De or het apparaatinstelling?

The correct Dutch article is:

de apparaatinstelling

Rule Words ending in -ing: almost always de. See the rule

How to use apparaatinstelling

the apparaatinstellingde apparaatinstelling
this apparaatinstellingdeze apparaatinstelling
that apparaatinstellingdie apparaatinstelling
our apparaatinstellingonze apparaatinstelling
your apparaatinstellingjouw apparaatinstelling
every apparaatinstellingelke apparaatinstelling
which apparaatinstelling?welke apparaatinstelling?
a big apparaatinstelling / the big apparaatinstellingeen grote apparaatinstelling, de grote apparaatinstelling