Operation; Hard Switch; Setting The Stirring Speed - Thermo Scientific SUPER-NUOVA+ Operating Manual

Operation

WARNING:Use caution when heating volatile
materials; top surface and element can reach
the "Flash Point Temperature" of many
chemicals. These hot plates are not explosion
proof. Fire or explosion may result. Unit contains
components which may ignite such materials.
Use appropriate hand and eye protection when
handling hazardous chemicals. "Caution: Hot
Top. Avoid Contact." The top plate of the unit
can remain hot for some time after use. A
"CAUTION - HOT TOP" light will remain on until
top plate temperature cools to below 50°C.
Note: Boiling times are dependent on solution volume and
the surface area of the flask that is exposed to the hot plate.
For example, when heating the same amount of solution in a
2 L flask vs. a 1 L flask, the solution will heat about 20% faster.
Note: The top plate temperature will be higher than the
solution temperature.

Hard Switch

+
The SUPER-NUOVA unit has a hard switch on the left side of
the unit. The unit may be powered on by pressing the hard
switch. When the unit is turned on, the unit will initialize and
then model name will be displayed on the first row of display
screen while software version in second row. To turn off
power to the unit, press the hard switch off.
Figure 5. Hard Switch
22 | Operation

Setting the Stirring Speed

+
The SUPER-NUOVA stirring unit has an electronic feedback
speed control which will maintain a precise speed setpoint
from 50 rpm through 1500 rpm.
(Maximum speed is dependent on viscosity of the solution.)
+
The SUPER-NUOVA stirring hot plates are equipped with a
strong magnet and high torque motor which will draw a vortex
in fluids up to 700 cp.
To set the stirring speed, press "SPEED" key located under
display. Then the speed setpoint will flash. Use the knob on
the front panel to set a speed. Turn the knob clockwise to
increase the speed or counterclockwise to decrease the
speed. When desired setpoint has been reached, press the
"SPEED" key or wait 10 seconds, the speed setpoint will no
longer flash indicating that it has been set.
Figure 6. Setting the Stirring Speed
Once the unit begins stirring, the display will indicate both
actual speed and setpoint. To stop the stirring action without
changing your setpoint press the knob once. To resume
stirring at the set speed, press the knob again.
To turn stirring off, press "SPEED" key under the display and
turn the knob counterclockwise until the display reads "OFF".
Note: Boiling times are dependent on solution volume and
the surface area of the flask that is exposed to the hot plate.
For example, when heating the same amount of solution in a
2 L flask vs. a 1 L flask, the solution will heat about 20% faster.
Note: The top plate temperature will be higher than your
solution temperature.
Hot Plates, Stirrers and Stirring Hotplates