BUCHI Inert Loop B-295 - Manual (Page 61)

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