Swiwitsi swa mpimo wa mafurha/mati i xitirhisiwa xa nkoka lexi tirhisiwaka eka switirhisiwa swo hambana ku langutisisa mpimo wa mafurha kumbe mati eka mathangi. Yi tirha hiku tirhisa float mechanism leyi fambafambaka na levele ya mati. Loko float yi fika endhawini leyi vekiweke, yi endla leswaku swiwitsi swi tirha, yi rhumela xikombiso eka fambiselo ro lawula. Xikombiso lexi xinga pfuxa swiendlo swofana naku sungula pompo, ku pfala valve, kumbe ku lemukisa mutirhisi. Swi endliwe hi swilo leswi tiyeke, swiwitsi leswi swi endleriwe ku tiyisela swiyimo swo tika naswona swi ta hi mixaka yo hambana-hambana, yo tanihi michini, capacitive ni ultrasonic, leswaku yi amukela mati yo hambana-hambana ni vukulu bya mathangi.