Kev hloov pauv ntawm RTD teeb liab mus rau qhov ntsuas kub uas siv lub multimeter
Ob qho tib si feem ntau siv pointer multimeters thiab digital multimeters tuaj yeem kwv yees kwv yees qhov ntsuas kub ntawm cov thermal resistor.
Cov thermal resistors feem ntau suav nrog (P platinum resistors) Pt100, Pt1000, thiab (C tooj liab resistors) Cu50, Cu100.
Kev ntsuas ntau ntawm Pt100 thermal kuj yog -200~ 850 degree, nrog qhov tsawg kawg nkaus ntawm 50 degree, qhov yuam kev tsis txaus ntawm ± 0.2 degree, thiab qhov yuam kev yooj yim ntawm ± 0.1 %. Kev ntsuas ntau ntawm Pt1000 platinum resistor tsuas yog -200 ~ 250 degree, thiab lwm yam tsis zoo ib yam li Pt100.
Kev ntsuas ntau ntawm Cu50 thiab Cu100 yog -50 ~ 150 degree, nrog qhov tsawg kawg nkaus ntawm 50 degree, qhov yuam kev ntawm ± 0.4 degree, thiab qhov yuam kev ntawm ± 0.1%.
Cia peb tham txog PT100 thermistor hauv qab no.
Pt100 tsuas yog ib qho kev nrhiav tau thiab nrhiav kom pom, uas yuav tsum tau nruab nrog ib qho kev pab cuam 5V ~ 24V DC ib qho hluav taws xob thaum ua haujlwm. Siv lub hauv paus ntsiab lus ntawm Wheatstone choj, cov teeb liab hluav taws xob uas sib txawv ntawm qhov sib txawv yog xa mus rau qhov sib xyaw ua haujlwm amplifier thaiv lossis cov khoom sib cais, thiab ua tiav los ntawm ib lub nti nti kom muaj kev cuam tshuam txog qhov ntsuas kub ntawm cov khoom ntsuas. Tus tswj qhov kub thiab txias teeb meem cov lus txib los tswj qhov kub ntawm cov khoom tswj.
Feem ntau siv PT100 thermistor muab faib ua ob lub xaim, peb xaim, thiab plaub lub tshuab hluav taws xob. Los ntawm nws qhov ntsuas, nws tuaj yeem pom tau tias nws qhov ntsuas qhov ntau yog qhov loj, txij li ntawm -200 degree mus rau +600 degree .
Lub npe hu ua PT100 tiag tiag yog hais txog nws tus nqi tsis kam ntawm 100 Ω (ohms) ntawm tus qauv 0 degree . Thiab raws li qhov kub thiab txias poob qis dua xoom, nws cov nqi kuj maj mam txo. Tus nqi tsis kam ntawm -200 degree yog li 18.5 Ω. Thiab thaum qhov kub nce ntawm 0 degree, nws cov nqi kuj nce. Piv txwv li, thaum kub nce los ntawm 50 degree, nws cov nqi kuj yog hais txog 119 Ω (ohms). Ntawm 100 degree, nws tus nqi kuj yog hais txog 138 Ω (ohms). Ntawm 200 degree, nws kuj yog hais txog 176 Ω (ohms), thiab ntawm 600 degree, nws kuj yog hais txog 313 Ω (ohms).
Raws li tau hais los saum no, Cu50 thermistor tuaj yeem muab tau, qhov twg 50 Ω yog hais txog nws tus nqi tsis kam ntawm 0 degree . Thaum nws nyob ntawm -50 degree, nws tus nqi kuj yuav txo los ntawm 50 Ω mus rau 39.2 Ω. Thaum nws nce ntawm 0 degree mus rau 50 degree, nws cov nqi kuj yuav nce mus rau 60.7 Ω, thiab lwm yam. Ntawm 150 degree, nws tus nqi kuj yuav nce mus rau 82.13 Ω.
Los ntawm cov saum toj no, nws tuaj yeem pom tau tias ob qho tib si PT100 thermistor thiab Cu50 thermistor muaj qhov sib txawv loj thiab txoj cai tawm tsam. Thaum lawv raug xa mus rau ntau hom kev tswj qhov kub thiab txias kom ua tiav qhov kub thiab txias, cov nyhuv yog qhov zoo. Yog li ntawd, nws yog dav siv nyob rau hauv high-precision kub khoom xws li kev kho mob, kev tsim lub cev muaj zog, txias cia, industrial tswj, kub xam, choj kuj xam, thiab lwm yam, nrog rau ntau yam kev siv.
Txhawm rau kom yooj yim ntawm txhua tus neeg siv lub tshuab ntsuas ntau los kuaj xyuas ob hom thermal resistors, Pt100 thiab Cu50, cov hauv qab no yog cov lus teev rau kev tsim ob hom thermal resistors rau kev sib piv thiab kev sim.
