7. Maintenance
The accurate horizontally levelling should be checked every day as well as the clearness of the lupolene
domes. The receiver plates have to be black.
Lupolene domes: Lupolene domes should be cleaned very cautiously from time to time. Light scratches do
not influence measurement.
Note: Damaged or perforated domes have to be changed immediately. They can be exchanged very easily
by removal of screw rings and fixing rings.