Kev ntsuas kub ntawm kev lag luam nrog PT100 3-wire sensors feem ntau txhim khu kev qha, tab sis kev ua yuam kev tseem tuaj yeem tshwm sim, ua rau cov neeg ua haujlwm ntxhov siab thiab cov nqi poob qis. Kev daws teeb meem feem ntau siv sij hawm nkim sij hawm vim cov neeg ua haujlwm tsis paub yuav pib qhov twg - lawv feem ntau hloov lub sensor ua ntej, txawm tias qhov teeb meem yog nrog cov xaim lossis ntsuas. Raws li kev paub dhau los, 80% ntawm PT100 3-wireconnection yuam kev tuaj yeem daws tau nrog kev kuaj xyuas yooj yim, tsis tas yuav hloov cov khoom siv. Kev paub txog kev daws teeb meem zoo li cas tuaj yeem txuag lub sijhawm, txo cov nqi, thiab tau txais lub kaw lus rov qab thiab ua haujlwm sai.
Thawj kauj ruam hauv kev daws teeb meem yog txhawm rau txheeb xyuas hom kev ua yuam kev. Cov kev ua yuam kev feem ntau suav nrog kev nyeem ntawv tsis raug, kev nyeem ntawv tsis tu ncua siab dhau lossis qis dhau, tsis muaj kev nyeem ntawv txhua, lossis kev nyeem ntawv tsis hloov nrog qhov kub thiab txias. Txhua hom kev ua yuam kev taw qhia rau ib qho teeb meem tshwj xeeb, ua kom yooj yim rau kev nqaim qhov ua rau. Piv txwv li, kev nyeem ntawv tsis zoo feem ntau qhia txog kev sib txuas xoob lossis cuam tshuam ntawm electromagnetic, thaum kev nyeem ntawv siab tsis tu ncua tuaj yeem yog vim tsis sib xws ntawm cov xov hlau tsis sib xws lossis qhov chaw tsis raug.
Yog hais tias lub sensor qhia tsis tau nyeem tag nrho, thawj daim tshev yuav tsum yog lub hwj huam mov thiab kev sib txuas. Xyuas kom lub ntsuas yog powered on thiab cov xov hlau txuas mus rau qhov tseeb terminals. Siv ib lub ntsuas ntsuas los ntsuas qhov tsis kam ntawm peb cov xov hlau- ntawm chav tsev kub, qhov kev tiv thaiv ntawm A thiab B (lossis A thiab C) yuav tsum nyob ib puag ncig 110 ohms, thiab nruab nrab ntawm B thiab C yuav tsum yog 0 ohms. Yog tias tsis muaj kev tawm tsam ntawm A thiab B / C, lub sensor yog faulty lossis cov xov hlau tawg. Yog tias qhov kev tawm tsam ntawm B thiab C tsis yog 0 ohms, kev sib txuas sab hauv ntawm lub sensor puas lawm, thiab lub sensor yuav tsum tau hloov.
Kev nyeem ntawv tsis zoo yog ib qho teeb meem tshwm sim, thiab feem ntau tshwm sim los ntawm kev sib txuas xoob lossis cuam tshuam hluav taws xob (EMI). Tshawb xyuas txhua qhov kev sib txuas ntawm cov xaim kom ntseeg tau tias lawv nruj - kev sib txuas xoob tuaj yeem ua rau muaj kev sib cuag tsis sib xws, ua rau kev nyeem ntawv hloov pauv. Yog tias cov kev sib txuas yog nruj, xyuas seb cov xov hlau sensor puas khiav ze ntawm cov xov hluav taws xob lossis lwm qhov chaw ntawm EMI. Cov hluav taws xob xaim hluav taws xob tsim cov chaw sib nqus uas tuaj yeem cuam tshuam nrog lub teeb liab sensor. Txhawm rau txhim kho qhov no, rov kho cov xaim hluav taws xob kom deb ntawm cov xaim hluav taws xob, lossis siv cov xov hlau thaiv kom tsis txhob cuam tshuam. Yog tias cov xov hlau yuav tsum hla, hla lawv ntawm 90-degree lub kaum sab xis kom txo qis EMI.
Kev nyeem ntawv siab lossis qis tsis tu ncua feem ntau qhia tias muaj teeb meem nrog kev sib txuas ntawm cov hlau los yog qhov chaw tso rau sensor. Yog tias qhov kev nyeem ntawv siab dhau lawm, xyuas seb peb cov xov hlau puas zoo ib yam - siv cov xov hlau ntawm cov ntsuas sib txawv lossis cov khoom siv tuaj yeem ua rau lub voj voog txuas tsis sib npaug, ua rau kev nyeem ntawv tsis raug. Yog tias cov xov hlau zoo ib yam, tshawb xyuas qhov ntsuas qhov tob ntawm qhov tob - yog tias qhov kev sojntsuam tsis tau ntxig qhov tob txaus (tsawg dua 200mm), nws yuav ntsuas qhov ntsuas kub ntawm cov huab cua nyob ib puag ncig lossis phab ntsa tank hloov qhov nruab nrab, ua rau kev nyeem ntawv tsis raug. Piv txwv li, nyob rau hauv lub tank dej, ib tug sensor uas tsis txaus insertion qhov tob yuav nyeem 5-10℃siab tshaj qhov tseeb dej kub.
Lwm qhov laj thawj ntawm kev nyeem ntawv tsis raug yog sensor drift, uas tshwm sim thaum lub sensor tsis kam hloov lub sij hawm vim raug kub los yog corrosive ib puag ncig. Txhawm rau txheeb xyuas qhov drift, sib piv cov ntsuas kev nyeem ntawv mus rau qhov ntsuas ntsuas ntsuas ntsuas ntsuas. Yog tias qhov sib txawv sab nraud qhov kev lees paub qhov yuam kev (A级: ±(0.15 + 0.002│t│), B级: ±(0.30 + 0.005│t│)), lub sensor yuav tsum tau calibrated los yog hloov. Calibration feem ntau tuaj yeem kho me me drift, tab sis yog tias qhov drift tseem ceeb, lub sensor yuav tsum tau hloov los xyuas kom meej.
Yog hais tias lub sensor nyob rau hauv qhov kub siab - ib puag ncig, overheating tej zaum yuav yog qhov teeb meem. PT100 sensors muaj qhov kub siab tshaj plaws ntawm kev ua haujlwm ntawm 850 degree, tab sis lub sijhawm ntev raug rau qhov kub thiab txias nyob ze qhov kev txwv no tuaj yeem ua rau muaj kev puas tsuaj mus tas li. Xyuas lub sensor lub sheath rau cov cim qhia ntawm discoloration los yog puas tsuaj- qhov no qhia tias overheating. Yog tias xav tias overheating, txo qhov kev khiav hauj lwm kub los yog hloov lub sensor nrog ib qho ntsuas rau qhov kub siab dua. Tsis tas li ntawd, xyuas kom lub sensor tsis nyob rau hauv kev sib cuag ncaj qha nrog cov cua sov xws li cua sov coils lossis cov kav dej kub, vim qhov no tuaj yeem ua rau muaj cua sov hauv cheeb tsam.
Rau cov laus txav- cov twj paj nruag coil, cov xaim tsis raug cai tuaj yeem ua rau yuam kev. Cov cuab yeej no xav kom txhua lub xaim kom muaj qhov tsis kam ntawm 5 ohms- yog tias cov xov hlau luv dhau, qhov tsis kam yuav tsawg dua 5 ohms, ua rau kev nyeem tsis raug. Siv ib lub ntsuas ntsuas los ntsuas cov hlau tsis kam- yog tias nws tsawg dua 5 ohms, ntxiv manganin resistors los ua qhov sib txawv. Cov cuab yeej tshiab nrog kev ua haujlwm sib txuas ua haujlwm tsis muaj qhov yuav tsum tau ua, yog li daim tshev no tsuas yog tsim nyog rau cov khoom qub.
Thaum kawg, yog tias tag nrho lwm cov kev kuaj xyuas tsis ua tiav, sim lub sensor nrog lwm lub ntsuas. Qee zaum qhov teeb meem tsis yog nrog lub sensor lossis thaiv, tab sis nrog lub ntsuas nws tus kheej. Txuas lub sensor mus rau lub cuab yeej ua haujlwm paub- yog qhov kev nyeem ntawv yog qhov tseeb, cov cuab yeej qub tsis raug thiab yuav tsum tau kho lossis hloov pauv. Yog tias qhov kev nyeem ntawv tseem tsis raug, lub sensor yuav ua yuam kev thiab yuav tsum tau hloov.
Hauv cov ntsiab lus, kev daws teeb meem PT100 3-wire kev twb kev txuas yuam kev yuav tsum muaj ib txoj hauv kev: txheeb xyuas hom kev ua yuam kev, tshawb xyuas cov kev sib txuas thiab lub zog, ntsuas cov hlau tsis kam thiab kev sib txuam, txheeb xyuas qhov ntsuas qhov ntsuas thiab qhov tob tob, xyuas EMI thiab overheating, thiab sim nrog lwm yam ntsuas. Los ntawm kev ua raws li cov kauj ruam no, cov neeg ua haujlwm tuaj yeem daws teeb meem sai sai yam tsis muaj kev hloov pauv. Rau cov teeb meem nyuaj, cov kws kho cua sov tshaj lij tuaj yeem muab rau ntawm - kev daws teeb meem ntawm qhov chaw thiab kev pab txhawb nqa kom txo qis sijhawm.
