Buchi Rotavapo R II Manual do Utilizador descarregar pdf (Página 40)

8 Troubleshooting

40 R II Operation Manual, Version E

Table 8-1: General malfunction and their remedy

Malfunction Possible cause Corrective measure

Seal is defective Replace seal

Table 8-2: Malfunctions with vacuum controller and vacuum pump and their remedy

Malfunction Possible cause Corrective measure

Frequent switching of valve or pump System is leaky Check all sealing points (tubes and

their connections)

Chosen hysteresis is too small Choose larger hysteresis (if end-

vacuum is higher than 700 mbar,

switch to automatic hysteresis)

Vacuum is not reached Back evaporation at Rotavapor Empty receiving ﬂask

Water pressure of water jet pump is

too low

Open water tap completely

Distillation “died out” Manually decrease the pressure until

the distillation starts again

Distillation stopped, although not

dried out completely

Back evaporation from the receiving

ﬂask is too strong (especially for

solvent mixtures)

Empty receiving ﬂask and restart

distillation

Malfunction in distillation procedure

which is not exactly deﬁned (e.g.

sudden cooling, heat ﬂow too low,

etc.)

Decrease the pressure manually until

the distillation starts again

NOTE

At the R II no errors are displayed and read out via the RS485 interface.

Reset of the overtemperature sensor at the bottom of the Heating bath B-491

Let the bath cool down and empty it. Then

push the temperature sensor reset button at

the bottom side of the heating bath e.g. by

means of a tooth stick.

Fig. 8.1: Heating bath B-491 bottom view

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 57 58

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Buchi Rotavapo R II Manual do Utilizador Página 40