A cikin tsarin samar da injinan takarda, ɓangaren litattafan almara na ɗaya daga cikin mahimman kayan da ake samarwa. A lokaci guda kuma, a cikin aikin sarrafa ɓangaren litattafan almara, za a samar da ruwa mai yawa da najasa. A ƙarƙashin yanayi na al'ada, muna amfani da mitoci masu gudana na lantarki don auna kwarara da ƙarar najasa. Idan kuna buƙatar auna canjin canjin ruwa na tankin najasa, muna buƙatar amfani da ma'aunin matakin ultrasonic.
Ana amfani da ma'aunin matakin ultrasonic don auna matakin najasa da ruwa a dakin da zafin jiki da matsa lamba. Irin waɗannan samfuran suna da fa'idodi na ƙarancin farashi, ma'aunin kwanciyar hankali, shigarwa mai dacewa, aminci da karko.
Kamfaninmu ya yi aikin injin takarda a Amurka a watan da ya gabata, wanda ake amfani da shi a cikin irin wannan yanayi. Abokin ciniki yana amfani da ma'aunin matakin ultrasonic don auna matakin ruwa na ɓangaren litattafan almara. A lokaci guda, abokin ciniki yana amfani da 4-20mA mai waya guda biyu don fitarwa mai nisa kuma ya gane saka idanu mai nisa a cikin ɗakin kulawa.
