9
3.2 Using the thermoregulator VTF
Screw the threaded support rod (optional accessory, A00001069) into its seat on the back of the instrument and fasten the
VTF thermoregulator onto the support rod. Place the temperature probe in the receptacle making sure that it is completely
inserted in the sample. Connect the VTF into the dedicated socket on the back of the AM4 Digital PRO. Select the
operating temperature required on the VTF thermoregulator. Turn the temperature control knob on the frontal panel to
maximum value. The heating magnetic stirrer always has primary control on the heating plate temperature. With VTF
thermoregulator always select the max temperature on the Heating magnetic Stirrer. The temperature control function of
the heating plate can also be used as a safety thermostat. In this case the maximum temperature of the heating plate will
not exceed the temperature set on the Heating magnetic Stirrer meaning that a longer heating time is required in order to
reach the VTF thermoregulator temperature setting.
3.3 Using the external probe
Screw the threaded support rod (optional accessory, code A00001069) into its seat on the back of the instrument and
fasten the clamp (optional accessory, code A00000004) onto the support rod. Fit the temperature probe A00000268 into
the clamp making sure that it is completely immerged in the sample.
Plug the temperature probe A00000268 into the dedicated socket on the back of AM4 Digital PRO with the instrument off.
A led on the left-hand side of the display indicates that the probe is connected, the display indicates the probe temperature
reading. Select the operating temperature using the heating knob on the AM4 Digital PRO. A led at the center of the display
indicates that the set-point temperature is shown; after 5 seconds the led goes out and the display indicates the probe
temperature.
3.4 Setting mode
Turn the left knob twice from the minimum to the maximum during the visualization of the software version in order to enter
into the setting mode.
Once there, by turning the left knob, it is possible to pass from one of the following parameter to the next ones:
Turn the right knob from the minimum to the maximum and then back to the minimum in order to pass to the parameter you
want to modify. The display will show the value saved for 3 seconds, and then the new value according to the position of the
right knob.
The new value is automatically saved after 4 seconds, if during this time the right knob is not moved (no change of value).
“dOnE” is shown and then the system goes back to the main menu.
Once the new values are set, switch off and restart the instrument.
(*)
When
A
is selected: in case of black-out, once the power is back the device will remain off
When
b
is selected: in case of black-out, once the power is back the device will automatically restart with the latest
settings
(**)
Select
FInE
to minimize overshoot and fluctuations of temperature.
Select
FASt
to save time.
(***)
When
POn
is selected: if the instrument don’t measure an increase of temperature, a signal of alarm is shown.
3.5 Error messages
If an error mess
age appears on the display, please contact VELP Scientifica’s technical service department.
When the display shows an error message, the stirring and heating functions stop automatically.
NOTE:
To remove the error message disconnect the instrument from the power supply.
AL1
Overtemperature (temperature is higher than 430 °C)
AL2
Excessive heating time
AL3
The stirring system doesn’t run correctly
AL4
Overtemperature of the external probe (temperature is higher than 260 °C) - only when A00000268 is connected
AL5
Overtemperature of the safety probe (temperature is higher than 430 °C)
AL6
Probe not inserted inside the sample
Parameter shown
Default value
Range
Description
CAL
P100
0,0°C
-10,0 ÷ +10,0°C
External probe calibration
CAL
tA
0,0°C
-10,0 ÷ +10,0°C
Probe calibration at 20°C
FS
tCJ
370°C
0 ÷ 370°C
Maximum temperature settable
OPt
tYpE
A
A
– b
(*)
Restarting mode
OPt
P100
FASt
FInE - FASt
(**)
Type of control with external probe
ALL
P100
POn
POn-POFF
(***)
External probe safety
