BUCHI SpeedDigester K-439 - Manual (Page 53)

7 Maintenance and repairs
53 K-439 Operation Manual, Version A
7 .3 Glass component conditions
Clean the glass components after each working process to prolong their lifetime. The glass assem-
blies can be taken out and cleaned manually with water and a commercial cleaning agent (e.g. mild
soap solution) or in an ultrasonic bath. Visibly check for damages at all the glass components subse-
quently.
Note
It is recommended to clean all glass components in use. •
Regularly check the glassware components for damage and use only glassware in perfect condi- •
tion, i.e. glassware without cracks or stars.
7 .3 .1 Sample tubes
Do not use cold water to cool down the sample tubes after digestion. The resulting temperature shock
might lead to tension and cracks in the glass.
Make sure that the sample tubes are placed as illustrated in the laboratory washing instrument (see
drawing). Thus the tubes will not be damaged during washing.

7 .4 Sealing system
Regularly clean and inspect the sealings for possible damage as described in section 7.2. The seal-
ings are expendable items and must be replaced if they are damaged or no longer seal properly.
NOTICE
Risk of sealing damage by lubricants or sharp objects.
Do not lubricate sealings •
Do not bring sealings in contact with sharp objects •
Use ethanol or soapy water as detergent only •
To prolong the lifetime of the seals, rinse them routinely with water and always when there has been