BUCHI Multivapo P-12 - Manual (Page 47)

6 Operation
47 Multivapor™ Operation Manual, Version E
6 .1 .1 Selecting a preset temperature
A preset temperature setting ensures that the heating bath temperature cannot be changed either
accidentally or deliberately during the evaporation process.
To switch to the preset mode, proceed as follows:
• Switch off the instrument.
• Turn the adjusting knob to the 95 °C (max) position.
• Switch on the instrument. The set temperature setting flashes on the display.
• Turn the knob to the desired set temperature, e.g. 60 °C within 10 seconds and wait until the set
temperature setting stops flashing.
• This set temperature is now retained whenever the heating bath is switched on and cannot be
changed with the adjusting knob anymore.
6 .1 .2 Changing/switching off the preset temperature
To change or switch off the preset temperature, proceed as follows:
• Switch off the instrument.
• Turn the adjusting knob to the 0 °C (min) position.
• Switch on the instrument. The preset temperature setting is now deleted and the temperature can
be selected via the knob again.
6 .1 .3 Setting the rotational speed
! CAUTION
Risk of minor or moderate injuries due to wrong rotation speed adjustment!
• Do not exceed 370 rpm if using the P-12 platform with the P-6 configuration. Otherwise
strong vibration will damage the P-12 and glass cylinders.
NOTE
As soon as the power plug is connected and the main switch is turned on, the platform moves hori-
zontally in an orbital manner according to the setting adjusted at the corresponding knob.
The rotational speed of the moving platform ranges from 0 to 370 rpm for the Multivapor P-6 and from
0 to 485 rpm for the Multivapor P-12. Within this range even fairly viscous samples are thoroughly
agitated by strong vortex action. For most applications a constant rotational speed at position 8 is
sufficient.
The absolute value of the rotational speed is not displayed. The indication 0…10 on the platform
is linearly increasing from 0 corresponding to 0 rpm to 10 corresponding to 370 rpm or 485 rpm,
respectively.
NOTE
Once optimized, the vortex action remains constant throughout the evaporation process, given that
the shape and inner diameter of the sample tubes is constant. Changing glassware geometries, e.g.
to conical bottoms (the so-called Falcon tubes) or rounded tubes, may alter the efficiency of agita-
tion which may result in boiling retardation. It is therefore advisable to adjust the rotational speed
during the process.