Yuav ua li cas los txiav txim seb lub thermocouple xav tau kev ntxuav lossis hloov pauv

I. Tej yam cim qhia tias yuav tsum tau ntxuav

Thaum lub thermocouple nthuav tawm cov xwm txheej hauv qab no, kev ua haujlwm feem ntau tuaj yeem rov qab los ntawm kev ntxuav:

Qhov chaw paug

Roj, carbon deposits, plua plav, los yog slag adhering rau saum npoo ntawm qhov kawg ntawm qhov kawg los yog cov raj tiv thaiv ua ib txheej insulating, ua rau ntsuas kub ntsuas lag lossis qis dua nyeem.

Kev daws: So qhov kev sojntsuam nrog dej cawv lossis tshuaj ntxuav tshwj xeeb. Ultrasonic tu tuaj yeem siv rau qhov loj me.

Plua plav thiab ya raws tsub zuj zuj nyob rau hauv lub hlws ris box los yog connector

Oxidation, plua plav tsub zuj zuj, lossis noo noo hauv cov terminals ua rau muaj kev tiv thaiv kev tiv thaiv thiab teeb liab hloov pauv.

Kev daws: Tshem tawm lub hwj chim, qhib lub thawv sib txuas, ntxuav cov terminals nrog cov cawv cawv, thiab ziab lawv.

Me ntsis qis tab sis rov qab tau cov peev txheej thermoelectric

Thaum kuaj nyob rau hauv qhov ntsuas kub tsis tu ncua, qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas tau qis dua tus nqi theoretical (piv txwv li, rau K- hom thermocouple ntawm 100 degree, nws yuav tsum yog 4.095mV, nrog qhov ntsuas qhov sib txawv tsawg dua lossis sib npaug rau ± 0.1mV), thiab kev ntxuav kom rov zoo li qub.

Kev daws: Ntxuav thiab tom qab ntawd calibrate los xyuas qhov kev ua tau zoo rov qab.

 

II. Ntshiab cov cim qhia tias xav tau kev hloov pauv

Thaum ib qho ntawm cov xwm txheej hauv qab no tshwm sim, lub thermocouple yuav tsum tau hloov ncaj qha thiab yuav tsum tsis txhob siv ntxiv:

tawg thermocouple hlau los yog infinite kuj

Thaum ntsuas nrog lub multimeter ntawm ohm ntau yam, qhov kev tiv thaiv tsis muaj qhov kawg, qhia tias cov thermocouple hlau tawg thiab tsis tuaj yeem ua hluav taws xob.

Judgment standard: The resistance of an assembled thermocouple is generally no more than 2Ω. If it is far beyond this value (e.g., >1kΩ), nws tuaj yeem txiav txim siab puas.

Thermoelectric tej zaum deviates ho los ntawm tus nqi theoretical

Nyob rau hauv ib cheeb tsam uas paub kub (xws li, boiling dej ntawm 100 degree), qhov ntsuas qhov ntsuas kub muaj peev xwm deviates los ntawm lub calibration rooj los ntawm ntau tshaj qhov tso cai yuam kev (piv txwv li, K- hom ± 2.5% lossis ± 2.5mV), thiab kev tu tsis zoo.

Piv txwv li: Tus nqi theoretical rau K-hom thermocouple ntawm 25℃yog kwv yees li 1.000mV. Yog tias qhov ntsuas qhov sib txawv loj dhau, nws qhia tau tias cov khoom tau deteriorated. Kev poob qis hauv rwb thaiv tsev tsis kam

Ntsuas cov rwb thaiv tsev tiv thaiv ntawm cov thermocouple electrodes thiab cov raj tiv thaiv siv 500VDC megohmmeter. Yog tias nws qis dua 10MΩ, nws qhia tau tias muaj kev pheej hmoo ntawm cov dej xau, uas tuaj yeem yooj yim ua rau kev ntsuas drift ntawm qhov kub thiab txias.

Acceptable standard: Normally should be >100MΩ.

Corrosion hnyav, perforation, los yog deformation ntawm lub raj tiv thaiv

Kev soj ntsuam pom pom pom cov kab nrib pleb, corrosion perforations, lossis tseem ceeb khoov ntawm lub raj tiv thaiv, uas yuav ua rau muaj kev nkag mus rau hauv xov xwm lossis oxidation ntawm cov xov hlau thermocouple.

Risk: Nyob rau hauv siab -kub los yog corrosive ib puag ncig, xws li kev puas tsuaj yuav ua kom cov thermocouple tsis ua hauj lwm.

"Green Corrosion" lossis Lattice Distortion ntawm Thermocouple Electrode Khoom

Rau K- hom thermocouples siv rau lub sij hawm ntev tshaj 900 degree, ib txheej ntsuab corrosion tshwm nyob rau ntawm npib tsib xee-chromium zoo electrode, ua rau Seebeck coefficient drift, uas tsis tuaj yeem rov qab los ntawm annealing.

Cov lus qhia txog kev kho mob: Txiav tawm cov seem uas tsis zoo thiab rov ua dua - vuam muaj qhov txwv; Nws raug pom zoo kom hloov tag nrho cov thermocouple nrog N-hom thermocouple.

Tsis teb los yog dhia hloov pauv hauv Dynamic Temperature Rise Test

Yog hais tias lub thermoelectromotive quab yuam tsis hloov thaum lub sij hawm cua sov qeeb, los yog nthuav tawm qhov hloov pauv, nws qhia tau hais tias tsis zoo nyob rau hauv kev sib cuag los yog tawg cov thermocouple xov hlau.

Txoj kev pov thawj: luv luv cua sov qhov kev sojntsuam nrog lub sib zog (tsis txhob tshaj qhov ntau) thiab saib seb tus nqi millivolt nce linearly.

 

III. Kev Ntxuav thiab Hloov Kev Txiav Txim Siab Flowchart (Qhia)

Cov khoom soj ntsuam	Li qub	Kev tshwm sim txawv txav	Cov lus qhia kho mob
Kev tshuaj xyuas qhov tshwm sim	Tsis muaj kab nrib pleb, tsis muaj corrosion, tsis muaj deformation	Kev tiv thaiv tube perforation, dej nkag mus rau hauv lub thawv sib txuas	Hloov
Kev ntsuas ntsuas	Tsawg dua lossis sib npaug rau 2Ω (hom sib dhos)	>1kΩ los yog infinite	Hloov
Thermocouple Potential Measurement	Deviation Tsawg dua los yog sib npaug rau qhov yuam kev tso cai	Ntau dhau thiab irreversible deviation	Hloov
Rwb thaiv tsev Resistance	>100MΩ	<10MΩ	Hloov
Kub nce teb	linear hloov	Tsis hloov lossis dhia	Hloov
Nto Cov Kab Mob	Ntxuav thiab ci	Roj stains, carbon deposits	Ntxuav

 

IV. Kev Tiv Thaiv Kev Tiv Thaiv Cov Lus Qhia

Kev tu tsis tu ncua: Ntxuav lub ntsej muag ntawm cov thermocouples nyob rau hauv qhov chaw raug los yog muaj kab mob ntau heev txhua 1-3 lub hlis.

Kev ntsuas ib ntus: Ua rau ntawm -qhov chaw lossis offline calibration txhua 6-12 lub hlis txhawm rau kuaj xyuas qhov kev ua haujlwm tsis zoo. Tsim ib lub log hloov: Sau lub sijhawm teeb tsa, kev ua haujlwm, thiab keeb kwm tsis ua haujlwm. Ua ntej hloov pauv rau cov chaw uas tau siv ntau tshaj ob xyoos lossis muaj kev ua haujlwm tsis zoo.