Instruction Manual

7 Maintenance and repairs

61 B-290 Operation Manual, Version I

7.8 Replacing the oxygen sensor of the Inert Loop B-295

After approximately 2 years of operation the oxygen concentration displayed by the sensor decreases

drastically.

The sensor should now be replaced. For this purpose:

• Open the front plate with an allen key.

• Disconnect the cable by turning the plug.

• Screw the sensor out and replace it by a new one.

• Reconnect the cable.

• Calibrate the sensor according to chapter 7.6, Cali-

brating the oxygen sensor.

Fig. 7.3: Replacing the oxygen sensor

7.9 Spray chilling accessory

Prior to cleaning, let the spray chilling accessory cool down with its covers on.

For cleaning, proceed as follows:

• Fill the spray chilling accessory with the cleaning agent and open the needle valve.

• If the accessory is blocked remove it.

• Use hot water, soap solutions and a brush for cleaning.

• Put the blocked metal parts in a heating oven to melt the stocked product.

• Wash all parts with water and let them dry.

• The silicone tubing between the spray chilling accessory and the nozzle has to be replaced if it is

blocked or broken.

7.10 Customer service

Only authorised service personnel are allowed to perform repair work on the instrument. These

persons have a comprehensive technical training and knowledge of possible dangers which might

arise from the instrument.

Addresses of ofﬁcial BUCHI customer service ofﬁces are given on the BUCHI website under:

www.buchi.com. If malfunctions occur on your instrument or you have technical questions or applica-

tion problems, contact one of these ofﬁces.

The customer service offers the following:

• Spare part delivery

• Repairs

• Technical advice