the value.
Safety devices and alarm signals
The instrument has an in-built safety and control circuit which is constantly active and shuts-down the VTF when an alarm
message appears on the display:
-
AL .1 = Unconnected probe or faulty probe (cut-off or short circuited) or temperature out of range.
-
AL .2 = Slow temperature increase read by the probe. This function is active in case of:
•
Probe temperature < 50°C
•
T set point – T probe > 5°C
-
AL .3 = Fast temperature decrease read by the probe.
To reset the thermoregulator turn it off and on again after having found and removed the cause of the alarm.
In order to bypass the AL .2 and AL .3, turn the instrument on by keeping the
using
and
keys. Press
4. Start-up
• Install the VTF on the support rod. Make sure that the probe is immersed in the liquid for at least 15 mm and that it isn't in
contact with the bottom of the container;
• Make sure the magnetic stirrer is turned on;
• Power the VTF by plugging the spiral cable into the dedicated socket on the heating magnetic stirrer;
• Set the magnetic stirrrer temperature to maximum;
• Select the temperature and the working time required;
• To optimize thermoregulation and improve temperature homogeneity, stir the sample gently but continuously.
WARNING
• When working with set points near the temperature of evaporation, check that the probe remains immersed in the sample
by at least 10mm throughout the work-cycle.
• The sample being processed is subject to evaporation and for this reason it may not reach the temperature selected.
5. End-of-work operations
To interrupt thermoregulation and leave the VTF thermoregulator powered, turn off heating plate using the knob on the
magnetic stirrer. In this way heating stops but the VTF continues to display the temperature.
If the timer has been set, the VTF will automatically stop at the end of the set time and the display will show "End".
To reactivate thermoregulation press
At the end of the process, if the VTF has to be left connected to the magnetic stirrer, turn the stirrer off.
From - 9.9 to + 9.9 °C
From - 17 to + 17 °F
and
keys pressed.
and
keys pressed.
to
confirm.
.
Default value
0.0 °C
0.0 °F
and
7
°C
Fig. 10
Fig. 11
keys pressed and select AL.oF
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