Merilnik električne prevodnosti vode z uporabo mikroračunalnika Raspberry PI

LUKEŽIČ, ANŽE (author), Maček Lebar, Alenka (mentor)

V vsakdanjem življenju o kvaliteti vode dostikrat ne razmišljamo, saj njeno čistost lahko določamo le po barvi, okusu ter njenemu vonju. Ker je voda dobro topilo, se pogosto uporablja v najrazličnejših laboratorijskih aplikacijah, navadno kot topilo za pripravo standardov ali vzorcev, pri katerih je pomembna njena čistost. Nečistoče, kot so anorganski ioni, organske molekule, bakterije in raztopljeni plini, lahko vplivajo na pridobljene rezultate. Uveljavili so se različni standardi, kot so ASTM®, ISO® 3696,CLSI, Evropska in Ameriška farmakopeja, ki predpisujejo čistost vode za potrebe laboratorijske uporabe. Prav zaradi zagotavljanja čistosti, je potrebno neprestano spremljanje čistosti vode, katera se bo uporabila za nadaljnje analize. Navedenim standardom je skupno, da predpisujejo spremljanje specifične prevodnosti vode, ki je delni pokazatelj njene čistosti. V diplomskem delu je predstavljen merilnik specifične prevodnosti vode, kateri je voden z mikroračunalnikom Raspberry PI. Pridobljeni podatki meritev se beležijo v podatkovno bazo, s pomočjo katere se lahko nadzirajo spremembe, ki so časovno evidentirane.

• Language: Slovenian
• Keywords: merilnik prevodnosti, mikroračunalnik Raspberry Pi, baza podatkov
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-97782
• Publication date in RUL: 10.11.2017

Secondary language

• Language: English
• Title: Water electrical conductivity meter based on the microcomputer Raspberry PI

Abstract

In every day life we usually do not think about water quality, basically because we can determine its quality only on its color, taste or aroma. Because water is a good solvent for preparing analyse samples, it is often used in many analytical applications. That is why it is important to know its impurity, like inorganic ions, organic molecules or bacteria, that can affect our analytical results. Due to laboratory requirements some of the standards, like ASTM®, ISO® 3696,CLSI, European and American pharmacopoeia, are made so that they prescribe the minimum water quality for all analytical purposes. For them it is mandatory to monitor water purity, because it will be used for further analysis. All standards written above have in common, that they prescribe the water purity on its specific conductivity, with which the purity can be defined. In this degree paper I have presented a conductivity meter, which is connected to microcomputer Raspberry PI. The data from conductivity meter is stored in the database that is running on the microcomputer, and it can be then reviewed, to monitor conductivity changes in water.

• Keywords: conductivity meter, microcomputer Raspberry Pi, database