Yuav Ua Li Cas Yog tias Teflon -Sheathed Corrosion-Resistant Platinum Resistance Temperature Detector yog Faulty

Basic Resistance Value Test: Paub meej tias Platinum Core yog lawm

Siv lub siab -precision multimeter (nrog tsawg kawg 4-xaim teeb tsa kom tshem tawm cov hlau lead tsis raug) txhawm rau ntsuas qhov ntsuas qhov ntsuas kub ntawm platinum tiv thaiv qhov ntsuas kub (RTD, feem ntau Pt100 lossis Pt1000) ntawm qhov paub qhov ntsuas kub (piv txwv li, 0℃dej khov taw tes). Sib piv cov ntsuas ntsuas ncaj qha rau tus qauv IEC 60751 lossis DIN 43760 siv lub rooj / nkhaus rau qhov sib thooj. Ib qho kev sib txawv tseem ceeb dhau ntawm chav kawm kam rau ua (piv txwv li, ± 0.06 Ω rau Chav Kawm A ntawm 0 degree) qhia qhov txawv txav xws li kev puas tsuaj ntawm lub cev, xaim tawg, kev sib kis, lossis calibration drift.

 

Kub Point	Pt100 Nominal Resistance Tus nqi	Yam tsawg kawg nkaus (Qib B)	Kev Txiav Txim Abnormality
0 degree	100.00 Ω	99.70–100.30 Ω	<99.00 or >101.00 Ω → Platinum hlau tawg lossis kab mob
35 degree	113.57 Ω	113.00–114.10 Ω	<86.25 Ω → Short circuit or sheath leakage short circuit
100 degree	138.51 Ω	137.80–139.20 Ω	>177.68 Ω → Lead hlau qhib Circuit Court lossis kev sib cuag tsis zoo
205 degree	177.68 Ω	176.50–178.80 Ω	Infinite kuj → Internal qhib Circuit Court

Lub hauv paus: Schneider Electric's fault threshold txhais rau PT100 (<35℃ considered short circuit, >205℃suav tias yog qhib Circuit Court).

II. Rwb thaiv tsev Resistance Testing: Ntsuam xyuas kev ncaj ncees ntawm kev tiv thaiv Sheath Corrosion

Siv lub megohmmeter (500V DC) los ntsuas qhov rwb thaiv tsev ntawm qhov kev sojntsuam cov hlau casing thiab cov hlau lead:

Txais Cov Qauv: Ntau dua lossis sib npaug rau 100 MΩ (ua raws li IEC 60751: 2022)

Ceeb Toom: 1–10 MΩ → Moisture intrusion lossis deg paug

Kev Txiav Txim Siab:<1 MΩ → Sheath penetration, dielectric seepage leading to ground short circuit

Yog tias cov rwb thaiv tsev tiv thaiv poob qis, txawm tias tus nqi tiv thaiv zoo li qub, nws qhia tau tias cov txheej txheem tiv thaiv corrosion tau ua tsis tiav thiab yuav tsum tau hloov tam sim ntawd; txwv tsis pub, nws yuav ua rau kev ntsuas tsis tu ncua.

III. Sheath Integrity Inspection: Txheeb xyuas Microscopic puas

Use a 12kV spark leak detector to scan the sheath surface to detect the presence of micropores or cracks invisible to the naked eye:

Lub xeev ib txwm: Tsis muaj hluav taws xob tawm

Lub xeev txawv txav: Nruam los yog cuam tshuam lub txim tawm → Muaj qhov nkag mus

Txoj kev no yog ib qho kev sim uas tsis yog -kev puas tsuaj thiab raug pom zoo kom ua txhua 6-12 lub hlis, tshwj xeeb tshaj yog tom qab muaj zog corrosion los yog siab - cov dej ntws tawm.

IV. Temperature Response Characteristics Analysis: Eliminating System Interference

Muab lub sensor tso rau hauv lub da dej kub tas li thiab sau nws qhov kev tiv thaiv tiv thaiv qhov kub thiab txias:

Teb zoo li qub: Kev tiv thaiv-qhov kub thiab txias qhia tau hais tias qhov sib npaug sib npaug, ua raws li Daim Ntawv Teev Npe -Van Dusen equation.

Kev ua haujlwm tsis zoo:

Curve qhia "cov kauj ruam" lossis "glitches" → Kev sib cuag tsis zoo lossis cov hlau lead oxidation

Slow response (>5s kom stabilize) → Moisture nyob rau hauv lub muab tub lim los yog impaired thermal conduction

Deviation from standard value >± 0.5℃→ Platinum hlau aging lossis calibration tsis ua hauj lwm

Kev cuam tshuam ntawm cov hlau lead tiv thaiv tuaj yeem raug tshem tawm los ntawm kev sib txuas peb - txoj kev xaim hlau los xyuas kom meej qhov ntsuas qhov tseeb.

V. Cov cuab yeej tseem ceeb pom zoo

Table Tool Lub Hom Phiaj Pom Zoo Tus Qauv Piv Txwv

Digital Multimeter Ntsuas Qhov Ntsuas Tus Nqi Fluke 87V

Megohmmeter Test Insulation Resistance CA6545, Fluke 1535

Spark Leak Detector Detecting Micropores hauv Sheath Diskerry D1, JA-5

Thermostatic Bath Calibrating Temperature Teb 0.01℃Accuracy Dej Da Dej

Cov Lus Qhia Ua Haujlwm: Txhua qhov kev ntsuam xyuas yuav tsum tau ua nyob rau hauv lub zog -tawm, ib puag ncig qhuav kom tsis txhob muaj kev puas tsuaj los ntawm kev ua haujlwm nyob.