Page 28 of 41
Medusa 510/511 Series Iss.11 – 07/12
OPERATING THE MEDUSA 511
The Medusa 511 is a 3 Zone Block Bath used to create an even temperature profile along the part of the block in
which fixed point cells will sit.
The main heater is used to set the required temperature the top and bottom heaters are used to compensate for the
end effect heat losses.
The top and bottom heater control settings are preset for the Aluminium Point - unless the Medusa is supplied with
an alternative ITS-90 fixed point.
To change the offsets (e.g. for tin and indium points) the offsets may need to be reduced. The offsets are simply
changed with the up and down buttons of the respective controller.
As a first approximation the offsets may be reduced proportionally with temperature.
Offsets may be checked and optimized by placing a small thermocouple adjustment to the block. By raising and
lowering the thermocouple the profile can be obtained and then optimise by adjustment of the controllers.
