Swiwitsi swa mpimo wa mafurha/mati i xitirhisiwa xa nkoka xo langutisisa mpimo wa mafurha kumbe mati eka mathangi eka switirhisiwa swo hambana. Yi tirha hiku tirhisa float mechanism leyi fambafambaka na levele ya mati. Loko float yi fika eka mpimo lowu vekiweke ka ha ri emahlweni, yi endla leswaku swiwitsi swi tirha, yi rhumela xikombiso eka fambiselo ro lawula. Xikombiso lexi xinga sungula 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.