Specifications

desired setpoint. Now plug your probe into the
unit, change the setpoint to your desired solu-
tion temperature, and place the probe in your
solution.
Without a Probe
If you are heating larger volumes and do not
intend to use the probe to maintain a precise
solution temperature, faster heating can be
achieved by turning the heat control knob to
maximum temperature until the solution starts to
heat, and then turning the setpoint back to your
desired top plate temperature.
Heating Small Volumes
To heat small volumes quickly it should not be
necessary to preheat the solution at a higher
temperature. By not preheating small volumes
you avoid the potential for the temperature to
overshoot your desired setpoint. If you plan to
control the solution temperature of a small vol-
ume sample with the probe, initiate heating with
the probe in the solution; no preheating should
be required.
Heating Metal Vessels and
Sand Baths
Metal vessels and sand baths cannot be heated
on most solid ceramic tops because of the ten-
dency for the metal and the sand to reflect heat
back into the top, eventually exceeding the
maximum temperature rating for a ceramic top,
which causes it to break. Because the
advanced electronic control in the MIRAK is
capable of precisely regulating the top plate
18
OPERATION
Note
If you allow the top plate to
reach the maximum tempera-
ture of 540°C while preheating
and then turn the control down
to a setpoint less than 200°C,
the temperature of the top will
drop rapidly to 200°C. Because
of the natural cooling charac-
teristics of ceramic, the temper-
ature of the top will drop much
more gradually after the top
plate temperature reaches
200°C.