samples in the laboratory and can be used in two
different modes, as a precise temperature
controller from 20 to 200°C or as a digital
thermometer from -4 to 325°C.
Connection of the SCT1 temperature controller
probe is via the DIN probe socket located at the
rear of the hotplate (figure 2).
In control mode, the heat control of the hotplate
is disabled, allowing precise control of sample
temperature via the SCT1 temperature controller.
The illuminated contact thermometer indicator
LED indicates communication between the SCT1
temperature controller and hotplate (Figure 3).
When used in monitor mode, the SCT1 operates
as a digital thermometer and the hotplate
temperature is controlled by the “HEAT” control
knob as described above. In this mode the LED
temperature segments adjacent to the “HEAT”
control knob (analogue 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
SCT1 temperature controller manual.
Cleaning and Care
Before attempting cleaning:
Ensure that the top is cool, disconnect from the
mains electricity supply.
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.
During cleaning and general operation take care
not to scratch the surface of the top plate as this
could result in subsequent thermal breakage.
WARNING:
A ceramic top which is
scratched, chipped, chemically etched or
damaged must not be used.
Metal top units:
The metal top plate should be cleaned using a
damp cloth and a mild detergent solution.
Cleaning is made easier if spillages are attended
to promptly. In any case, spillages of acids and
alkalis MUST be removed immediately as these
chemicals can attack and damage the surface of
the coated aluminium alloy. Ensure that the
appropriate safety precautions are observed.
Preparation of media
Take particular care when heating liquids having a
high viscosity. Viscous liquids can act as thermal
insulators and can cause thermal breakage of the
glassware. This is very important with media
solutions as the viscosity will usually increase as
the temperature rises.
❖
Check that the stirring action is sufficient to
agitate the whole of the liquid. Unstirred areas
in the liquid can result in uneven heat transfer
and “hot spots” in the glassware. This can
induce thermal stress and so cause failure.
❖
Check the stirring action regularly to ensure
that it remains adequate as the viscosity of the
solution increases.
❖
Always use the largest magnetic follower
possible and if necessary, use a mechanical
overhead stirrer.
❖
Do not use glass vessels with thick walls, e.g.
Pyrex Heavy Duty Ware or standard beakers
and flasks having capacities of 5 litres or
greater.
❖
NEVER heat glass bottles on a hotplate.
❖
Ensure that the heat is built up slowly to avoid
localised overheating.
❖
Ensure the glassware is completely free from
scratches or other defects.
❖
Place the hotplate in a tray large enough to
contain the liquid in the event of glassware
failure.
❖
Wear the appropriate safety clothing e.g.
gloves, goggles, protective apron etc.
Storage
The unit is designed so that the top plate fits into
the base plate of the next unit for easy and
compact storage when placed on their side (see
figure 5).
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