6
Stirring Models
Your unit is provided with two 25mm (1 in.) PTFE stirrer bars. These should be placed in the liquid to
be stirred. They are suitable for liquid volumes up to 500mL (16 fl oz).
Turn ON by turning the dial clockwise from the OFF position.
The control dial labelled “STIR” on the front panel controls the stirrer speed. When switched on, a
green light illuminates (see Figure 1). The dial is graduated with an arbitrary 1-9 scale. Turning the dial
to a higher number increases the stirrer speed.
Using the Optional Temperature Controller Accessory
The temperature controller allows accurate temperature control of aqueous and oil based samples in
the laboratory and can be used in two different modes, as a precise temperature controller from 20°C
to 200°C (20°F to 392°F) or as a digital thermometer from -4 to 325°C (25°F to 617°F).
Connection of the temperature controller probe is via the DIN probe socket located at the rear of the
hotplate (see Figure 2).
In control mode, the heat control of the hotplate is disabled, allowing precise control of sample
temperature via the temperature controller. The illuminated contact thermometer indicator LED
indicates communication between the temperature controller and hotplate (see Figure 3).
When used in monitor mode, the controller operates as a digital thermometer and the hotplate
temperature is controlled by the “HEAT” control dial as described above. In this mode the LED
temperature segments adjacent to the “HEAT” control dial (analog models) or the LED temperature
display (digital models) refer to the surface temperature of the hotplate not the sample.
For full instructions on use please refer to the temperature controller user guide.
Cleaning and Care
Before Attempting Cleaning:
Ensure that the top is cool, disconnect from the power supply.
Metal Casework:
The metal casing should be cleaned using a damp cloth and a mild detergent solution.
Ceramic Top Units:
A damp cloth will normally remove most types of contamination. For more difficult stains a domestic
cream cleanser is recommended.
Cleaning is made easier if spillages are attended to promptly. In any case, spillages of alkali,
phosphoric acid and hydrofluoric acid MUST be removed immediately as these chemicals can attack
and damage the glass ceramic. Ensure that the appropriate safety precautions are observed.
HOT
1
2
3
4
5
6
7
8
9
STIR
off
Power
on/off
HEAT
Power
on/off
HEAT