Cole-Parmer HP-200 Serie Manual De Instrucciones página 6

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 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 can be
achieved on the ceramic top models and 325°C
on the metal top models. Do not leave heaters
switched on when not in use.
Stirring
ST-200-C, SHP-200-C, SHP-200D-C, ST-200-S,
SHP-200-S, SHP-200D-S
Your unit is provided with a two 25mm PTFE stirrer
bars. These should be placed in the liquid to be
stirred. They are suitable for liquid volumes up to
500ml.
Switch the unit on using the mains on/off switch
(see figure 2). The control knob labelled "STIR"
on the front panel controls the stirrer speed..When
switched on a green stir-on light illuminates, (see
figure 1). The knob is graduated
with an arbitrary 1-9 scale. Turning the knob to a
higher number increases the stirrer speed.
Using the Optional Accessory TC-200D
Temperature Controller
ST-200-C, SHP-200-C, SHP-200D-C, ST-200-S,
SHP-200-S, SHP-200D-S
The TC-200D 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 to 200°C or as a digital thermometer from -4
to 325°C.
Connection of
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 TC-200D temperature
controller. The illuminated contact thermometer
indicator LED indicates communication between the
TC-200D temperature controller and hotplate
(Figure 3).
6
the TC-200D temperature
When used in monitor mode, the TC-200D 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
TC-200D 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