Urwego rwohereza amazi ni ubushyuhe bwo hejuru bwa gazi iyobowe na transmitter, ihuza sensor na sisitemu yo gutunganya ibimenyetso mumasanduku. Igishushanyo cyemerera sensor guhura na gaze yibijwe muri karitsiye, hanyuma ikohereza gaze mubintu byunvikana binyuze mumiyoboro ya impulse. Ibicuruzwa bishya bikemura ibibazo bijyanye no gupima ubushyuhe bwo hejuru bwamazi wirinda guhura hagati ya sensor nuburyo bupimwa. Ibipimo byo kwibiza byateguwe byumwihariko kugirango bikenure gukenera urugero rwamazi mubushyuhe bwinshi cyangwa amazi yangirika cyane. Ibiranga bidasanzwe bituma biba byiza kubisabwa bisaba ibipimo bito n'ibiciriritse bipima n'ibidukikije hamwe nibitangazamakuru byangirika cyane. Kimwe mu byiza byingenzi byo gupima urwego rwo kwibiza ni ubushobozi bwo gupima urugero rwamazi mubushyuhe bwo hejuru. Uburyo bwa tekinike yo gupima urwego rwamazi akenshi birarwana no kumenya neza urwego rwamazi mubushyuhe bukabije bitewe nubushobozi buke bwa sensor. Ariko, hamwe nugupima urwego rwo kwibiza, sensor ntabwo ihura neza nuburyo bupimwa. Ahubwo, ikorana na gaze iri muri silinderi yibiza, ikora nka bariyeri yo gukingira. Ubu buryo butuma ibipimo bifatika kandi byizewe ndetse no mu gihe cy'ubushyuhe bukabije.