Stuart SMP10 Bedienungsanweisung Seite 4

Once measuring is started the SMP10 will heat
slowly (2°C per minute) from the plateau
temperature until the melt occurs. This slow rate
of heating allows very accurate melting points to
be obtained.
Before Use
Place the unit on a firm, level surface and extend
the feet at the rear of the instrument so that the
unit is at a convenient viewing angle.
Connect to the mains electricity supply and
switch on by means of the mains on/off switch.
The actual block temperature will now be shown
on the three digit LED display and the
illumination in the sample chamber will come on.
Measuring a Melting Point
N.B. If the unit has been used recently the block
may be too hot for your sample. If this is the case
press the stop button and allow the unit to cool
before proceeding.
1. Prepare sample by placing a small amount in
the end of a glass capillary tube.
2. Decide on a suitable plateau temperature.
This should be approximately 10°C below
the expected melting point of the sample.
3. Check that all 3 function lights are
extinguished. If not, press the stop button.
4. Press and hold the set button (the plateau
light will flash). The display will now show
the current plateau temperature. When first
switched on this will be 50°C but note that
if the unit has recently been used the value
may have been re-set by the previous user.
5. The desired plateau temperature may now
be set using the arrow keys to scroll the
display up or down as required.
2
6. Release the set button. The new plateau
temperature is now set and all function
lights will go out (The plateau setting can be
checked at any time during operation by
pressing and holding the set button). This
action will not interfere with the operation
of the unit).
7. Insert the tube into the side of the heating
block via the holes provided. For
convenience this can be done from either
side of the block. Look down the magnifier
and position the tube so that the sample
can be observed clearly.
Caution: The heating block may be HOT.
8. Press the start key. The unit will quickly heat
up to the plateau temperature (the heating
light will be illuminated - see figure 1)
9. Once the plateau temperature has been
reached the plateau light will be illuminated
as well as the heating light - see figure 1.
N.B. At low plateau temperatures there may
be some overshoot. Wait until the plateau
light comes on before proceeding in order to
ensure that the temperature has stabilised.
10. Press the start button again. The block will
begin to heat at the pre-set ramp rate of
2°C per minute (The plateau light will go
out and the ramping and heating lights will
both be illuminated - see figure 1.)
11. Observe the sample until the melt occurs
and record the temperature from the digital
display.
12. After the melt has occurred press the stop
button. All function lights will go out and
the unit will cool to ambient temperature.
13. Pressing the start button again will cause the
unit to return to the plateau temperature
instead of ambient. The heating light will
come on even if the temperature is above
the plateau and the unit is, in fact, cooling.