Chemglass CG-2024-10 - Manual (Page 2)

2
1. Introduction
Overhead stirrers are generally used for laboratory applications where the solubilization, mixing, suspension, emulsioning
and homogenization of samples is required. CG-2024-10 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 controlled by a microprocessor and is constantly and automatically re-aligned to the set value even when there are
variations in the viscosity of the liquid. Fluctuations in the voltage within the accepted range do not alter the quality of stirring
speed alignment. The stirring time is controlled electronically, values of up to 999 minutes and 59 seconds can be set and
the time remaining displayed on the LCD. The relative torque value can also be displayed.
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 with the double clamp.
Secure the receptacle using the ribbon clamp 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. After a few seconds the instrument model and the software version will appear on
the display. When the instrument is in use the graphic display shows the real chuck speed (rpm) and the set speed (rpm
set). Speed and time functions are controlled by an encoder. Turn the control knob to select stirring speeds of from 50 to
2000 rpm. Press the control knob to activate the timer and turn the knob to select the stirring time. Stirring times of up to
999’:59” can be selected. Press the control knob to start count-down. At the end of the set time stirring stops and “END” will
appear on the display.
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, the value flashes for approximately 8 seconds before stirring starts. During this time the speed setting can
be changed using the control knob.
3.1 Torque indicator
Keep the control knob pressed for approx. 3 seconds to display the torque trend value, i.e. the value in Ncm of the effective
torque on the stirring shaft .
To reset the torque value and measure the relative torque, keep the control knob pressed for approx. 3 seconds.
NOTE: The torque value indicated is not an absolute value. The reading indicates the variation in the torque value
compared to a set value defined by the operator. The most precise torque trend values are obtained once the instrument
has reached the optimum working temperature -Optimum time 10-15 minutes.
3.2 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 following error messages appear on the display and the unit shuts
down automatically.
Over Load
Current surges
The stirrer can compensate for eventual current surges for a limited period of time in which case the following symbol
appears in the top rh corner of the display . If the situation persists, the speed of the motor is gradually reduced.
When a speed of 0 is reached “OVERLOAD” appears on the display and the unit shuts down.
1- Chuck
2- ON/OFF switch
3- Display
4- Control knob