5
Operation
Analog Hotplate Models
Switch the unit on using the power on/off switch (see Figure 2).
The control dial labelled “HEAT” on the front panel controls the heat output and hence the plate
temperature. The approximate temperature is indicated visually by LED back-lighting that increases
from Green to Red. The temperature range for your model can be referenced in the technical
specifications section.
Turn the control dial clockwise to the desired plate temperature. As the plate heats up the LED
temperature segments around the dial will light up in turn and their light intensity increase until the
surface temperature is reached. The LED temperature segments refers to the temperature of the top
plate and not to the temperature of the contents of the vessel being heated. Conversely if the unit is
cooling, the LED temperature segments will go out as the plate approaches the set temperature.
Digital Hotplate Models
Switch the unit on using the power on/off switch (see Figure 2). When the control dial labelled “HEAT”
is pointing to the Power on/off position, the LED display will show the word “OFF”. Turn the control
dial to the required temperature which will be shown on the LED display. The temperature will
increase in 5°C (41°F) steps. A few seconds after setting the temperature, the display will revert to
showing the actual temperature of the hotplate.
If the unit is switched off using the power on/off switch while the control dial is in a set position, the
next time the unit is switched on, the LED display will show the word “On” followed briefly by the
previously set temperature. The display will then revert to the actual top plate temperature and the
unit will then begin to heat to the set temperature.
WARNING:
When the surface becomes too
HOT
to touch the red "
HOT
" warning light on the
front panel will begin to flash (see Figure 1). This will continue to flash while the plate
temperature is above 50°C (122°F) for a maximum of 30 minutes, even if the unit is
disconnected from the electricity supply.
WARNING:
The plate may still be
HOT
beyond 30 minutes when large masses are left on the
plate, even though the
"HOT"
warning light has gone out.
WARNING:
The top surface of the instrument may be
HOT,
especially in free air when a
surface temperature of 450°C (842°F) can be achieved on the ceramic top models and 325°C,
(617°F) on the metal top models. Do not leave heaters switched on when not in use.
HOT
1
2
3
4
5
6
7
8
9
STIR
off
Power
on/off
HEAT
Power
on/off
HEAT