3000R Refrigeration - Fisher Scientific MARATHON 3000 Operation Manuals

3.5 Refrigeration (3000R only)
Refrigerated units refrigerate the rotor chamber whenever
the cover is closed and the unit is switched on.
Refrigeration is applied, as necessary, to cool the rotor
chamber to the currently displayed temperature setting. If
you use the key pad, and momentarily display a cold
temperature (stepping through stored programs, for
example), refrigeration will not be activated.
If the rotor chamber is not at the specified temperature, it
will not abort the spin. However, if the rotor chamber
differs, at the start of a run, by more than 5°C, from the
specified temperature. The °C display will switch between
the actual and set/programmed temperatures, until the two
temperatures come within 5°C. Press the STOP key, if the
run should not continue at the actual temperature.
The unit is not designed for use as a refrigerator. The
natural fanning action of the rotor serves to maintain a
uniform temperature distribution inside the chamber. At
zero RPM, there is no correlation between set and actual
chamber temperatures.
Any frost or condensation, that forms in the rotor chamber,
should be removed. Allow it to melt, and remove it with a
sponge or cloth. When the centrifuge is not in use, turn it
off, or leave the cover open (to disable refrigeration).
MARATHON Series Operation Manual
22
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com