V&P Scientific, Inc.
3
Technical Note 349 03/06/18
3. Setting the Timer: Push the “P” until you see the “Time” display. Set your time in HH:MM. Please
note that the timer will not start counting down until the heating block has reached the Set Point
temperature.
4. It is not advised to adjust the rAtE setting.
Figure 3. Controller Display for a VP 741GA Series Heat Block
3. Although the center of the Heating Block will be at the temperature on the display, the actual
temperature of samples in the microplate wells or tubes will be 3°C to 5°C below this temperature
depending upon the efficiency of heat transfer. It is recommended that the temperature in one or more
samples be measured to determine appropriate setting for a particular application.
4. For faster heat transfer, use a Heating Block Insert such as one that conforms to the bottom of a
plate. Visit our website for our line of Heating Block Inserts.
http://vp-sci.com/products/heating-
cooling/heatblock-inserts.html
5. The upper limit temperature on the Controller is set to 150
o
C at the factory. Temperatures higher
than 120
o
C should not be used with polypropylene tubes or microwell plates. Polypropylene will melt at
temperatures greater than 130
o
C. To operate at temperatures above 120
o
C, use of glass or other high
temperature-stable containers is recommended.
OPERATION WITH A MAGNETIC TUMBLE STIRRER
If using with a V&P Scientific Magnetic Tumble Stirrer, please also follow the instructions for the Stirrer.
The VP 741GA Series Heating Blocks are made of graphite which does not produce Eddy Currents
with magnetic fields. They are ideal for stirring applications. Please contact V&P Scientific for more
information.
Product Maintenance
GENERAL PRODUCT CARE
When not in use, turn the power switch off.
Do not place the Controller in chambers with temperatures above 40
o
C.
Do not submerse Heating Block or Controller into liquid or allow liquid to come into contact with any
openings.
Function Key
(F)
Program
Key (P)
Up/Down
Arrows
Power
Cable
On/Off
Power
Switch
