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1. Introduction
Overhead stirrers are generally used for laboratory applications where the solubilization, mixing, suspension, emulsioning
and homogenization of samples is required.
The PW, LH, LS and ES overhead stirrers with electronic speed control and advanced safety features are able to satisfy the
most diverse needs of the laboratory in terms of both viscosity and volume.
The chuck is keyless and ensures a secure and easy-to-fit mount for stirring shafts of up to 10mm in diameter.
The stirring speed is electronically controlled. The shaft bearings and belt drive ensure silent running.
Fig. 1
2. Assembly and installation
Check the integrity of the unit after unpacking. The box includes:
Overhead stirrer
Instruction manual
Allen key
Allen head screw
Shaft
Power suppy cable
2.1 Electrical connection
After unpacking 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.
Ensure that the socket and the relative cut-off device conform to current safety norms and are easy to reach.
2.2 Start-up
Assemble the shaft using the Allen head screw. Fasten the instrument securely to the support rod (A00001300) with the
double clamp (A00001301). Secure the receptacle using the ribbon clamp (A00001302) to avoid damage.
2.3 Information about construction materials
Housing Die casting Polymer
Structure Aluminum
Control panel PET
3. Operating controls
Turn the unit on using the mains switch. Turn the potentiometer knob to be select the stirring speed.
Stirring speeds are indicated on the analogue scale around the knob.
NOTE:
The speed setting is saved when the instrument is turned off or if there is a power failure.
When the instrument is turned on again, stirring starts at the previously set speed.
3.1 Overload protection
The current and voltage are electronically limited in order to safeguard the motor and the electronic parts against electric
surges.
In the event of abnormal conditions arising the unit shuts down automatically.
Over Load
Current surges
The stirrer can compensate for eventual current surges for a limited period of time.
If the situation persists, the speed of the motor is gradually reduced, when a speed of 0 is reached the unit shuts down.
Over Curr
Rpm error
This error occurs if the chuck is accidentally blocked or if the number of revs exceeds the max. permitted value.
Over Temp
Temperature error
This error occurs if the unit is used for heavy-duty work for prolonged periods of time and at an ambient temperature that
exceeds the max. permitted temperature.
Before resetting the instrument allow it to cool down.
Over Volt
Voltage surge
The software limits the power supply of the motor to the nominal value of the motor itself (60V).
A high speed setting or a heavy load on the chuck may prompt a higher voltage. In this case the voltage is limited to the
nominal value of the motor (60 Volt) and the number of revs is reduced accordingly.
If for any reason the power supply of the motor exceeds the maximum thre
shold value of 70V, “OVERLOAD” the unit will
shut down.
NOTE:
To reset the unit remove the load from the chuck and turn the unit off and on again using the mains switch.
EN
1- Chuck
2- ON/OFF switch
3- Control knob
