BUCHI KjelFlex K-360 - Manual (Page 49)

7 Maintenance
49 KjelFlex K-360 Operation Manual, Version C
7 .1 .3 Cleaning the rubber bung seal
Clean the seal with a damp cloth.
7 .2 Monthly maintenance
7 .2 .1 Calibrating the pumps
We recommend to calibrate the pumps once a month or every 100 distillations. Before calibrating the
pumps, make sure that the hoses are not bent inside the instrument. For a description on how to carry
out the calibration, see chapter 6.4.1.
7 .2 .2 Checking the distillate amount
To check the distillate amount, wait until the steam generator is ready, i.e. the preheating has been
performed. Then run a single sample with an empty tube and an empty receiving vessel with the
following parameters:
Table 7-1: Checking the distillate amount
Parameter Setting
Check distillate amount: Distillation
Sample tube: empty
Water: 0 ml
NaOH: 0 ml
Distillation time: 5:00
Measure the distillate amount by means of a measuring flask. With the above parameters it should be
minimum 130 ml.
7 .3 Maintenance as required
We recommend to replace the parts listed in this chapter depending on the instrument use or at least
once a year.
7 .3 .1 Cleaning the splash protector
Glass splash protector:
It is recommended to unmount the splash protector if residues are visible in its upper part. It can be
cleaned with commercially cleaning agent or in an ultrasonic bath.
Plastic splash protector:
It is recommended to unmount the splash protector if you see the blank values continually increasing.
It can be cleaned with commercially cleaning agent or in an ultrasonic bath.
When unmounting the splash protector for cleaning, clean the seal as well to prolong its lifetime.
Rinse it with water, dry it with a soft cloth, remount it and put the splash protector back in place.