Buchi B-491 Bedienungsanleitung

5 Putting into operation

32 R-210/215 Operation Manual, Version F

5 Putting into operation

This chapter describes how the instrument is installed and gives instructions on initial startup.

NOTE

Inspect the instrument for damages during unpacking. If necessary, prepare a status report immedi-

ately to inform the postal company, railway company or transportation company.

Keep the original packaging for future transportation.

5.1 Installation site

Place the instrument on a stable, horizontal plane and consider the maximum product dimensions.

Perform the distillations under vacuum with the Rotavapor placed under a fume hood. If this is not

possible due to shortage of space, mount the protective shield (optional accessory) and lead the

exhaust gas from the pump into the fume hood.

5.2 Electrical connections

ATTENTION

Make sure that the voltage on the socket corresponds to the voltage given on the type plate of the

instrument.

Always connect the instrument to an earthed socket. External connections and extension cables

must be provided with an earthed conductor lead (3-pole couplings, cable or plug equipment) as the

mains lead has a molded plug, thus avoiding risks due to inadvertent defective wiring.

Make sure that no electric sparks form in the instrument or its surroundings as they might damage

the instrument.

5.3 Commissioning the heating bath

Place the bath on the base plate of the Rotavapor.

If you need to adjust the position of the bath, lift

it up slightly at the right-hand side and pull or

push it to the desired position.

Fig. 5.1: Moving the heating bath

5 Putting into operation

33 R-210/215 Operation Manual, Version F

Saving energy

For heating baths there are various ways to save energy. By using ﬂoating balls in the water bath,

evaporation of water is reduced. As a result, the bath heating has to switch on less often. This

measure helps to save up to 50 % of energy. At the same time approximately 70 % less water is used.

Additionally, a cover is available to put over the heating bath during operation which also saves energy

between distillations.

Fig. 5.2: Floating balls in the heating bath medium and cover for heating bath

NOTE

Turn on the heating bath about 10 –15 minutes before starting the distillation, since the bath has a

certain warm-up time. Turn off the heating bath after a distillation.

ATTENTION

As soon as the power plug is connected and the mains switch is turned on, the bath starts heating if

the actual temperature is below the set temperature. For this reason, make sure that there is always

heating medium in the bath to prevent instrument damage.

5.3.1 Heating Bath B-495

The Heating Bath B-495 is delivered with the bath replenishment mounted, see ﬁgure below.

Fig. 5.3: Heating Bath B-495 with water replenishment on the right-hand side

The function and water ﬂux of the Heating Bath B-495 can be seen from the ﬁgure below.

6 Operation

42 R-210/215 Operation Manual, Version F

6 Operation

This chapter explains the operating elements and possible operating modes. It gives instructions on

how to operate the Rotavapor properly and safely.

ATTENTION

Check the glassware for damages prior to each operation and use only glassware in perfect condi-

tion. Glassware with cracks, stars or other damages can break during operation.

6.1 Settings at the heating bath

6.1.1 Setting the heating bath temperature

ATTENTION

As soon as the power plug is connected and the mains switch is turned on, the bath starts heating if

the actual temperature is below the set temperature. For this reason, make sure that there is always

heating medium in the bath to prevent heating bath damage.

WARNING

The heating bath can reach temperatures up to 180 °C. To avoid burns, consider the following:

• Never remove a rotating ﬂask from the bath because splashing oil can result in burns.

• Make sure that no liquid can overﬂow from the bath when the evaporating ﬂask is submerged.

• Install the protective shield (optional accessory) only to a cold heating bath.

6.1.2 Switching the B-491 from water bath mode to oil bath mode

To switch the heating bath from water bath mode

to oil bath mode, proceed as follows:

• Switch off the heating bath.

• Turn the adjusting knob to any position except

for 0 °C or 180 °C.

• Switch on the heating bath.

• As soon as the temperature is indicated on the

display, turn the knob to the 180 °C position

within 3 seconds. The indication “OIL” will now

appear on the display.

Fig. 6.1: Display in oil bath mode

ATTENTION

In the oil bath mode, always operate the bath with oil as the heating medium as water might start

boiling and evaporating which would lead to a heating bath damage.

After the oil bath has been standing opened for a prolonged period, condensation water can accu-

mulate at the bottom. When the bath is used again, it must be heated above 100 °C with rotating

ﬂask to drive the water out.

NOTE

A setting up to 180 °C is only possible in oil bath mode.

6 Operation

43 R-210/215 Operation Manual, Version F

6.1.3 Switching the B-491 from oil bath mode to water bath mode

To switch the heating bath from oil bath mode to

water bath mode, proceed as follows:

• Switch off the heating bath.

• Turn the adjusting knob to any position except

for 0 °C or 180 °C.

• Switch on the heating bath.

• As soon as the temperature is indicated on

the display, turn the knob to the 0 °C position

within 3 seconds. The indication “WATER” will

now appear on the display.

Fig. 6.2: Display in water bath mode

NOTE

In water bath mode, the heating bath can be operated with both water or oil.

A setting up to 95 °C is possible in water bath mode.

6.1.4 Selecting the set temperature

With this setting you can ensure, that the heating bath temperature cannot be changed during the

distillation process.

To carry out the setting, proceed as follows:

• Switch off the heating bath.

• Turn the adjusting knob to the 180 °C/95 °C (max) position.

• Switch on the heating bath. The set temperature setting ﬂashes in the display.

• Turn the knob within 10 seconds to the desired set temperature, e.g. 60 °C and wait until the set

temperature setting stops ﬂashing.

This temperature is now kept whenever the heating bath is switched on and cannot be changed with

the adjusting knob anymore.

6.1.5 Changing/switching off the set temperature

To change or switch off the set temperature, proceed as follows:

• Switch off the heating bath.

• Turn the adjusting knob to the 0 °C (min) position.

• Switch on the heating bath. The set temperature setting is now deleted and the temperature can

be selected via the knob again.

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