Dab tsi yog qhov sib txawv ntawm thermal ua thiab thermocouple teeb liab tso zis tso zis?

1. Qhov xwm ntawm teeb liab. Lub thermal resistor nws tus kheej yog lub resistor. Qhov hloov pauv hauv qhov kub ua rau cov thermal resistor los tsim cov khoom lag luam zoo lossis tsis zoo; Thaum lub thermocouple tsim kev hloov pauv hauv voltage, uas hloov pauv nrog kev hloov pauv kub.

2. Qhov kub ntau yog pom los ntawm ob lub sensors sib txawv. Lub thermal resistor feem ntau kuaj tau qhov kub thiab txias ntau ntxiv tuaj yeem ncav cuag li 600 degrees (ntawm chav kawm, tsis txaus siab kub yuav raug kuaj). Thermocoples tuaj yeem tshawb xyuas qhov kub thiab txias ntawm 0-1000 degrees (lossis siab dua). Yog li ntawd, cov qub yog qhov ntsuas kub qis, thiab tom kawg yog qhov ntsuas kub siab.

3. Los ntawm cov khoom taw tes pom, lub thermal resistor yog cov khoom siv hlau nrog kev hloov pauv kub, thiab cov khoom siv bimetallic, uas yog, ob cov hlau sib txawv. Vim tias cov kev hloov pauv kub, muaj hluav taws xob muaj peev xwm ua kom muaj zog yog tsim ntawm ob qho kawg ntawm ob lub xov hlau sib txawv.

4. Lub tswv yim modules ntawm thermal resistor thiab thermocouple sib haum rau PLC kuj txawv. Cov kab lus no zoo, tab sis feem ntau PLCS tau txuas nrog 4 ~ 20ma cov cim, thaum thermal resistors thiab thermal resistors thiab thermal resistors thiab thermal instectors thiab thermal resistors thiab thermal resectors thiab thermal resistors thiab thermal resectors thiab thermal intors thiab thermal resectors thiab thermal intors thiab thermal resectors thiab thermal intors thiab thermal resors thiab thermal resectors thiab thermal resistors thiab thermal resistors thiab thermal resistors yog feem ntau txuas nrog transcs nrog transmitters. Yog tias koj txuas rau DCS, koj tsis tas yuav siv lub tshuab xa khoom! Thermocoples siv RTD cim thiab thermoces siv TC cim!

Thaum txhim kho thermocouples thiab thermal resistors, koj yuav tsum them sai sai ntsuas ntsuas, kev saib xyuas kev nyab xeeb, thiab tsis cuam tshuam rau cov khoom lag luam thiab kev ua haujlwm ntau. Txhawm rau kom tau raws li cov cai saum toj no, them sai sai rau cov ntsiab lus hauv qab no thaum xaiv qhov chaw teeb tsa thiab cov thermal resistors:

1. Txhawm rau kom ntseeg tau cov cua kub txaus ntawm qhov ntsuas qhov ntsuas, thiab sim kom tsis txhob txhim kho thermocouple, thiab sim ua kom cov raj xa khoom, thiab cov khoom tuag ntawm cov kav dej thiab khoom siv.

2. Thermocouples thiab thermal resistors nrog cov tes tsho tiv thaiv muaj thaum tshav kub hloov thiab ua kom sov dissipation poob. Txhawm rau kom txo qhov ntsuas tsis raug, thermocouples thiab thermal resistors yuav tsum muaj qhov tob txaus:

(1) rau thermocouples uas ntsuas ntsuas kub ntawm cov kua dej ua kua roj,

Kev ntsuas qhov kawg yuav tsum tau tso rau hauv cov raj xa dej (ntsug lossis qaij). Yog tias cov raj xa hluav taws ntawm cov roj ntsuas yog 200 mm, lub ntxig ntxig ntawm cov thermocouple lossis thermal resistor yuav tsum yog 100 mm;

(2) Rau qhov ntsuas kub ntawm qhov kub thiab txias thiab tiv thaiv cov dej kub (xws li cov raj tiv thaiv dej kub uas tuaj yeem tso tawm lossis cov cua sov uas sov tuaj yeem siv tau. Lub taub dej ntiav thermocouple tiv thaiv yuav tsum tau ntxig rau hauv cov kav dej tseem ceeb rau qhov tob tsis tsawg tshaj 75 hli; Tus qauv ntxig tob ntawm cov cua sov-shrouded thermocouple yog 100 hli;

Dab tsi yog qhov sib txawv ntawm cov thermal resistor thiab cov paib thermocouple tawm?

(3) Yog tias qhov ntsuas kub ntawm cov nplaim hluav taws uas yuav tsum tau ntsuas, txawm hais tias tus nplaim hluav taws xob ntawm qhov thermocouple lossis thermal resistor yog 1 m;

(4) Thaum lub qhov tob tob ntawm qhov ntsuas ntsuas tshaj 1m, nws yuav tsum tau muab cov kab xev ntau li ntau tau, lossis cov duab tiv thaiv thiab cov tes tiv thaiv yuav tsum tau nruab.

Siv tau

Qhov tseeb siv cov thermocouples tsis tuaj yeem tau txais qhov ntsuas kub thiab ntseeg tau cov khoom siv ntawm thermocouples, uas tuaj yeem txuag tau nyiaj thiab ua kom cov khoom lag luam zoo. Kev sib txig tsis txaus siab, thermal muab thiab lub sijhawm ua haujlwm tsis raug yog qhov yuam kev tseem ceeb hauv kev siv thermocouples.

1. Yuam kev qhia los ntawm kev teeb tsa tsis raug

Piv txwv li, txoj kev teeb tsa thiab kev nkag ntawm qhov tob ntawm cov thermocouple tsis tuaj yeem cuam tshuam qhov kub ntawm lub cub tawg. Hauv lwm lo lus, lub thermocouple yuav tsis muab nruab ze rau lub qhov rooj lossis cov cua sov, thiab lub qhov tob tob yuav tsum muaj tsawg kawg yog 8 txog 10 zaug lub cheeb ntawm kev tiv thaiv raj; Qhov sib txawv ntawm cov raj thermocouple tiv thaiv thiab lub phab ntsa tsis tau muaj nrog cov ntaub ntawv insulating, uas ua rau kub dua lossis cua txias intrusion nyob rau hauv lub cub tawg. Yog li ntawd, qhov sib txawv ntawm cov raj thermocouple tiv thaiv thiab cov cua sov cov khoom siv los tiv thaiv cov cua kub thiab ua kom muaj kev cuam tshuam ntawm qhov ntsuas kub; Qhov txias kawg ntawm thermocouple yog ib yam nkaus rau lub cev cua sov kom qhov kub tshaj 100 degree; lub installation ntawm thermocouple yuav tsum zam cov teb sib nqus muaj zog thiab muaj zog hluav taws xob ntau li ntau tau, yog li lub fais fab cable ntau li ntau tau, yog li lub hwj chim cable kom zam dhau kev cuam tshuam kom tsis txhob cuam tshuam rau kev cuam tshuam thiab yuam kev; Qhov thermocouple tsis tuaj yeem ntsia hauv thaj chaw uas qhov nruab nrab ntsuas tsis tshua pom. Thaum siv thermocouple los ntsuas cov roj kub hauv lub raj, cov thermocouple yuav tsum tau muab tso tawm tsam cov kev taw qhia ntws thiab nkag siab nrog cov roj.

2. Yuam kev qhia los ntawm rwb thaiv tsev

Yog hais tias thermocouple yog insulated, kev tiv thaiv raj thiab lub reefty kos duab los ntawm thermocouple ncej thiab lub rauv phab ntsa, uas yog qhov hnyav dua ntawm qhov kub. Qhov no yuav tsis tsuas yog ua rau poob ntawm thermoelectric peev xwm tab sis kuj ua kom muaj kev cuam tshuam. Qhov yuam kev tshwm sim los ntawm qhov no tuaj yeem ncav ntau pua ntawm cov degrees.

3. Yuam kev qhia los ntawm thermal inertia

Vim yog lub thermal inertia ntawm thermocouple, cov nqi qhia tau cov nqi ntawm cov lags lub lags tom qab qhov kev hloov ntawm qhov ntsuas kub.

Cov nyhuv no tshwj xeeb tshaj yog thaum ua cov kev ntsuas sai sai. Yog li ntawd, thermocots nrog thinner tiv thaiv lub taub dej Diam hlau yuav tsum tau siv kom ntau li ntau tau. Thaum ntsuas qhov ntsuas kub ib puag ncig, kev tiv thaiv raj tuaj yeem raug tshem tawm. Vim tias qhov kev ntsuas kev ntsuas lav, qhov ntsuas qhov ntsuas kom pom tau yooj yim dua los ntawm cov thermocouple hloov pauv me me ntawm qhov cub hluav taws kub hloov pauv. Qhov ntau dua qhov kev ntsuas kev ntsuas lav, qhov me me uas tau qhov dav ntawm thermocouple hloov pauv, thiab qhov ntau dua qhov sib txawv nrog cov cua sov tiag. Thaum siv lub thermocouple nrog lub sijhawm loj tas li los ntsuas lossis tswj qhov kub thiab txias, txawm hais tias qhov ntsuas kub tau hloov me me, qhov tseeb ua kom sov sov yuav hloov kho zoo heev. Txhawm rau kom raug ntsuas ntsuas qhov kub, ib qho thermocouple nrog lub sijhawm me me uas yuav tsum tau xaiv. Lub sijhawm tas mus li yog qhov ua tau siab tshaj plaws rau cov cua sov hloov cov coefficient thiab yog sib npaug rau qhov kub kawg ntawm cov khoom siv thiab cov cua sov tshwj xeeb. Yog tias koj xav txo lub sijhawm tas mus li, ntxiv rau kev nce qib cua sov hloov pauv, txoj hauv kev zoo heev yog txo qis qhov loj me ntawm qhov kawg ntawm qhov kawg ntawm qhov kawg ntawm qhov kawg ntawm qhov kawg ntawm qhov kawg ntawm qhov kawg. Hauv kev siv, cov ntaub ntawv nrog zoo thermal conductivity, nyias phab ntsa thiab me huv sab hauv lub taub tiv thaiv cov tes tiv thaiv tau feem ntau siv. Nyob rau hauv ntau dua cov ntsuas kub ntau, tus pas ntsuas xaim xaim hluav taws xob yam tsis muaj kev tiv thaiv cov tsho hnav, tab sis thermocouples tau yooj yim thiab hloov hauv lub sijhawm.

4. Thermal kuj yuam kev

Thaum muaj kub kub, yog tias muaj txheej ntawm thee ntawm thee ntawm lub raj tiv thaiv thiab hmoov av ua ke nce, cov thermal kuj nce, cuam tshuam nrog kev ua kom sov. Lub sijhawm no, qhov ntsuas kub yog qis dua tus nqi tseeb ntawm kev ntsuas kub ntsuas. Yog li ntawd, sab nraud ntawm Thermocouple tiv thaiv raj yuav tsum tau ceev kom huv kom txo qhov yuam kev.