{"id":1299,"date":"2018-12-19T13:48:21","date_gmt":"2018-12-19T13:48:21","guid":{"rendered":"http:\/\/limit-tools.local\/tips-and-tricks\/about-moisture\/"},"modified":"2019-04-29T08:35:36","modified_gmt":"2019-04-29T08:35:36","slug":"about-moisture","status":"publish","type":"page","link":"https:\/\/limittools.test.consids5.se\/sv\/tips-and-tricks\/about-moisture\/","title":{"rendered":"Vad \u00e4r en fuktm\u00e4tare och hur fungerar den?"},"content":{"rendered":"

[vc_row][vc_column width=”1\/2″][vc_column_text]RELATIV LUFTFUKTUGHET (RF)
\n<\/strong>Luftens fo\u0308rma\u030aga att ta upp vatten varierar med temperaturen. Ju ho\u0308gre temperatur desto mer vatten kan luften absorbera. Fo\u0308r att uttrycka fukttillsta\u030andet i luft anger man den relativa fuktigheten i enheten % RF.[\/vc_column_text][vc_column_text]DAGGPUNKT
\n<\/strong>daggpunkten uttrycks i \u00b0C och anger den temperatur da\u030a luftfuktigheten uppna\u030ar 100 % rF och vattena\u030anga (kondens) bildas.[\/vc_column_text][vc_column_text]FUKT I MATERIAL<\/strong>
\nFuktkvoten (% FK) a\u0308r skillnaden i procent mellan vattnets vikt i fuktigt material och det torkade materia- lets vikt. Fuktkvoten kan besta\u0308mmas genom va\u0308gning- torkning-va\u0308gning. I tra\u0308 kan fuktkvoten dessutom ma\u0308tas med elektroniska fuktkvotsma\u0308tare eftersom de elektriska egenskaperna varierar med fuktkvoten. I betong kan fuktkvoten ma\u0308tas genom att man borrar ett ha\u030al, dammsuger rent, ta\u0308tar det och la\u030ater det sta\u030a na\u030agra dygn tills ja\u0308mvikt ra\u030ader (se fuktbalans). da\u0308refter[\/vc_column_text][\/vc_column][vc_column width=”1\/2″][vc_column_text]kan man ma\u0308ta relativa luftfuktigheten i borrha\u030alet vilket i sin tur kan ge fuktkvoten i betongen, da\u030a man ka\u0308nner till sorbtionskurvan fo\u0308r just den betongsorten. det a\u0308r viktigt att man dammsuger noggrant, ta\u0308tar ordentligt runt fuktgivaren och la\u030ater den sta\u030a i borrha\u030alet tills ja\u0308mvikt ra\u030ader. Borrha\u030alet bo\u0308r vila i ca 48 timmar innan ma\u0308tning go\u0308rs fo\u0308r att ra\u0308tt ja\u0308mviktsfuktkvot ska uppna\u030as. Va\u0308nta minst en halvtimme efter att proben fo\u0308rts in i ha\u030alet innan avla\u0308sning av ma\u0308tva\u0308rdet sker.[\/vc_column_text][vc_column_text]VAL AV FUKTM\u00c4TARE
\n<\/strong><\/p>\n

\n
\n
\n
\n

Fo\u0308ljande fra\u030agor a\u0308r bra att sta\u0308lla sig innan man va\u0308ljer fuktma\u0308tare:<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

    \n
  • Vilket material skall jag ma\u0308ta pa\u030a?<\/li>\n
  • Hur la\u030angt in i materialet beho\u0308ver jag ma\u0308ta?<\/li>\n
  • Vilken konstruktion skall jag ma\u0308ta pa\u030a?<\/li>\n
  • Med vilken noggrannhet och pa\u030a vilken fuktniva\u030a kommer jag att beho\u0308va ma\u0308ta?<\/li>\n
  • Ta reda pa\u030a fa\u0308rgtillverkarens rekommendationer pa\u030a maximal fuktkvot\/fukthalt fo\u0308re ytbehandling.<\/li>\n<\/ul>\n

    [\/vc_column_text][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1545225846786{margin-top: -130px !important;}”][vc_column]\n

    \"Moisture_meter_picture\"<\/figure><\/div>[vc_column_text]STIFTM\u00c4TARE
    \n<\/b>En s.k. stiftma\u0308tare ma\u0308ter indirekt fukten genom att ma\u0308ta resistansen (konduktansen) med en elektrisk stro\u0308m som ga\u030ar fra\u030an det ena stiftet till det andra. En stiftma\u0308tare ma\u0308ter fukten sa\u030a la\u030angt in som stiften fo\u0308rs in. Va\u0308lj la\u0308ngre ma\u0308tstift fo\u0308r att kontrollera fukt la\u0308ngre in i tra\u0308et. Fo\u0308r att ma\u0308ta s.k. fuktgradienter kra\u0308vs teflonisolerade ma\u0308tstift.strin.[\/vc_column_text]\n
    \n
    \n
    \n \"Pin\n <\/div>\n
    \n
    \n \n F\u00d6RDELAR MED STIFTM\u00c4TARE:<\/strong><\/p>\n
      \n
    • Bepr\u00f6vad metod som l\u00e4nge anv\u00e4nts i tr\u00e4- och byggindustrin.<\/li>\n
    • Snabb. M\u00e4tresultat visas direkt p\u00e5 display<\/li>\n
    • M\u00f6jlighet att detektera fuktgradienter.<\/li>\n
    • Bra vid oj\u00e4mna materialytor.<\/li>\n<\/ul>\n

      NACKDELAR MED STIFTM\u00c4TARE:<\/strong><\/p>\n

        \n
      • Fo\u0308rsto\u0308rande ma\u0308tmetod. Stiften ma\u030aste tra\u0308nga in i materialet fo\u0308r att kunna ma\u0308ta.<\/li>\n
      • Vid ho\u0308ga fuktkvotshalter i tra\u0308 kan vattnet tillsammans med ka\u030adan joniseras. detta medfo\u0308r att fuktkvoten tycks variera.<\/li>\n
      • A\u0308r temperaturberoende kra\u0308ver temperaturkompensation fo\u0308r ba\u0308sta noggrannhet.<\/li>\n
      • M\u00e4tresultat kan p\u00e5verkas av impregneringsmedel.<\/li>\n<\/ul>\n

        ATT T\u00c4NKA P\u00c5:<\/strong><\/p>\n

          \n
        • En slaghammare g\u00f6r livet enklare via m\u00e4tningar med teflonisolderade m\u00e4tstift.<\/li>\n
        • F\u00f6r in stiften vinkelr\u00e4tt mot tr\u00e4ets \u00e5dring.<\/li>\n
        • M\u00e4t inte i \u00e4ndtr\u00e4et, cellstrukturen i virket g\u00f6r att fuktkvoten i \u00e4ndarna kan variera kraftigt j\u00e4mf\u00f6rt med fuktkvoten l\u00e4ngre in i tr\u00e4\u00e4mnet.<\/li>\n
        • Vid upprepade m\u00e4tningar, vid exempelvis efterkontroller av fuktskador, sl\u00e5 in stiften i nya h\u00e5l, gamla stifth\u00e5l oxiderar och visar l\u00e4gre m\u00e4tv\u00e4rde.
          \n<\/strong><\/li>\n<\/ul>\n

          \n <\/div>\n <\/div>\n <\/div>\n <\/div>[vc_row_inner][vc_column_inner][vc_column_text]KAPACITIV\/OF\u00d6RST\u00d6RANDE FUKTM\u00c4TARE<\/strong>
          \nEn kapacitiv\/of\u00f6rst\u00f6rande fuktm\u00e4tare m\u00e4ter f\u00f6r\u00e4ndringar i materialets kapacitans som varierar beroende p\u00e5 fuktinneh\u00e5llet. Instrumentet s\u00e4nder ut en h\u00f6gfrekvent signal. Den elektriska signalens frekvens kommer att variera p\u00e5 grund av materialets kapacitans.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text css=”.vc_custom_1555503800848{padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;background-color: #ffce00 !important;border-radius: 2px !important;}”]ADVANTAGES OF CAPACITIVE MOISTURE METERS:<\/strong><\/p>\n

            \n
          • Ofo\u0308rsto\u0308rande ma\u0308tmetod, ingen a\u030averkan pa\u030a ma\u0308tobjektet.<\/li>\n
          • Snabb. Ma\u0308tresultat direkt, ma\u0308t pa\u030a sa\u030a ma\u030anga sta\u0308llen som beho\u0308vs.<\/li>\n
          • Oberoende av temperatur, kra\u0308ver ingen temperaturkompensation.<\/li>\n<\/ul>\n

            [\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_column_text css=”.vc_custom_1555503866154{padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;background-color: #ffce00 !important;border-radius: 2px !important;}”]NACKDELAR MED KAPACITIV FUKTM\u00c4TARE:<\/strong><\/p>\n

              \n
            • Densitetsberoende, fo\u0308r ba\u0308sta noggrannhet kra\u0308vs materialinsta\u0308llning.<\/li>\n
            • Detekterar armeringsja\u0308rn och andra metaller som fo\u0308rho\u0308jd fuktkvot om dessa a\u0308r inom ma\u0308tdjup och avka\u0308nningsomra\u030ade.<\/li>\n
            • Kra\u0308ver god anla\u0308ggning av sensorerna mot materialet.<\/li>\n<\/ul>\n

              [\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"[vc_row][vc_column width=”1\/2″][vc_column_text]RELATIV LUFTFUKTUGHET (RF) Luftens fo\u0308rma\u030aga att ta upp vatten varierar med temperaturen. 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