Lub thermocouple siv tau ntev npaum li cas? Qhov ntsuas qhov tseeb puas yuav txo qis rau lub sijhawm ntev?

Lub sijhawm thiab qhov kub thiab txias yog ob qho tib si ntsuas qhov zoo.

Hauv kev tsim khoom lag luam niaj hnub, qhov tseeb ntawm qhov ntsuas kub yog qhov tseem ceeb. Raws li ib qho ntawm cov ntsuas kub uas siv ntau tshaj plaws, qhov ntev - lub sij hawm ruaj khov ntawm cov thermocouples yog ib qho kev qhia tseem ceeb heev, tshwj xeeb tshaj yog rau cov lag luam uas muaj teeb meem kev saib xyuas siab (xws li cov thee - hluav taws xob hluav taws xob).

Ntev npaum li cas -lub sij hawm stability ntawm lub thermocouple?

Cias muab, ntev -lub sij hawm stability yog hais txog ntev npaum li cas ib tug thermocouple yuav siv tau tom qab muab ntsia rau hauv cov cuab yeej tsis hloov nws qhov tseeb. Raws li cov neeg siv, peb ib txwm cia siab tias lub sijhawm no tuaj yeem ntev li ntev tau.

Vim li cas cov thermocouples muaj kev ntsuas qhov sib txawv?

Tom qab siv sijhawm ntev -, thermocouples tuaj yeem muaj kev ntsuas qhov sib txawv. Qhov no feem ntau yog vim muaj cov hauv qab no:

1. Cov khoom aging thiab paug

Cov xaim thermocouple tuaj yeem raug paug los ntawm ib puag ncig huab cua lossis cov khoom tsis huv hauv cov raj tiv thaiv thaum siv sijhawm ntev -. Cov theem sib txawv ntawm cov kab mob sib txawv yuav tsim cov peev txheej sib txawv, yog li hloov cov yam ntxwv calibration qub. Piv txwv li, thaum siv platinum-rhodium 10-platinum thermocouple nrog lub raj ceramic, yog tias lub raj ceramic muaj cov hlau impurities, platinum-rhodium hlau yuav kis tau los ntawm cov hlau, cuam tshuam rau nws cov yam ntxwv thermoelectric.

2. Kev hloov ntawm qhov kub thiab txias

Thaum qhov kub thiab txias, cov ntaub ntawv thermocouple tuaj yeem hloov pauv xws li kev loj hlob ntawm cov nplej thiab oxidation, ua rau hloov pauv hloov pauv hauv cov khoom siv thermoelectric. Tom qab siv sijhawm ntev, qhov ntsuas kub muaj peev xwm -kev sib raug zoo ntawm qee qhov thermocouples tuaj yeem txav mus, cuam tshuam qhov ntsuas qhov tseeb. Thermocouple xov hlau feem ntau yog ua los ntawm alloys; vim qhov sib txawv ntawm vapor siab ntawm cov khoom, cov alloy muaj pes tsawg leeg hloov pauv lub sijhawm ntawm qhov kub thiab txias, ua rau muaj kev hloov pauv tseem ceeb hauv cov peev txheej thermoelectric.

3. Oxidation thiab Reduction Reactions

Ntau cov thermocouple instabilities yog tshwm sim los ntawm oxidation ntawm cov thermocouple xov hlau. Copper-constantan, iron-constantan, thiab nickel-chromium-nickel-silicon thermocouples yog tag nrho cov raug oxidation. Yog hais tias lub thermocouple yog uniformly oxidized, qhov cuam tshuam yuav me me; Txawm li cas los xij, yog tias qhov kev nyiam oxidation tshwm sim (piv txwv li, chromium hauv nickel-chromium electrode undergoes nyiam oxidation nyob rau hauv qis oxygen ib nrab siab), nws yuav hloov cov hlau muaj pes tsawg leeg, ua rau muaj kev cuam tshuam loj heev.

4. Mechanical Stress thiab Embrittlement

Thaum siv, cov thermocouples yuav muaj kev ntxhov siab sab hauv vim muaj zog sab nraud. Cov kev ntxhov siab no tuaj yeem ua rau lub cev tsis sib xws. Tsis tas li ntawd, embrittlement yog ib qho tseem ceeb uas ua rau thermocouple tsis ua haujlwm, feem ntau yog tshwm sim los ntawm kev sib kis, kev loj hlob ntawm cov nplej, oxidation, thiab recrystallization ntawm qhov ntev - lub sij hawm kub siab.

Dab tsi cuam tshuam rau lub neej ntawm lub thermocouple?

Lub neej ntev ntawm lub thermocouple yog txwv los ntawm ntau yam:

Cov khoom zoo thiab cov yam ntxwv: High-cov ntaub ntawv thermocouple electrode zoo thiab cov ntaub ntawv tiv thaiv tuaj yeem ua rau lub neej ntev. Piv txwv li, platinum-rhodium thermocouples, vim lub siab ruaj khov thiab oxidation tsis kam ntawm platinum-rhodium alloy, tuaj yeem siv tau ntev heev nyob rau hauv cov xwm txheej tsim nyog.

Qhov hnyav ntawm kev khiav hauj lwm ib puag ncig: Nyob rau hauv ib puag ncig huab cua xws li kub, kub siab, muaj zog corrosion, thiab siab txaus tus nqi, hnav tus nqi ntawm thermocouples yuav nrawm.

Kev txhim kho thiab kev saib xyuas: Kev teeb tsa tsis raug tuaj yeem ua rau cov neeg kho tshuab kev ntxhov siab lossis kev ua haujlwm tsis zoo, thaum tsis muaj kev saib xyuas tsis tu ncua yuav ua rau cov thermocouple kev ua tau zoo maj mam poob.

Yuav ua li cas txhawm rau txhim kho lub sijhawm ntev - ruaj khov ntawm lub thermocouple?

Kev xaiv cov khoom yog qhov tseem ceeb

Ib qho tseem ceeb tshaj plaws uas txiav txim siab txog qhov ntev - lub sij hawm ruaj khov ntawm lub ntsuas kub ntsuas qhov ntsuas kub yog qhov xaiv cov khoom. Piv txwv li, cov hlau uas tsim nyob rau hauv lub teb chaws Yelemees suav nrog lwm yam tsis tshua muaj nyob rau hauv nws cov tshuaj muaj pes tsawg leeg, muab nws zoo heev raug thiab ntev - lub sij hawm stability.

Qhov tseem ceeb ntawm cov txheej txheem tsim khoom

Kev tsim thiab kev siv cov txheej txheem tsim khoom kuj tseem cuam tshuam rau lub sijhawm ntev -kev ruaj khov ntawm thermocouples. Qhov no suav nrog:

Yuav ua li cas weld cov thermocouple xov hlau zoo thiab xyuas kom muaj kev tiv thaiv kev tiv thaiv zoo

Tuav qhov kub thiab av noo ib puag ncig hauv cov txheej txheem tsim khoom

Txhua yam khoom yuav tsum tau xeem tsawg kawg yog peb qhov kev xeem

Kev txhim kho kom raug thiab kev tu tsis tu ncua

Kev txhim kho kom zoo thiab kev saib xyuas tsis tu ncua yog qhov tseem ceeb rau kev tswj xyuas qhov ntsuas qhov tseeb ntawm thermocouples. Qhov no suav nrog:

Kev txhim kho nyob rau hauv ib qho chaw uas qhia meej qhov ntsuas kub ntawm qhov nruab nrab ntsuas

Tsis txhob muaj zog mechanical vibrations

Siv nyob rau hauv qhov ntsuas kub uas tau teev tseg

Ua tsis tu ncua kev tshuaj xyuas thiab tu

Hloov cov khoom puas sensing tam sim ntawd