Chemglass CG-1995-V-10 Manuel d'utilisateur télécharger pdf (Page 2)

1. Introduction

The application of new technology has led to the creation of these modern magnetic stirrers for laboratory use whose basic

features are safety, reproducibility of results, high performance and energy saving.

The structure of the unit is made out of pressure die-cast aluminum treated with epoxy resins offering a high resistance to

the many chemical aggressions typical of the laboratory environment. The meticulously studied design of the pressure die-

cast casing combines aesthetic fluidity with ergonomics. A wide central recess on both sides offers a good grip and

facilitates bench-top handling whilst the handle moulded directly into the rear of the die-cast structure can be used to

transport the instrument once it has been disconnected from the power supply.

The pressure die-cast 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 ceramic coating and 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: 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:

 AREX 3 Heating Magnetic Stirrer  Power supply cord  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. Connect the unit to the power supply using the transformer supplied.

Ensure that the socket and the relative cut-off device conform to current safety norms and are easy to reach.

2.2 Start-up

Rotate the speed (right) and temperature (left) knobs completely to the left. 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

REGULATION KNOBS

The right knob on the front of the unit can be used for quick precision regulation of

mixing speed from 50 to 1200 rpm. The left one is for temperature, up to 370 °C.

ON-OFF SWITCH

The on-off switch turns the unit on and off. If the switch is in the “OFF” position the

unit is off; if the switch is in the “ON” position the unit is on.

Always turn the unit off after use.

3.1 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

immerged in the sample. Connect the two instruments (AREX 3 and VTF) by plugging the VTF into the dedicated socket on

the back of the AREX 3.

Select the operating temperature required on the VTF thermoregulator. Turn the temperature control knob on the front panel

of the AREX 3 to maximum.

The heating magnetic stirrer always has primary control of the heating plate temperature.

When using the VTF thermoregulator always select the max temperature on the AREX 3. 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 setting on the AREX 3 meaning that a longer heating time is required in order to reach the VTF

thermoregulator temperature setting.

3.2 Error messages

The unit is fitted with safety devices which cut-off the power supply to the heating plate in the case of malfunctions.

The led display on the front panel indicates the type of malfunction:

Display indicator: Malfunction:

Flashing Stirrer led (twice/second) Fault in the overheating circuit

Flashing Heating led (twice/second) Heating plate in overtemperature

The Heating led doesn’t light up Fault in the temperature reading circuit

Should any of the above occur, please contact your nearest VELP Scientifica service centre.

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Chemglass CG-1995-V-10 Manuel d'utilisateur Page 2

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