Engels naar Nederlands Techniek Werktuigbouwkunde / mechanische techniek Gas monitoring device

5.1.1 Routine maintenance
XXX gas monitors have no moving parts and require no *** consumables ***. For best
performance, however, we recommend to routinely carry out the follows steps:
Check optical transmission regularly (daily). This can be done automatically by use
of instrument output or WARNING relay or similar.
Clean windows and adjust alignment when necessary.