Polytetrafluoroethylene (PTFE, code F4) sheathed corrosion-resistant thermocouples thiab resistance temperature detectors (RTDs) yog tsim los rau kev ntsuas kub hauv cov tshuaj corrosive thiab cua sov- cov txheej txheem kev kho mob, qhov twg cov pa stainless hlau sensors tsis nyob rau hauv hnub rau lub lis piam.
Hauv cov tshuaj tiv thaiv kab mob thiab cov khoom siv hluav taws xob- cov kab kev kho mob, xws li electroplating, pickling, thiab oxidation, cov txheej txheem cov kua dej yuav luag ib txwm muaj cov acids uas muaj zog lossis muaj zog hauv paus. Kev tswj qhov kub thiab txias hauv cov txheej txheem no yog qhov tseem ceeb, tab sis tus qauv sensors nrog stainless hlau sab nrauv sheaths tsis tuaj yeem ua tau raws li cov kev xav tau ntawm corrosion thiab feem ntau ua tsis tiav nyob rau hauv ib hlis lossis ob peb hnub. Cov khoom lag luam tshiab no daws qhov kev ua tsis tiav no los ntawm kev cais cov hlau sheath thiab qhov ntsuas qhov ntsuas los ntawm qhov nruab nrab ntsuas.
Cov sensors siv cov tshuaj lom neeg zoo heev ntawm PTFE. F4 yog lub npe hu ua "King of Plastics" thiab tuaj yeem tiv taus cov kua qaub muaj zog, suav nrog aqua regia, sulfuric acid, hydrofluoric acid, concentrated phosphoric acid, thiab nitric acid; muaj zog hauv paus, xws li boiling sodium hydroxide tov; thiab muaj zog oxidizing cov neeg ua haujlwm, txo cov neeg ua haujlwm, thiab cov kuab tshuaj organic. Nws kuj muaj kev laus tiv thaiv, hluav taws xob tiv thaiv, nplaim hluav taws kub, tsis yog - cov khoom nplaum, thiab cov coefficient tsis tshua muaj kev sib txhuam, ua rau nws yog ib qho ntawm cov khoom siv corrosion feem ntau muaj.
Kev tsim kho siv ntau txheej txheej txheej tsim: F4 txhuas hlau, sealant, F4 lub tes tsho sab nrauv, stainless hlau raj, magnesium oxide hmoov rwb thaiv tsev, thiab cov khoom hnov. PTFE yog sintered rau saum npoo ntawm lub thermocouple los yog RTD sheath los ntawm ib tug tshwj xeeb molding thiab sealing txheej txheem. Rau ntev los yog nqaim sheaths-nrog rau cov diameters ntawm tsawg tshaj li 10 mm- ib tug txhim khu kev qha raj- tes tsho thiab kawg- sealing txoj kev yog siv los cais tag nrho cov hlau sheath los ntawm cov txheej txheem nruab nrab. F4 version muaj qhov ntsuas kub tsis tu ncua ntawm -180℃txog 250 degree, thiab F46 (fluorinated ethylene propylene, FEP) version muaj rau siv txog 200 degree. Lub neej ua haujlwm hauv chaw ua haujlwm tshaj li ib xyoos.
Cov sensors no tsim nyog rau cov tshuaj fluorochemical, sulfur chemical, chlor-alkali, tshuaj, thiab txhua yam cua sov- daim ntawv thov kev kho mob. Lawv raug ntsia rau ntawm cov kua tso tsheb hlau luam corrosive, cov hlab ntsha, thiab cov kav dej los saib xyuas cov txheej txheem kub ncaj qha ntawm qhov chaw uas cov hlau sensors yav dhau los tsis tuaj yeem muaj sia nyob.
Rau kev yuav khoom thiab kev tsim khoom engineering pab pawg ntsuas kev tiv thaiv corrosion- tiv taus qhov kub thiab txias, cov koob no muaj cov kev teeb tsa tsim nyog rau txhua qhov ntsuas nruab nrab thiab kev teeb tsa. Cov ncauj lus kom ntxaws thiab daim ntawv thov - muaj kev sib tham tshwj xeeb yog muaj thaum thov.