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1. Introduction
AM4 Digital PRO heating magnetic stirrer with four aluminium alloy plate is used in laboratory for general use and for all
those applications that require precise stirring speed regulation and temperature of the heating plate temperature.
Aluminum structure is treated with epoxy resins offering high resistance to the most chemical aggressions typical of
laboratory environment. The structure is designed so that accidental liquid spills cannot reach the internal parts of the unit.
The electrical connections are recessed into the rear of the instrument and offer optimum electrical protection of the external
electrics in the case of liquid spills. The engineering of the unit facilitates internal inspection if technical assistance is
required.
The heating plate is made out of aluminum alloy with special coating and it is specially treated to ensure:
• Optimum heat distribution and a high specific power thanks to the circular configuration
• Optimum temperature homogeneity across the plate
• High resistance to thermal stress and thermal shock, chemical aggressions, scratches and surface abrasions.
Magnetic stirring is generated by the VELP Scientifica Patented Composite Magnet driven by an asynchronous mono-phase
brushless motor in alternating current which offers a virtually unlimited duration.
NOTE: If the heating function is used the vessel must be made of a suitable material to withstand the foreseen temperature.
NOTE: It is therefore advisable to choose the most suitable magnetic stir bar in relation to the quantity and characteristics of
the liquid and the type of vessel used.
NOTE: using the heating plate at high temperatures may cause discoloring. This does not alter the thermal, mechanical and
chemical resistance of the plate in any way.
2. Assembly and installation
Check the integrity of the unit after unpacking. The box includes:
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•
Heating Magnetic Stirrer
Instruction manual
2.1 Electrical connections
After having unpacked the instrument, place the unit on the laboratory bench.
Before connecting the instrument to the power supply, make sure that the values on the rating plate correspond to those of
the power supply. The equipment shall be connected to a power socket with protective earth connection, using only the
power supply cord provided with the instrument.
Ensure that the socket and the relative cut-off device conform to current safety norms and are easy to reach.
NOTE: the mains cable must remain far away from the hot plate.
2.2 Start-up
Rotate the speed (right) and temperature (left) knobs to the OFF position. Place the flask containing the sample and a
suitable magnetic stirring bar on the stirring plate. Then, set the speed and temperature by turning the dedicated knobs.
3. Operating controls
3.1 Turning on and regulating
Connect the unit to mains and turn it on using the on-off switch. In the next 5 seconds, displays shows the software version
and the restarting mode (A or b, chapter 3.4 "Setting mode").
Start the stirring function by turning the stirrer knob "Stirrer rpm" on the front panel. Speeds from 50 to 1500 rpm (10 rpm
resolution) can be selected. The speed shown flashes until it reaches the set-point. A microprocessor ensures constant
speed even when the viscosity changes (counter-reaction).
To start the heating function turn the heating knob "Heating °C" on the front panel. Temperatures from 5 to 370 °C can be
selected at 5 °C intervals. The display shows the real temperature but every 5 seconds temperature set point is shown for 1
second, indicated by the central led on the display "Set" turned on.
NOTE: in case of black-out, once the power is back the device will restart in the restarting mode set (Opt tYpE, chapter 3.4).
When heating is turned Off (Heating knob OFF) and the heating plate temperature exceeds 50 °C, the message "Hot"
flashes on the display until the temperature of the heating plate falls to below 50 °C (or until the instrument is turned off
using the ON/OFF switch).
NOTE: this warning is not active if the instrument is not powered.
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