BLOCK HEATERS
BH-200-2, BH-200D-2, BH-200D-2-HT,
BH-200D-3, BH-200D-3-HT BH-200DC-2 and
BH-200D-2-HTC.
For your own safety and that of others
please read and understand the safety
advice given in section 9 of this manual
before using the equipment.
If the equipment is not used in the manner
described in this manual the protection provided
might be impaired.
1. General description
Cole-Parmer block heaters are designed to
accurately control the temperature of test tubes
and other small containers using heated
aluminium blocks drilled with holes of the
appropriate size for the containers in use. A
large variety of blocks with different holes for
different sizes and type of container are available
– see section 7.
The blocks are fitted into the recess in the top of
the instrument (see figure 1) and heated from
below. All blocks are fully interchangeable and
blocks for different sizes of container may be
used in a block heater at the same time.
The large thermal mass of the aluminium blocks
allows very accurate and stable temperature
control.
Perspex safety covers are available as accessories
for protection in the event of tubes “spitting”.
These also help improve temperature uniformity
within the blocks by excluding draughts.
2. Preparation for use –
All models
1. Follow the instructions for Electrical
Installation given in section 8 of this manual
and connect the instrument to the electricity
supply –
DO NOT SWITCH ON.
2. Choose aluminium blocks with holes suitable
for the containers to be heated.
3. Carefully place the appropriate number of
aluminium blocks into the recess in the top of
the instrument – see figure 1.
1
N.B. The plate at the bottom of the recess
and the base of the aluminium blocks must
be kept scrupulously clean to allow good
thermal contact. If foreign matter, especially
particulate matter, is present the
performance of the instrument will be
impaired.
4. Place the containers to be heated into the
holes in the aluminium blocks.
5. Fit safety cover if required. This may simply
rest on the top of the block heater or be
hinged by using the screws provided. These
should be located in the holes at the top rear
of the block heater (see figure1).
6. The instrument may now be switched on and
the desired temperature set.
3. Temperature setting
3.1
Digital models BH-200D-2, BH-200D-2-HT,
BH-200D-3, BH-200D-3-HT, BH-200DC-2,
and BH-200D-2-HTC.
1. Switch on using the switch located at the rear
of the instrument – see figure 2.
2. The “power” light will illuminate as will the
digital display - see figure 3.
3. The digital display will show the actual
temperature of the aluminium blocks. If the
instrument’s current set temperature is above
this value it will begin to heat and the “heat”
light on the control panel will illuminate. The
current set temperature may be viewed at
any time by pressing and holding the “set”
button – see figure 3.
4. To adjust the set temperature first press and
hold the “set” button to show the current
setting.
Figure 3 - digital controls
