{"id":8234625,"date":"2026-10-24T17:30:18","date_gmt":"2026-10-24T17:30:18","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234625"},"modified":"2026-10-24T17:32:43","modified_gmt":"2026-10-24T17:32:43","slug":"rohuandurid","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/et\/juhendid\/rohuandurid\/","title":{"rendered":"R\u00f5huandur, r\u00f5husaatja v\u00f5i r\u00f5hul\u00fcliti \u2013 kuidas valida"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>R\u00f5huandur, r\u00f5husaatja v\u00f5i r\u00f5hul\u00fcliti \u2013 kuidas valida<\/h1>\n<p class=\"g-lead\">R\u00f5huandur muudab \u00f5li, \u00f5hu, vee v\u00f5i gaasi r\u00f5hu elektriliseks signaaliks. Selgitame, mille poolest erinevad r\u00f5humuundur, r\u00f5husaatja ja r\u00f5hul\u00fcliti, mida t\u00e4psusn\u00e4itaja tegelikult h\u00f5lmab ja kuidas v\u00e4ltida levinud vigu.<\/p>\n<div class=\"g-short\"><b class=\"t\">L\u00fchidalt<\/b><\/p>\n<ul>\n<li><b>V\u00f5rdlusr\u00f5hk<\/b> \u2013 otsusta k\u00f5igepealt, millega r\u00f5hku v\u00f5rreldakse: v\u00e4lis\u00f5huga (\u00fcler\u00f5hk), vaakumiga (absoluutr\u00f5hk) v\u00f5i teise r\u00f5huga (r\u00f5huvahe).<\/li>\n<li><b>Saatja v\u00f5i l\u00fcliti<\/b> \u2013 r\u00f5husaatja annab m\u00f5\u00f5tesignaali, n\u00e4iteks 4\u201320 mA, 0\u201310 V v\u00f5i CAN. R\u00f5hul\u00fcliti lihtsalt l\u00fclitab kontakti seatud r\u00f5hul.<\/li>\n<li><b>M\u00f5\u00f5tepiirkond<\/b> \u2013 rusikareegel: normaalne t\u00f6\u00f6r\u00f5hk v\u00f5iks olla 50\u201375 % m\u00f5\u00f5tepiirkonnast. Kontrolli \u00fclekoormusr\u00f5hku r\u00f5hul\u00f6\u00f6kide suhtes.<\/li>\n<li><b>T\u00e4psus<\/b> \u2013 v\u00f5rdle koguviga kogu temperatuurivahemikus, mitte ainult lineaarsust toatemperatuuril.<\/li>\n<li><b>Materjalid<\/b> \u2013 otsustab keskkond: roostevaba teras, keraamika v\u00f5i plast ning tihend, mis talub m\u00f5\u00f5detavat vedelikku.<\/li>\n<\/ul>\n<\/div>\n<h2>\u00dcler\u00f5hk, absoluutr\u00f5hk v\u00f5i r\u00f5huvahe?<\/h2>\n<p>Iga r\u00f5hku m\u00f5\u00f5detakse mingi v\u00f5rdlusr\u00f5hu suhtes. <b>\u00dcler\u00f5hku<\/b> m\u00f5\u00f5detakse \u00fcmbritseva \u00f5hu suhtes \u2013 seda n\u00e4itab h\u00fcdros\u00fcsteemi v\u00f5i suru\u00f5huliini manomeeter. <b>Absoluutr\u00f5hku<\/b> m\u00f5\u00f5detakse vaakumi suhtes ja seda kasutatakse siis, kui \u00f5hur\u00f5hu muutused ei tohi n\u00e4itu m\u00f5jutada, n\u00e4iteks vaakumprotsessides, baromeetrilisel m\u00f5\u00f5tmisel ja gaaside segamisel. <b>R\u00f5huvahe<\/b> ehk diferentsiaalr\u00f5hk on kahe \u00fchenduse r\u00f5hkude vahe, n\u00e4iteks \u00fcle filtri, ventilaatori v\u00f5i vooluhulga m\u00f5\u00f5tmiseks kasutatava m\u00f5\u00f5teava.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-tryck-f1-et.webp\" alt=\"Kolm m\u00f5\u00f5teelementi: \u00fcler\u00f5hku m\u00f5\u00f5detakse v\u00e4lis\u00f5hu suhtes, absoluutr\u00f5hku vaakumi suhtes ja r\u00f5huvahet kahe \u00fchenduse vahel\" width=\"1520\" height=\"500\" loading=\"lazy\" decoding=\"async\"><figcaption>V\u00f5rdlusr\u00f5hk m\u00e4\u00e4rab, mida andur m\u00f5\u00f5dab: v\u00e4lis\u00f5hku, vaakumit v\u00f5i teist r\u00f5hku.<\/figcaption><\/figure>\n<div class=\"g-short\">\n<p style=\"margin:0\">\u00dchikud: 1 bar = 100 kPa = 0,1 MPa ja 1 psi on umbes 69 mbar. USA andmelehtedel kasutatakse t\u00e4hiseid psig (\u00fcler\u00f5hk), psia (absoluutr\u00f5hk) ja psid (r\u00f5huvahe).<\/p>\n<\/div>\n<h2>R\u00f5humuundur, r\u00f5husaatja v\u00f5i r\u00f5hul\u00fcliti \u2013 mis vahe neil on?<\/h2>\n<ul>\n<li><b>R\u00f5humuundur<\/b> \u2013 m\u00f5\u00f5teelement lihtsa signaaliga, sageli m\u00f5ni millivolt toitepinge volti kohta (mV\/V). Signaali tuleb v\u00f5imendada.<\/li>\n<li><b>R\u00f5husaatja<\/b> \u2013 sisseehitatud elektroonika ja standardse v\u00e4ljundiga andur. Just seda peab enamik inimesi t\u00e4nap\u00e4eval r\u00f5huanduri all silmas.<\/li>\n<li><b>R\u00f5hul\u00fcliti<\/b> \u2013 l\u00fclitab kontakti, kui r\u00f5hk \u00fcletab seatud piiri. Mehaaniline l\u00fcliti ei vaja toidet, elektroonilisel on sageli lisaks analoogsignaal.<\/li>\n<\/ul>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-tryck-f2-et.webp\" alt=\"Plokkskeem: r\u00f5humuundur annab n\u00f5rga millivoltsignaali, r\u00f5husaatjal on elektroonika, mis annab standardsignaali, ja r\u00f5hul\u00fcliti l\u00fclitab kontakti seatud punktis\" width=\"1520\" height=\"472\" loading=\"lazy\" decoding=\"async\"><figcaption>Sama m\u00f5\u00f5teelement v\u00f5ib olla r\u00f5humuunduris, r\u00f5husaatjas v\u00f5i r\u00f5hul\u00fclitis. Signaali m\u00e4\u00e4rab elektroonika.<\/figcaption><\/figure>\n<p>Vali l\u00fcliti, kui on vaja teada ainult seda, kas r\u00f5hk on liiga k\u00f5rge v\u00f5i liiga madal \u2013 madal \u00f5lir\u00f5hk, ummistunud filter, suru\u00f5hu r\u00f5hulangus. Vali r\u00f5husaatja, kui juhts\u00fcsteem peab r\u00f5hku reguleerima, logima v\u00f5i andma h\u00e4ireid mitmel tasemel. Ohutusfunktsioonide jaoks on saadaval l\u00fclitid, mis on hinnatud standardite IEC 61508 (SIL) ja ISO 13849 (PL) j\u00e4rgi.<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>V\u00e4ljund<\/th>\n<th>Eelis<\/th>\n<th>Pea meeles<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">4\u201320 mA<\/td>\n<td>Talub pikki kaableid ja h\u00e4ireid. Katkenud juhe on kohe n\u00e4ha, sest nullpunkt on 4 mA.<\/td>\n<td>Toide tuleb sageli samade kahe juhtme kaudu. Kontrolli koormustakistust.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">0\u201310 V<\/td>\n<td>Lihtne sisse lugeda.<\/td>\n<td>Tundlik h\u00e4irete ja pingelangu suhtes pikkades kaablites.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Ratsiomeetriline<\/td>\n<td>Levinud s\u00f5idukites. Signaal on osa toitepingest, nt 10\u201390 %.<\/td>\n<td>Kontroller peab kasutama v\u00f5rdluseks sama toidet.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">CANopen, SAE J1939<\/td>\n<td>Palju andureid \u00fchel siinil, koos diagnostikaga.<\/td>\n<td>Seadista aadress ja siini l\u00f5petustakisti \u00f5igesti.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">IO-Link<\/td>\n<td>Seadistused ja diagnostika tavalise andurikaabli kaudu (IEC 61131-9).<\/td>\n<td>Vajab IO-Link-masterit.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>M\u00f5\u00f5tepiirkond, \u00fclekoormus ja r\u00f5hul\u00f6\u00f6gid<\/h2>\n<p>M\u00f5\u00f5tepiirkond peab katma normaalse t\u00f6\u00f6r\u00f5hu koos varuga. Liiga suur m\u00f5\u00f5tepiirkond annab baarides suurema vea, sest viga on protsent m\u00f5\u00f5tepiirkonna \u00fclemisest piirist (FS). \u00b10,5 % FS on 600-baarise anduri puhul \u00b13 bar ka siis, kui m\u00f5\u00f5dad 20 bar.<\/p>\n<p>Andmelehel on toodud ka <b>\u00fclekoormusr\u00f5hk<\/b>, mida andur talub ilma p\u00fcsiva muutuseta, ja <b>purunemisr\u00f5hk<\/b>, mille juures andur puruneb. Nende vahel v\u00f5ib anduri nullpunkt j\u00e4\u00e4davalt nihkuda.<\/p>\n<p>R\u00f5hul\u00f6\u00f6gid on h\u00fcdros\u00fcsteemides ja vees\u00fcsteemides \u00fcks sagedasemaid p\u00f5hjusi, miks andurid rikki l\u00e4hevad. Kui klapp sulgub kiiresti, v\u00f5ib r\u00f5hk m\u00f5ne millisekundi jooksul t\u00f5usta mitu korda \u00fcle normaalse taseme \u2013 liiga kiiresti, et manomeeter seda n\u00e4itaks. Anduri \u00fchenduses olev drossel (summuti) summutab r\u00f5hupiigi. Kavitatsioon, kus aurumullid kokku langevad, p\u00f5hjustab nii r\u00f5hul\u00f6\u00f6ke kui ka erosiooni. \u00c4ra paigalda andurit vahetult pumba, klapi v\u00f5i ahenduse j\u00e4rele.<\/p>\n<h2>Mida t\u00e4psus h\u00f5lmab?<\/h2>\n<p>Kaks andurit, mille andmelehel on 0,25 %, v\u00f5ivad praktikas tugevalt erineda. Kontrolli, mida see arv h\u00f5lmab:<\/p>\n<ul>\n<li><b>Lineaarsus<\/b> \u2013 k\u00f5rvalekalle sirgest joonest. Kui see on antud BFSL-meetodiga (parim sobituv sirge), on arv v\u00e4iksem kui nullist m\u00f5\u00f5tepiirkonna l\u00f5puni m\u00f5\u00f5detuna.<\/li>\n<li><b>H\u00fcsterees<\/b> \u2013 signaali erinevus samal r\u00f5hul, kui r\u00f5hk t\u00f5useb v\u00f5i langeb.<\/li>\n<li><b>Korratavus<\/b> \u2013 kui h\u00e4sti korduvad m\u00f5\u00f5tmised omavahel kattuvad.<\/li>\n<li><b>Temperatuuriviga<\/b> \u2013 kuidas nullpunkt ja tundlikkus temperatuuriga muutuvad. \u00d5ues ja liikurmasinates on see sageli suurim veakomponent.<\/li>\n<li><b>Pikaajaline stabiilsus<\/b> \u2013 kui palju andur aastas triivib.<\/li>\n<\/ul>\n<p>K\u00f5ige kasulikum n\u00e4itaja on <b>koguveariba<\/b> kogu kompenseeritud temperatuurivahemikus. See \u00fchendab k\u00f5ik eelnevad komponendid ja n\u00e4itab, kui palju n\u00e4it v\u00f5ib tegelikult k\u00f5rvale kalduda.<\/p>\n<h2>Keskkond, materjalid ja paigaldus<\/h2>\n<p>K\u00f5ik m\u00f5\u00f5detava ainega kokkupuutuvad osad peavad seda keskkonda taluma. Roostevaba teras 316L sobib enamikule \u00f5lidele, veele ja gaasidele. Keraamilised m\u00f5\u00f5teelemendid taluvad paljusid agressiivseid keskkondi ning \u00fclipuhaste protsesside ja tugevate hapete jaoks on l\u00fcliteid, mille keskkonnaga kokkupuutuvad osad on PFA-st ja PTFE-st. Kontrolli ka tihendit: FKM, EPDM ja NBR sobivad eri vedelikele ning t\u00e4ielikult keevitatud anduritel tihendit \u00fcldse pole.<\/p>\n<ol class=\"g-pit\">\n<li><b>Vale asukoht torul.<\/b> Vedelike puhul paigalda andur toru k\u00fcljele, et membraani juurde ei koguneks \u00f5hku ega settiks muda. Gaasi puhul paigalda andur toru peale, et kondensaat saaks \u00e4ra voolata.<\/li>\n<li><b>Ummistunud \u00f5hutusava.<\/b> \u00dcler\u00f5huandur vajab \u00fchendust v\u00e4lis\u00f5huga kaabli v\u00f5i \u00f5hutusava kaudu. Kui v\u00e4rv v\u00f5i vesi selle ummistab, hakkab n\u00e4it j\u00e4rgima \u00f5hur\u00f5hku ja temperatuuri.<\/li>\n<li><b>Kuum aur otse andurile.<\/b> Sifoon v\u00f5i jahutustoru kaitseb andurit auru ja andmelehel lubatust kuumema keskkonna eest.<\/li>\n<li><b>\u00dcle pingutatud liitmik.<\/b> Liiga tugevalt pingutatud keere v\u00f5ib korpust deformeerida ja nihutada nullpunkti, eriti madalr\u00f5huanduritel. J\u00e4rgi etten\u00e4htud pingutusmomenti.<\/li>\n<\/ol>\n<h2>Kus r\u00f5huandureid ja r\u00f5hul\u00fcliteid kasutatakse?<\/h2>\n<ul>\n<li><b>Liikurmasinad<\/b> \u2013 h\u00fcdraulikar\u00f5hk kraanades, metsamasinates ja frontaallaadurites koormuse arvutamiseks, \u00fclekoormuskaitseks ja juhtimiseks.<\/li>\n<li><b>Tehased<\/b> \u2013 suru\u00f5hk, m\u00e4\u00e4rimine, jahutusvesi ja h\u00fcdraulilised pressid. L\u00fcliti peatab masina, kui \u00f5lir\u00f5hk langeb liiga madalale.<\/li>\n<li><b>Energeetika ja vesi<\/b> \u2013 kaugk\u00fcte, soojuspumbad, pumbajaamad ja h\u00fcdroelektrijaamade h\u00fcdraulika.<\/li>\n<li><b>Plasti- ja toiduainet\u00f6\u00f6stus<\/b> \u2013 sulamir\u00f5hk ekstruuderites ja survevalumasinates ning h\u00fcgieenilised andurid survepesu tingimustesse.<\/li>\n<li><b>Lennundus ja kaitset\u00f6\u00f6stus<\/b> \u2013 keevitatud, hermeetiliselt suletud andurid ja l\u00fclitid juhtimiss\u00fcsteemidele, piduris\u00fcsteemidele ja telikutele.<\/li>\n<\/ul>\n<h2>R\u00f5huandurid ja r\u00f5hul\u00fclitid SCN-ilt<\/h2>\n<p>Meie valikus on Huba Controli r\u00f5husaatjad liikurmasinate h\u00fcdraulikale ning Precision Sensorsi, Sensata ja Nominal Controlsi andurid ja l\u00fclitid \u00fclipuhastele gaasidele, lennundusele ja protsessit\u00f6\u00f6stusele. Kirjuta meile m\u00f5\u00f5detav keskkond, r\u00f5hk, signaal ja t\u00f6\u00f6tingimused \u2013 aitame sul valida.<\/p>\n<h3>N\u00e4ited meie valikust<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/et\/toode\/604-rohuandur\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/pic_604.jpg\" alt=\"Huba Control 604 R\u00f5huandur\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Huba Control<\/span><span class=\"g-pn\">604 R\u00f5huandur<\/span><span class=\"g-pw\">R\u00f5huvahel\u00fcliti ventilatsioonile: j\u00e4lgib filtreid ja ventilaatoreid ning kaitseb k\u00fcttekaloriferi \u00fclekuumenemise eest.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/et\/toode\/staset-sil-3-pressure-switch-transducer-et\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/precision-sensors-staset-main.webp\" alt=\"Precision Sensors Staset SIL 3 r\u00f5hul\u00fcliti ja r\u00f5huandur\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Precision Sensors<\/span><span class=\"g-pn\">Staset SIL 3 r\u00f5hul\u00fcliti ja r\u00f5huandur<\/span><span class=\"g-pw\">L\u00fcliti, r\u00f5huandur ja n\u00e4idik \u00fches seadmes. L\u00fclitusv\u00e4ljund sobib SIL 3 (IEC 61508) ja PL e (ISO 13849) rakendustesse.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/et\/toode\/px500-et\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/PX500.png\" alt=\"Sensata PX500 r\u00f5huandur\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Sensata<\/span><span class=\"g-pn\">PX500 r\u00f5huandur<\/span><span class=\"g-pw\">Sensata r\u00f5huandur temperatuurivahemikule \u221255 kuni 150 \u00b0C.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/sensors-et\/pressure-sensors\/\">R\u00f5huandurid ja r\u00f5husaatjad<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/sensors-et\/pressure-sensors\/pressure-sensors-mobile\/\">R\u00f5huandurid liikurmasinatele<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/sensors-et\/pressure-sensors\/pressure-switches-et\/\">R\u00f5hul\u00fclitid<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/network-products-et\/can-interfaces-et\/\">CAN-liidesed<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/connectors-and-cables-et\/\">Pistikud ja kaablid<\/a><\/div>\n<div class=\"g-cta\">\n<p>Pole kindel m\u00f5\u00f5tepiirkonnas, signaalis v\u00f5i materjalides? K\u00fcsi meie inseneridelt \u2013 saad vastuse 24 tunni jooksul.<\/p>\n<p><a href=\"https:\/\/scn.eu\/et\/kontakt\/\">K\u00fcsi inseneri k\u00e4est<\/a><\/div>\n<h2>Korduma kippuvad k\u00fcsimused<\/h2>\n<details>\n<summary>Mis vahe on r\u00f5humuunduril ja r\u00f5husaatjal?<\/summary>\n<p>R\u00f5husaatjal on sisseehitatud elektroonika, mis annab standardse v\u00e4ljundsignaali, n\u00e4iteks 4\u201320 mA. R\u00f5humuundur annab rangelt v\u00f5ttes n\u00f5rga millivoltsignaali, mida tuleb v\u00f5imendada. Praktikas kasutatakse neid m\u00f5isteid sageli segamini.<\/p>\n<\/details>\n<details>\n<summary>Kas valida 4\u201320 mA v\u00f5i 0\u201310 V?<\/summary>\n<p>4\u201320 mA talub paremini h\u00e4ireid ja pikki kaableid ning katkenud juhe on kohe n\u00e4ha, sest vool langeb alla 4 mA. 0\u201310 V t\u00f6\u00f6tab h\u00e4sti l\u00fchikestel vahemaadel masina v\u00f5i juhtkilbi sees.<\/p>\n<\/details>\n<details>\n<summary>Kuidas valida r\u00f5huanduri m\u00f5\u00f5tepiirkonda?<\/summary>\n<p>Normaalne t\u00f6\u00f6r\u00f5hk v\u00f5iks olla umbes 50\u201375 % m\u00f5\u00f5tepiirkonnast ja r\u00f5hul\u00f6\u00f6gid peavad j\u00e4\u00e4ma alla \u00fclekoormusr\u00f5hu. Liiga suur m\u00f5\u00f5tepiirkond annab baarides suurema vea.<\/p>\n<\/details>\n<details>\n<summary>Miks mu r\u00f5huandur triivib?<\/summary>\n<p>Levinud p\u00f5hjused on \u00fclekoormusr\u00f5hku \u00fcletavad r\u00f5hul\u00f6\u00f6gid, temperatuur v\u00e4ljaspool kompenseeritud vahemikku, ummistunud \u00f5hutusava v\u00f5i \u00fcle pingutatud liitmik.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>R\u00f5huandur muudab \u00f5li, \u00f5hu, vee v\u00f5i gaasi r\u00f5hu elektriliseks signaaliks. Selgitame, mille poolest erinevad r\u00f5humuundur, r\u00f5husaatja ja r\u00f5hul\u00fcliti, mida t\u00e4psusn\u00e4itaja tegelikult h\u00f5lmab ja kuidas v\u00e4ltida levinud vigu.<\/p>\n","protected":false},"author":11,"featured_media":8234523,"template":"","meta":{"_yoast_wpseo_focuskw":"r\u00f5huandur","_yoast_wpseo_metadesc":"R\u00f5huandur, r\u00f5husaatja v\u00f5i r\u00f5hul\u00fcliti? Kuidas valida v\u00f5rdlusr\u00f5hk, m\u00f5\u00f5tepiirkond, v\u00e4ljund ja materjalid ning v\u00e4ltida r\u00f5hul\u00f6\u00f6ke ja vigu. 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