Ensure the cooling water is flowing through the bath before pressing standby to switch on the
control unit. Press the standby key and the LED display will illuminate. The actual
temperature of the tissue bath is displayed. The unit is now operational and power is being
supplied to the tissue bath cooling head. Pressing either the ‘+’ or ‘-‘ keys once will display
the set temperature. Continuing to press the ‘+’ or ‘-‘ keys will change the set temperature.
The displayed temperature will revert back to the actual bath temperature a few seconds after
the last key press.
Standby
If the cooling bath is not connected or has a fault the unit will display ‘Err’. In this situation,
no power is applied to the cooling bath.
The temperature feedback sensor is mounted in the floor of the cooled bath. The temperature
at this point will obviously be different from the temperature at the specimen holder. Over
time this temperature difference will settle to between 1ºC and 2ºC above that of the
measured temperature (depending on conditions).
For the users convenience the set temperature and actual temperature displayed are offset by
1ºC.i.e. A displayed plate temperature of 5ºC will actually be 4ºC.
4. Cleaning & Maintenance
The 7600 Control unit contains no user-serviceable parts and requires no maintenance.
The standard bath assembly requires only cleaning after use.
It must not be sterilised by
autoclaving methods nor must it be immersed in water.
The autoclavable specimen bath is manufactured from a special grade of Nickel-Aluminium
Bronze, a material with excellent corrosion resistance properties. The cooling assembly must
not be autoclaved therefore the bath unit must be separated from it before autoclaving. The
bath is secured to the cooling assembly with 4 stainless steel screws M3 x 35 long. When
fitting the bath to the cooling assembly, the underside of the bath should be smeared with
heat-conducting compound (Campden Instruments model 7600-HTP). The bath should be
then ‘wrung’ onto the cooling head to ensure a good heat transfer path and the screws fitted
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