Kev xaiv lub sij hawm tas li ntawm qhov ntsuas kub tsis kam (RTD): Qhov kev txiav txim siab tseem ceeb rau kev ntsuas qhov kub thiab txias

Raws li ib qho ntawm cov khoom siv feem ntau siv hauv kev ntsuas kub, kev ua haujlwm ntawm cov ntsuas kub tsis kam tiv thaiv (RTDs) ncaj qha cuam tshuam rau qhov raug thiab kev ntseeg siab ntawm tag nrho cov ntsuas kub. Tshwj xeeb tshaj yog thaum ntsuas qhov kub thiab txias (piv txwv li, qhov xwm txheej qhov kub hloov pauv lub sijhawm), kev xaiv lub sijhawm tas mus li dhau los ua qhov kev txiav txim siab tseem ceeb. Kab lus no yuav tshawb txog qhov tob yuav ua li cas xaiv lub sijhawm tsim nyog rau RTDs hauv kev ntsuas qhov kub thiab txias.

Lub sij hawm tas li ntawm RTD yog dab tsi?

Lub sij hawm tas mus li (τ) yog qhov tseem ceeb ntawm kev piav qhia cov lus teb ceev ntawm RTD. Nws sawv cev rau lub sijhawm xav tau rau RTD qhov kub kom ncav cuag 63.2% ntawm qhov sib txawv ntawm qhov kub thiab txias thaum kawg tshwm sim. Cias muab tso, lub sij hawm tas mus li quantifies lub℃ntawm lag nyob rau hauv lub RTD cov lus teb rau kub hloov.

Piv txwv li, yog tias qhov kub thiab txias ambient dheev nce los ntawm 50℃mus rau 100 degree, lub sij hawm tas li yog lub sij hawm xav tau rau RTD kom pom qhov kub ntawm 50 + (100 - 50) × 63.2%=81.6℃. Qhov me me ntawm lub sij hawm tas mus li, qhov sensor teb sai dua, thiab qhov ntsuas tau zoo dua qhov ntsuas qhov ntsuas qhov tseeb qhov hloov pauv.

Qhov cuam tshuam ntawm lub sij hawm tas li ntawm Dynamic Temperature Measurement

Hauv kev ntsuas kub dynamic, lub sijhawm tsis tsim nyog tuaj yeem ua rau muaj teeb meem loj:

Kev ntsuas hysteresis: Tus nqi qhia ntawm qhov ntsuas kub tsis kam (RTD) ib txwm lags tom qab qhov hloov pauv ntawm qhov ntsuas kub. Cov nyhuv hysteresis no tshwj xeeb tshaj yog nyob rau hauv ib puag ncig nrog kev hloov kub ceev.

Amplitude attenuation: Qhov amplitude ntawm qhov kub thiab txias ntsuas los ntawm RTD feem ntau yog me dua qhov tseeb qhov kub hloov pauv amplitude. Qhov loj dua lub sij hawm tas mus li, qhov hnyav dua qhov amplitude attenuation.

Control distortion: Hauv kev tswj qhov kub thiab txias, lub sij hawm loj heev tas li tuaj yeem ua rau lub cev oscillation lossis tswj tsis ruaj khov vim tias cov ntaub ntawv kub tau txais los ntawm tus maub los tsis tuaj yeem cuam tshuam cov kev ua haujlwm tiag tiag hauv lub sijhawm.

Cov kev tshawb fawb tau pom tias thaum lub sij hawm tas li ntawm RTD loj heev, qhov ntsuas kub ntawm qhov ntsuas yuav hloov pauv me ntsis, tab sis qhov tseeb qhov ntsuas kub hloov pauv yuav loj. Qhov kev cuam tshuam no tuaj yeem cuam tshuam rau cov txheej txheem zoo thiab kev nyab xeeb ntawm cov khoom siv.

Tej yam tseem ceeb cuam tshuam rau lub sij hawm tas li

Tus tsim thiab cov khoom siv ntawm RTD nws tus kheej txiav txim siab nws lub sijhawm tas li:

Thaum tshav kub kub muaj peev xwm: Qhov kub tsawg RTD yuav tsum tau nqus kom sov, qhov me me nws lub peev xwm kub, thiab qhov me dua nws lub sij hawm tas li.

Kev tiv thaiv tube qauv: Qhov loj ntawm txoj kab uas hla thiab lub thickness ntawm phab ntsa ntawm lub raj tiv thaiv, qhov loj dua lub sij hawm tas li. Siv nyias- phab ntsa, me me - txoj kab uas hla tiv thaiv tuaj yeem txo lub sij hawm tas li.

Cov khoom siv thermal conductivity: Lub thermal conductivity ntawm lub raj tiv thaiv thiab cov khoom ntim sab hauv ncaj qha cuam tshuam rau kev hloov hluav taws xob. Cov ntaub ntawv zoo thermal conductivity pab txo lub sij hawm tas li.

Hom qauv: Sib dhos RTDs muaj lub sijhawm loj dua, thaum nyias - zaj duab xis RTDs, vim lawv qhov me me thiab qhov muaj peev xwm kub me me, feem ntau muaj lub sijhawm me me.

Yuav ua li cas xaiv lub sijhawm tsim nyog tas li rau daim ntawv thov:

Xaiv lub sij hawm tas mus li raws li qhov hloov pauv ntawm qhov ntsuas qhov ntsuas kub yog lub hauv paus ntsiab lus. Qhov kub hloov pauv sai dua, qhov me me ntawm lub sijhawm yuav tsum tau ua tas li:

Rau maj mam hloov qhov kub thiab txias (piv txwv li, chav ntsuas kub ntsuas, ntsuas qhov ntsuas kub ntawm lub thawv loj): Cov ntsuas kub tsis kam (RTDs) nrog lub sijhawm loj dua (tsawg lub vib nas this mus rau feeb) tuaj yeem xaiv. Cov sensors no feem ntau muaj zog thiab ruaj khov.

Rau qhov hloov pauv kub ceev (lub cav tso tawm, cov txheej txheem tshuaj lom neeg, cov cua sov me me): RTDs nrog lub sijhawm me me (hauv ob peb feeb) yuav tsum tau xaiv, xws li nyias - zaj duab xis lossis xaim RTDs.

Nyob rau hauv ib puag ncig huab: Ib puag ncig nrog corrosion, kev co, los yog siab siab yuav tsum muaj qhov sib npaug ntawm cov lus teb ceev thiab qib kev tiv thaiv. Armored RTDs tuaj yeem xav txog.

Cov ntaub ntawv thov siv tau: Cov chaw tsim hluav taws xob chromatograph tau tshawb pom tias thaum cov neeg siv hloov pauv thawj daim nyias nyias -film platinum RTDs nrog hlau-encapsulated platinum RTDs thaum nws tus kheej- kho, kab ke tswj qhov ntsuas kub tau nthuav tawm cov oscillations tseem ceeb. Qhov laj thawj yog vim li cas lub sij hawm loj dua ntawm cov hlau-encapsulated platinum RTDs tsis sib haum nrog cov thermal inertia me me ntawm lub qhov cub, ua rau muaj kev cuam tshuam hauv lub hauv paus ntawm sinusoidal hauv kev tswj.

Cov tswv yim ua kom txo tau lub sij hawm tas li

Tom qab xaiv qhov ntsuas kub tsis kam (RTD), lub sijhawm tas li tuaj yeem ua kom zoo dua hauv cov hauv qab no:

Optimize Installation: Xyuas kom txaus qhov tob tob. Feem ntau, rau cov kua xov xwm, qhov tob ntxig yuav tsum yog tsawg kawg yog 15 npaug ntawm cov yeeb nkab txoj kab uas hla, thiab rau cov xov xwm gaseous, tsawg kawg 25 zaug.

Txhim kho Kev Tiv Thaiv Kev Kub Kub: Sau qhov chaw ntawm lub raj tiv thaiv thiab cov khoom siv thermal nrog cov khoom siv thermally (xws li siab -purity alumina hmoov), los yog siv thermally conductive silicone roj los txhim kho kev tiv thaiv thermal.

Xaiv Txoj Kev Tsim Nyog Lead Wire: Rau kev ntsuas ceev, xav txog kev siv liab qab -wire RTDs yam tsis muaj kev tiv thaiv sheaths, tab sis nco ntsoov tias cov sensors no muaj kev puas tsuaj ntau dua.

Optimize Flow Direction: Nruab RTD ntsib cov kev taw qhia ntawm cov dej ntws los txhim kho cov cua kub hloov pauv thiab txhim kho cov lus teb ceev.

Ntsuas lub sij hawm tsis tu ncua thiab kev ua haujlwm ntawm qhov system

Nws yog ib qho tseem ceeb kom nco ntsoov tias lub sij hawm me me tas li tsis tas yuav zoo dua. Lub sij hawm me me tas li feem ntau txhais tau hais tias lub cev me me thiab cov qauv tsis yooj yim dua, uas yuav cuam tshuam rau lub sensor lub zog thiab ua haujlwm ntev. Qhov sib npaug yuav tsum raug ntaus ntawm cov lus teb ceev thiab lub zog txhua yam thiab ua haujlwm ntev thaum xaiv RTD.

Piv txwv li, nyob rau hauv automotive engine kub xyuas, nws yog ib qhov tsim nyog yuav tau xav txog ob qho tib si lub sensor lub peev xwm los teb rau ceev ceev hloov kub thiab nws muaj peev xwm tiv taus muaj zog vibrations thiab tshuaj corrosion nyob rau hauv lub engine compartment.