Dab tsi yog qhov ua tsis tau zoo ntawm kev sojntsuam yooj yim -hom thermocouples

I. Tsawg Thermoelectric Potential (Low Instrument Reading)

Qhov no yog qhov teeb meem feem ntau, thiab nws tshwm sim raws li qhov ntsuas kub uas qis dua tus nqi tiag tiag.


Cov khoom siv thermal electrode tuaj yeem tawg lossis "ntsuab corrosion."

When K-type thermocouples are used for a long time in high-temperature situations (>800 degree), npib tsib xee-chromium zoo electrode tuaj yeem xaiv oxidize, tsim kom muaj xim ntsuab txheej uas txo qis cov khoom siv hluav taws xob.

Txhawm rau kom nws ruaj khov dua, txiav tawm qhov tsis zoo thiab rov- vuam, lossis hloov nrog N- hom thermocouple.

Kev kis kab mob los yog fouling ntawm lub raj rwb thaiv tsev

Plua plav, roj, los yog slag nyob rau hauv lub cub tawg mus rau sab hauv phab ntsa ntawm lub ceramic insulation raj. Qhov no ua rau cov dej xau ntawm cov electrodes lossis conduction rau hauv av, uas ua rau cov teeb liab tso tawm tsis zoo.

Solution: Take out the thermocouple core on a regular basis, clean it with anhydrous alcohol, dry it, and see if the insulation resistance has gone back up (it should be >100MΩ).

Kev puas tsuaj los yog tawg ntawm cov ntaub thaiv npog

Thaum lub sheath kub dhau lawm, nws tuaj yeem tawg lossis tawg los ntawm cov khoom siv tsoo nws. Qhov no tuaj yeem tso tawm hauv, ua kom cov electrode corrosion, lossis ua rau luv luv.

Txhawm rau ua kom muaj kev cuam tshuam ntau dua- tiv taus, hloov nws nrog cov qauv uas muaj cov raj tiv thaiv tuab dua lossis siv cov hlau-cov ntaub nplaum ceramic.

Kev them nyiaj cov xov hlau tsis zoo ib yam lossis muaj lawv cov polarity hloov

Kev siv cov xov hlau uas tsis sib xws (xws li E- hom es tsis yog K- hom) lossis hloov cov ncej zoo thiab qhov tsis zoo thaum lub sijhawm teeb tsa yuav ua rau qhov kev sib tshuam txias tsis raug, uas yuav ua rau cov ntawv nyeem tsis tu ncua.

Txheeb xyuas hom calibration kom paub tseeb tias cov nyiaj them nyiaj sib npaug ntawm cov thermocouple, thiab xyuas kom meej tias qhov polarity yog qhov tseeb.



II. Siab thermoelectric peev xwm (siab ntsuas ntsuas)

Qhov kev ua yuam kev no tsis tshwm sim ntau zaus, tab sis nws hloov pauv li cas tib neeg txiav txim siab.

Thermocouple thiab Display Instrument Calibration Type tsis yog tib yam.

Yog tias lub thermocouple yog K- hom thiab qhov ntsuas tau teeb tsa rau S- hom, lub kaw lus yuav xav tias qhov kub thiab txias siab dua txij li S- hom tso tawm qhov muaj peev xwm me dua ntawm tib qhov kub.

Kev daws: Txheeb xyuas thiab teeb tsa hom calibration rau ob qho tib si thermocouple thiab ntsuas. Superposition ntawm DC Interference Signals

Hauv av voj voog tam sim no tuaj yeem muab ntxiv rau lub peev xwm thermoelectric thaum nyob ze - cov khoom siv DC fais fab lossis vim muaj av tsis zoo. Qhov no tuaj yeem ua rau kev nyeem ntawv zoo li siab dua li lawv.

Kev daws: Siv ib qho -point grounding method, uas txhais tau hais tias grounding lub shielding txheej ntawm ib kawg kom lub voj tsis tsim.



III. Tsis ruaj tsis khov Signal Output (Tus nqi ntawm cov zaub hloov ntau heev)

Kev ruaj ntseg ntawm kev tswj tsis siv neeg yog cuam tshuam los ntawm kev hloov pauv loj hauv kev nyeem ntawv.Intermittent lossis Bad Contact ntawm Thermoelectric Electrode

Lub thermocouple xaim tuaj yeem txuas thiab cuam tshuam ib ntus vim kev qaug zog, microcracks, lossis vuam tsis zoo thaum nws vibrates, uas tuaj yeem ua rau lub teeb liab cuam tshuam.

Siv ib lub multimeter los xyuas qhov Circuit Court tsis kam raws li kev daws teeb meem. Yog tias qhov hloov pauv hloov, koj yuav tsum hloov lub thermocouple tam sim ntawd.

Terminal Blocks uas yog xoob lossis Oxidized

Cov terminals nyob rau hauv lub hlws ris lub thawv tsis nruj, los yog qhov chaw tiv tauj tau oxidized tom qab nyob rau hauv ib tug siab - qhov kub thiab txias ib puag ncig rau lub sij hawm ntev, uas hloov cov kev sib cuag tiv thaiv thiab ua rau lub teeb liab hloov.

Kev daws: Ntxuav lub davhlau ya nyob twg saum npoo, nruj dua, thiab siv cov tshuaj nplaum uas tiv thaiv oxidation.

Kev cuam tshuam los ntawm electromagnetic teb (EMI)

Qhov chaw sib nqus sib nqus tuaj yeem ua rau cuam tshuam qhov hluav taws xob hauv kab teeb liab thaum nws nyob ze rau qhov muaj zog electromagnetic xws li zaus converters thiab motors.

Txhawm rau txhim kho qhov teeb meem, siv cov ntaub thaiv npog tiv thaiv kev tiv thaiv, nyob deb ntawm lub hwj chim cables, thiab tsis txhob muab tso rau hauv tib lub kav dej.



IV. Tsis muaj Thermoelectric Potential Output (Instrument No Display or Error)

Qhov no feem ntau qhia tau hais tias lub teeb liab Circuit Court tawg tag.

Thermocouple Hlau Uas tawg

Lub thermocouple hlau tawg thaum nws khoov ntau dhau thaum lub sijhawm teeb tsa, kub dhau thiab ua nkig, lossis tau txais kev puas tsuaj los ntawm mechanically.

Yog tias qhov tawg nyob rau hauv qhov chaw uas nws tuaj yeem txiav thiab rov ua dua -welded, ua li ntawd. Yog tias tsis yog, tau txais ib lub thermocouple tshiab.

Ib qho luv luv Circuit Court lossis qhib Circuit Court hauv kab ntsuas

Ib qho luv luv tshwm sim thaum dej nkag mus rau hauv lub thawv sib txuas los yog cov plua plav tsim nyob rau ntawd. Ib qho qhib Circuit Court tshwm sim thaum cov nyiaj them poob haujlwm raug thawb sib nrug.

Kev daws: Ntsuas lub voj voog hauv qhov chaw kom pom tias nws tseem txuas nrog, nrhiav thaj chaw teeb meem, thiab kho nws.



V. Cov lus qhia txog Kev Tiv Thaiv Kev Tiv Thaiv

Txhawm rau ua kom yooj yim sojntsuam-hom thermocouples txhim khu kev qha, ob peb kauj ruam tau qhia:

Tsis tu ncua xyuas thiab ntxuav: Txhua peb lub hlis, ntxuav qhov ntsuas kub ntsuas qhov kawg thiab lub thawv sib txuas kom tsis txhob muaj plua plav thiab noo noo los ntawm kev tsim. Cov txheej txheem kev teeb tsa tus qauv: Tsis txhob khoov cov xov hlau ntau dhau, thiab xyuas kom tseeb tias qhov tob tob yog tsawg kawg yog 8 mus rau 10 npaug ntawm txoj kab uas hla ntawm lub raj tiv thaiv.

Kev tiv thaiv zoo dua rau ib puag ncig: Txhawm rau kom cov dej noo tawm, lub thawv xaim hluav taws xob yuav tsum fim. Hauv qhov chaw uas muaj kev vibration ntau, koj yuav tsum ntxiv kev co - ntsuas ntsuas.

Teeb tsa lub ntsuas ntsuas: Kom paub tseeb tias qhov ntsuas tau raug, ntsuas cov cuab yeej ntawm -site txhua 6 txog 12 lub hlis, nyob ntawm seb nws siv li cas.