Temperature Control Unit Tcp/P And Tcp/Pe - Thermo Scientific HAAKE RotoVisco 1 Instruction Manual

Temperature Control Units
Diagram of a
Peltier module

11.5 Temperature control unit TCP/P and TCP/PE

The temperature control unit has a measuring plate  60,
which is at the same time the location for other measuring
plates. The measuring plate is put on the Peltier temperature
control unit and fastened.
The additional plates MPC are only necessary if the same
cone--plate diameter is used for measuring.
Temperature control is carried out electrically via a Peltier
element within a temperature range of --40 to 180C.
The Peltier process
The temperature control system is based on a component
which uses the Peltier effect. This effect which is the reverse
of the thermoelectric effect (e.g. used by thermocouples),
was discovered in 1834 by the French physicist Jean Peltier.
Peltier elements consist of two semiconductor bridges of dif-
fering doping (p- and n-type). Stimulated by a (regulated di-
rect-)current flow, the electrons transport heat from one con-
nection point to the next.
n- and p-doped elements
Cold side
Hot side
The heat flow direction is dependent on the current flow
direction. Peltier temperature control systems can thus be
used for both heating and cooling depending on the current
flow direction.
The heating or cooling capacity i.e. the transported heat
quantity is proportional to the current strength depending on
the semiconductor material used and the number of Peltier
elements electrically connected in series within the Peltier
module.
61
contact bridges
electric insulation