Yuav ua li cas xaiv qhov zoo pyrometer
degree ntawm qhov raug
Ntau qhov ntsuas kub ntawm cov ntsuas kub tsis kam muab ppm, ohm thiab / lossis kub specifications. Kev hloov pauv ntawm ohm lossis ppm mus rau qhov kub thiab txias nyob ntawm tus pas ntsuas kub siv. Rau kev sojntsuam uas yog 100Ω ntawm 0 C, {{10}}}001Ω(1mΩ) yog sib npaug rau 0.0025 degree lossis 2.5mK. 1ppm kuj sib npaug rau 0.1 mω lossis 0.25mK. Nws kuj tseem yuav tsum tau them sai sai rau seb qhov kev ntsuas kev ntsuas yog "nyeem" lossis "ntau". Piv txwv li, "1ppm nyeem ntawv" yog 0.1 mω ntawm 100ω, thaum "1ppm ntau" yog 0.4 mω ntawm 400ω. Qhov txawv yog loj heev!
Thaum kuaj xyuas cov kev ntsuas qhov tseeb, nws yuav tsum nco ntsoov tias qhov kev nyeem ntawv tsis paub meej muaj me ntsis cuam tshuam rau tag nrho qhov tsis paub tseeb ntawm qhov ntsuas ntsuas, thiab nws tsis yog ib txwm pheej yig los yuav tus ntsuas kub nrog qhov tsis paub tseeb qis tshaj. Txoj kev tsom xam ntawm "bridge-super resistance thermometer" yog ib qho piv txwv zoo. A 0.1-ppm tus choj raug nqi ntau dua $40,000, thaum lub ntsuas qhov ntsuas kub siab tshaj 1-ppm tus nqi qis dua $20,{{7} }. Saib rov qab ntawm tag nrho cov kev tsis meej pem, nws pom tseeb tias tus choj tsuas tuaj yeem txhim kho qhov kev ua tau zoo mus rau qhov me me-qhov no, nws yog 0.000006 C-thiab tus nqi siab heev.
kev ntsuas yuam kev
Thaum ua tiav qhov kev ntsuas qhov tseeb siab, nws yog ib qho tsim nyog los xyuas kom meej tias tus pas ntsuas kub tuaj yeem tshem tawm cov thermoelectric tej zaum yuav raug tsim los ntawm cov hlau sib txawv hauv qhov ntsuas qhov system. Ib qho txheej txheem los tshem tawm qhov yuam kev ntawm qhov hluav taws xob hluav taws xob hluav taws xob yog siv hloov DC lossis tsawg zaus AC tam sim no.
daws teeb meem ratio
Ceev faj txog qhov ntsuas no. Qee cov tuam txhab ntsuas ntsuas kub tsis sib haum xeeb thiab raug. Kev daws teeb meem ntawm {{0}}.001 degree tsis txhais tau tias qhov tseeb ntawm 0.001 degree . Feem ntau hais lus, tus pas ntsuas kub nrog qhov tseeb ntawm 0.001 degree yuav tsum muaj qhov kev daws teeb meem tsawg kawg yog 0.001 degree .. Thaum kuaj pom qhov ntsuas kub me me, qhov kev daws teeb meem ntawm cov zaub yog qhov tseem ceeb heev - piv txwv li, thaum saib xyuas qhov nkhaus nkhaus ntawm cov thawv ntim ruaj khov, lossis thaum kuaj xyuas qhov kev ruaj ntseg ntawm calibration tanks.
linearity
Cov tuam txhab ntsuas kub feem ntau muab cov ntsuas ntsuas qhov tseeb ntawm qhov ntsuas kub (feem ntau yog 0 C). Qhov no yog qhov tseem ceeb heev, tab sis feem ntau koj yuav tsum ntsuas qhov kub ntawm qhov dav, yog li nws tseem ceeb heev kom paub qhov tseeb ntawm tus pas ntsuas kub hauv qhov chaw ua haujlwm. Yog tias qhov linearity ntawm tus pas ntsuas kub zoo heev, nws qhov ntsuas qhov tseeb yog tib yam thoob plaws nws qhov kub thiab txias. Txawm li cas los xij, tag nrho cov ntsuas kub tsis yog linear rau qee qhov thiab tsis tag nrho linear. Thov nco ntsoov tias cov chaw tsim khoom muab qhov tseeb specifications nyob rau hauv qhov chaw ua hauj lwm los yog cov linearity specifications koj siv thaum xam qhov tsis paub tseeb.
ruaj khov
Vim tias nws yog qhov tsim nyog los ntsuas ntau yam ntawm ib puag ncig thiab ntau lub sijhawm ntev, kev nyeem ntawv ruaj khov yog qhov tseem ceeb heev. Nco ntsoov xyuas qhov kub coefficient thiab lub sij hawm ntev stability index. Xyuas kom meej tias qhov kev hloov ntawm ib puag ncig tej yam kev mob yuav tsis cuam tshuam qhov tseeb ntawm tus pas ntsuas kub. Reputable manufacturers muab qhov ntsuas kub coefficient. Cov ntsuas kev ruaj ntseg ntev yog qee zaum ua ke nrog cov ntsuas qhov tseeb-piv txwv li, "1ppm, 1 xyoo" lossis "0.01 degree , 90 hnub". Nws yog ib qho nyuaj rau calibrate txhua 90 hnub, yog li ib lub xyoo Performance index yuav tsum tau muab xam thiab siv rau kev ntsuam xyuas tsis meej. Ceev faj ntawm cov chaw muab kev pabcuam uas muab "0 drift" ntsuas. Txhua tus pas ntsuas kub yuav muaj tsawg kawg yog ib qho kev cuam tshuam.
calibrate
Qee qhov ntsuas kub tau teev tseg los ntawm kev ntsuas ntsuas raws li "tsis tas yuav rov ntsuas dua". Txawm li cas los xij, raws li daim ntawv qhia ISO tshiab, txhua yam khoom siv ntsuas yuav tsum tau ntsuas. Qee qhov ntsuas kub tau yooj yim dua rau recalibrate dua lwm tus. Siv lub ntsuas cua kub uas tuaj yeem ntsuas tau los ntawm nws lub vaj huam sib luag pem hauv ntej yam tsis muaj software tshwj xeeb. Qee cov ntsuas kub qub txuag cov ntaub ntawv ntsuas hauv EPROM nco thiab kev pab cuam nrog software kho. Qhov no txhais tau hais tias tus pas ntsuas kub yuav tsum raug xa mus rau cov chaw tsim khoom kom rov ua dua-tej zaum txawv teb chaws! Vim hais tias recalibration yog siv sij hawm heev thiab kim, nws yog ib qho tsim nyog yuav tsum tsis txhob siv lub ntsuas kub uas tseem hloov kho los ntawm phau ntawv qhia potentiometer. Feem ntau DC ntsuas kub yog ntsuas los ntawm cov txheej txheem DC tus qauv resistors nrog kev ruaj ntseg siab. Calibration ntawm AC tus pas ntsuas kub lossis tus choj yog qhov nyuaj dua, uas yuav tsum muaj kev siv inductive voltage divider thiab precision AC tus qauv resistor.
Traceability
Kev ntsuas traceability yog lwm lub tswv yim. Los ntawm cov qauv zoo DC tsis kam, qhov traceability ntawm DC tus pas ntsuas kub yog qhov yooj yim heev. Cov traceability ntawm AC tus pas ntsuas kub thiab tus choj yog qhov nyuaj dua. Ntau lub teb chaws tseem tsis tau muaj qhov tsim traceability ntawm AC tsis kam. Ntau lub teb chaws uas muaj cov qauv AC traceable cia siab rau AC resistors calibrated los ntawm tus pas ntsuas kub lossis cov txuas hniav uas nws qhov tsis paub meej yog kaum npaug ntau dua, uas yuav pom tseeb qhov kev ntsuas tsis meej ntawm tus choj nws tus kheej.
yooj yim
Kev siv zog los txhim kho cov khoom tsim tau yog qhov kawg. Yog li ntawd, koj yuav tsum tau siv tus pas ntsuas kub uas txuag lub sijhawm ntau li ntau tau.
Direct zaub ntawm qhov kub thiab txias-Ntau tus pas ntsuas kub tsuas tuaj yeem tso saib qhov qub tsis kam lossis qhov hluav taws xob. Qhov kub thiab txias yog qhov muaj txiaj ntsig zoo tshaj plaws, yog li siv lub ntsuas ntsuas kub uas tuaj yeem hloov qhov tsis kam lossis qhov hluav taws xob mus rau qhov kub thiab txias, thiab xyuas kom muaj ntau yam kev hloov pauv-ITS-90 hloov pauv mis rau SPRT, Callendarvan-Dusen hloov pauv mis rau kev lag luam PRT, thiab yog li ntawd.
Ntau hom kev tawm tswv yim-Koj tuaj yeem ntsuas ntau qhov ntsuas kub, suav nrog 3-hlau thiab 4-wire PRT, thermistors thiab thermocouples. Thermometers uas tuaj yeem ntsuas ntau hom kev tawm tswv yim tuaj yeem muab tus nqi zoo tshaj plaws thiab qhov yooj yim tshaj plaws.
Kawm nkhaus-siv tus pas ntsuas kub yooj yim thiab yooj yim siv. Tus choj tau siv ntau xyoo thiab tuaj yeem muab kev ntsuas kev ua tau zoo, tab sis nws xav tau kev nqis peev ntau hauv kev cob qhia kev ua haujlwm (thiab yuav tsum muaj lub khoos phis tawj sab nraud los ntsuas qhov ntsuas kub tau los ntawm cov resistor).
Multiplex hloov mus rau nthuav dav-Thaum lub calibration ua hauj lwm suav nrog qhov kub thiab txias tso tsheb hlau luam ntawm tib yam kev sojntsuam, cov khoom tsim tau kuj tuaj yeem txhim kho zoo heev yog tias qhov ntsuas ntsuas tau nthuav dav nrog multiplex hloov.
Digital interface-Yuav kom paub cov ntaub ntawv tsis siv neeg tau txais thiab ntsuas, lub computer interface yog qhov tseem ceeb. Tsis siv neeg calibration yog paub los ntawm kev siv RS-232 lossis IEEE-488 interface thiab calibration software uas tuaj yeem txuas nrog ntsuas kub lossis lwm yam khoom siv hauv lub cev (thermostatic da dej thiab multiplex hloov).
