Heating Operating Instructions; Operating Tips - VWR 444-0566 Manuel D'instruction

H O I
EATING PERATING NSTRUCTIONS
The Hotplates and Hotplate-Stirrers have a micro-processor controlled heater
that is designed to bring samples to temperature quickly and accurately.
1. Getting ready:
a. Turn the heat knob to the off position. Plug power cord into a properly
grounded 3-prong outlet.
b. Place a vessel with solution and the appropriate accessories in the
center of the top plate. This is important because the vessel should
be over the hottest part of the top plate.
2. Setting temperature for Advanced Series:
a. Turn the heat knob clockwise until the display reaches the desired heat
setting. The display will flash the set-point temperature until the tem-
perature is reached, at which time the display will stopflashing. When
the heat is turned on the indicator light above the heat knob is illu-
minated. Removing or adding more to a sample content could cause
the temperature to fluctuate. If this occurs, the display will againstart
to flash until the set-point value is stabilized.
b. Temperature adjustments can be made without interrupting heating
by turning the heat knob clockwise to increase heat or counter-
clockwise to decrease heat.
c. To stop heating, turn the heat knob to the off position. Your vessel
can then be removed.
Caution hot top indicator:
The caution hot top indicator light warns that
the top plate is too hot to touch. The caution
hot top indicator light will illuminate when
the heat is turned on and remain on until the top
plate cools down.
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Recall last temperature button:
Advanced Series Hotplate/Hotplate-Stirrers have a built-in memory that
allows users to recall the last set temperature, even after the unit has been
turned off. (The temperature in memory is the last temperature that ran for
more than 5 minutes.)
Max Temperature:
If the unit has an aluminium top, the max temperature setting is 400°C. If
the unit has a ceramic top, the max temperature setting is 500°C.

OPERATING TIPS

The unit may overshoot the temperature up to 10°C before stabilizing at the
set-point. The two methods suggested to minimize overshoot are:
1. Metal containers minimize overshoot. CAUTION: When heating metal
containers on a ceramic top it is recommended to use the lowest
temperature setting possible to limit thermal stress to the ceramic top.
2. If a glass vessel is used, anticipate overshoot. Start with a setting 5-10°C
below the desired temperature. When the temperature stabilizes at
this lower setting, turn the heat knob to the final temperature.
Overshoot is then reduced to about 1°C.
The temperature display on the advanced units show the actual temperature
of the heater not the top plate or sample. The vessel contents being heated
may be at a lower temperature depending on the size and insulating qualities
of the vessel. It may be beneficial to monitor the temperature of the vessel
contents and adjust the set-point temperature accordingly.