{"id":154666,"date":"2021-03-01T13:46:10","date_gmt":"2021-03-01T13:46:10","guid":{"rendered":"https:\/\/blog.hannaservice.eu\/elektricna-provodljivost-ec-tds-otklanjanje-problema\/"},"modified":"2022-10-07T14:34:31","modified_gmt":"2022-10-07T14:34:31","slug":"elektricna-provodljivost-ec-tds-otklanjanje-problema","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/sr\/elektricna-provodljivost-ec-tds-otklanjanje-problema\/","title":{"rendered":"Elektri\u010dna provodljivost (EC) \/ TDS Otklanjanje problema"},"content":{"rendered":"\t\t
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Odstupanja \/ pogre\u0161na o\u010ditanja<\/h3>\n

\n<\/h3>\n

 <\/p>\n

Je li vam sonda prljava?<\/strong><\/p>\n

Ovisno o va\u0161em uzorku, naslage bi se mogle zalijepiti za sondu.
\nRedovito \u010distite sondu kako biste sprije\u010dili nakupljanje izme\u0111u elektroda
\n(dvoelektrodne sonde) ili za\u010depljenje otvora za odzra\u010divanje (\u010detiriprstene sonde).
\nIsprati sondu izme\u0111u o\u010ditavanja i prije i nakon spremanja kako bi se sprije\u010dilo nakupljanje. Osobito kada radite s vodom, ostaci mo\u017eda ne\u0107e biti vidljivi golim okom, pa kad sumnjate, isperite.<\/p>\n

Je li sonda ispravno postavljena?<\/strong><\/p>\n

Provjerite je li priklju\u010dak sonde pravilno spojen na mjera\u010d (ako koristite sondu s kabelom). Za priklju\u010dke od 3,5 mm osigurajte
\nda je pin umetnut skroz do luka. Za DIN \/ Quick DIN priklju\u010dke dvaput provjerite jesu li igle pravilno postavljene. Ako imate novu \u010detveroprstenu sondu, pogledajte unutar \u010dahure sonde blizu dna. Oko unutarnjeg dijela sonde postoji mali prozirni krug od gume. Ovo \u0107e vam pomo\u0107i da sa\u010duvate sondu tijekom otpreme, ali mo\u017ee ometati va\u0161e o\u010ditanje. Pa\u017eljivo uklonite gumeni \u0161titnik, a zatim ponovno kalibrirajte sondu.<\/p>\n

<\/p>\n

Jeste li odabrali pravu sondu za svoj uzorak?<\/strong>
\nProvjerite je li sonda pravilno potopljena. Dvoelektrodne sonde trebaju biti samo malo potopljene da pokriju plo\u010de. \u010cetveroprstene
\nsonde zahtijevaju da je okrugli otvor iznad prstenova tako\u0111er potopljen. Provjerite ima li najmanje jednog in\u010da prostora izme\u0111u
\nsonda i sa svih strana \u010da\u0161e. Provjerite iskoristivi raspon mjerenja za svoju dvoelektrodnu sondu. Ako je va\u0161 uzorak izvan raspona, potrebna vam je \u010detveroprstena sonda.<\/p>\n

Jeste li kalibrirali?<\/strong><\/p>\n

Pravilno i u\u010destalo umjeravanje je klju\u010dno. Ako se sonda koristi svakodnevno, umjerite je
\nsvaki dan. Ako ne, kalibrirajte sondu prije upotrebe.<\/p>\n

Neto\u010dna o\u010ditanja<\/h3>\n

 <\/p>\n

Efekt polarizacije<\/strong>\u00a0doga\u0111a se kada se nakuplja naboj izme\u0111u dvije elektrode. Ovaj dodatni naboj mo\u017ee uzrokovati da o\u010ditanje EC
\nni\u017ee nego \u0161to se o\u010dekuje. To se mo\u017ee umanjiti pomo\u0107u dvoelektrodnih sondi koje su izra\u0111ene od grafita umjesto od nehr\u0111aju\u0107eg
\n\u010delika. U\u010dinak rubnog polja je kada se mjerno polje, konstantna elektri\u010dna struja, prote\u017ee izvan sonde s \u010detiri prstena. O efektu rubnog polja morate se brinuti samo ako je sonda preblizu stranama spremnika ili cijevi gdje vr\u0161ite mjerenje EC. Dobro pravilo je dr\u017eati sondu barem centimetar od svih povr\u0161ina. Udaljenost potrebna za odr\u017eavanje sonde varira, zato samo provjerite priru\u010dnik.<\/p>\n

Jeste li kalibrirali?<\/strong><\/p>\n

Ako testirate na USP standarde ili na agresivne kemikalije, morat \u0107ete je \u010de\u0161\u0107e kalibrirati. Ako se sonda koristi svakodnevno, umjerite je
\nsvaki dan. Ako ne, kalibrirajte sondu prije upotrebe.
\nJeste li ispravno umjerili? Pogledajte priru\u010dnik za svoj proizvod ili posjetite https:\/\/hannaservice.eu\/best-practices-electrical-conductivity-ec-tds\/<\/p>\n

Jeste li koristili pravi kalibracijski standard?<\/strong>
\nKada radite kalibraciju s jednom to\u010dkom, prvo kalibrirajte u zraku (nulta to\u010dka), a zatim upotrijebljeni kalibracijski standard treba biti \u0161to bli\u017ei stvarnoj koncentraciji va\u0161eg uzorka. Ako koncentracija uzorka redovito varira u \u0161irokom rasponu, mo\u017eda \u0107e vam trebati sonda i mjera\u010d koji mogu kalibrirati vi\u0161estruke standarde za ve\u0107u to\u010dnost.<\/p>\n

Toplinska ravnote\u017ea<\/strong>
\n\u010cak i uz kompenzaciju temperature, potrebno je vrijeme da sonda postigne stabilizirano temperaturno stanje. Obavezno dopustite nekoliko minuta da sonda postigne ovu ravnote\u017eu.<\/p>\n

Mjehuri\u0107i zraka<\/strong>\u00a0mogu o\u0161tetiti o\u010ditanja, jer osjetljivi dijelovi sondi mo\u017eda ne\u0107e biti u kontaktu s uzorkom. Nje\u017eno
\nzakrenite sondu i \/ ili potapkajte sondu na dnu \u010da\u0161e. To bi trebalo biti dovoljno za osloba\u0111anje zarobljenih mjehuri\u0107a.<\/p>\n

Mo\u017eda je ono \u0161to je u va\u0161em analitu neionsko.<\/strong>\u00a0Nisu sve stvari zbog kojih se TDS raspada na ione dok su u otopini. Dvaput provjerite da li se va\u0161 analit raspada na ione kada je u otopini. Ako ne postaju ionski, mogu se poku\u0161ati i druge metode ispitivanja<\/p>\n\n<\/colgroup>\n\n\n\n\n\n
Code<\/td>\nEC Value @25\u00b0C<\/td>\nCode<\/td>\nEC Value @25\u00b0C<\/td>\n<\/tr>\n
HI7033L<\/a><\/td>\n84 \u03bcS\/cm<\/td>\nHI7030L<\/a><\/td>\n12880 \u03bcS\/cm<\/td>\n<\/tr>\n
HI7031L<\/a><\/td>\n1413 \u03bcS\/cm<\/td>\nHI7034L<\/a><\/td>\n80000 \u03bcS\/cm<\/td>\n<\/tr>\n
HI7039L<\/a><\/td>\n5000 \u03bcS\/cm<\/td>\nHI7035L<\/a><\/td>\n111800 \u03bcS\/cm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Sonda se ne\u0107e kalibrirati<\/h3>\n

Kontaminirani standard<\/strong>
\nNe zaboravite da standardi za umjeravanje nemaju puferski kapacitet. Try taking some new\/clean beakers and pouring fresh standard into each. Zatim upotrijebite jednu \u010da\u0161icu kao dodatno \u201cispiranje\u201d kako bi se kalibracijski standard odr\u017eao \u0161to je mogu\u0107e vi\u0161e bez one\u010di\u0161\u0107enja.<\/p>\n

Kontaminirana voda za ispiranje<\/strong><\/p>\n

EC sonde su vrlo osjetljive, a kao \u0161to je ve\u0107 spomenuto, kalibracijski standardi lako se kontaminiraju. Ustajala voda za ispiranje ili voda iz slavine mo\u017ee unijeti ne\u010disto\u0107e. Mo\u017ee se koristiti destilirana voda, a s tim da je deionizirana voda najbolja opcija.<\/p>\n

Skladi\u0161tenje sonde<\/strong><\/p>\n

EC sonde trebaju se skladi\u0161titi suhe osim ako nisu kombinacija EC \/ pH sonde. Ako imate kombiniranu sondu, sondu je potrebno pohraniti u otopinu za skladi\u0161tenje HI70300 kako bi se sonda pH stakla hidrirala i odr\u017eala u radnom modu. Svakako temeljito isperite sondu
\nprije nego \u0161to obavite EC umjeravanje.<\/p>\n

 <\/p>\n

 <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Odstupanja \/ pogre\u0161na o\u010ditanja   Je li vam sonda prljava? Ovisno o va\u0161em uzorku, naslage […]<\/p>\n","protected":false},"author":17,"featured_media":3277,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[377],"tags":[133,253],"class_list":["post-154666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laboratorija","tag-ebooks","tag-ec-sr"],"yoast_head":"\nElektri\u010dna provodljivost (EC) \/ TDS Otklanjanje problema - Hanna Instruments Srbja<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.hannaservice.eu\/sr\/elektricna-provodljivost-ec-tds-otklanjanje-problema\/\" \/>\n<meta property=\"og:locale\" content=\"sr_RS\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Elektri\u010dna provodljivost (EC) \/ TDS Otklanjanje problema - Hanna Instruments Srbja\" \/>\n<meta property=\"og:description\" content=\"Odstupanja \/ pogre\u0161na o\u010ditanja   Je li vam sonda prljava? 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