Dab tsi yog qhov txawv ntawm qhov kub thiab txias ntsuas hluav taws xob tiv thaiv thiab thermocouple

Qhov sib txawv ntawm thermocouples thiab thermal resesors

1. Cov paib teeb meem: thermal resistors yog tsim. Thermal resistor Kev ntsuas hluav taws xob ua haujlwm raws li lub hauv paus ntsiab lus uas cov tshuaj tiv thaiv ntawm cov hlau hloov nrog qhov kub. Thermocoples: Weld ob lub xov hlau lossis semiconductors ntawm cov khoom sib txawv ua ke los ua lub voj kaw. Thaum muaj qhov sib txawv ntawm ob qho kev sib txawv ntawm cov xaim, hluav taws xob hluav taws xob yog tsim ntawm ob, yog li sib sau ua ib qho loj ntawm lub voj. Qhov tshwm sim no hu ua cov nyhuv thermoelectric nyhuv. Thermocouples ua haujlwm los ntawm kev siv cov nyhuv no.

2. Qhov kub kub tau pom los ntawm ob sensors: thermal resistors feem ntau ntes tau ib qho ntsuas kub ntawm {1}} degrees (lossis siab dua).

3. Cov khoom siv tus nqi: Thermal resistors yog cov khoom siv hlau nrog kev hloov pauv kub. Thermal tsim tawm cov paib tiv thaiv, thiab lawv cov zis yog tus nqi tiv (ω), yam tsis muaj tus qauv thiab tsis zoo. Cov siv feem ntau yog PT100 thiab CU50. Cov. Thermocouples yog cov ntaub ntawv bimetallic, uas yog, ob cov ntaub ntawv hlau sib txawv. Vim tias cov kev hloov hauv qhov ntsuas kub, hluav taws xob muaj peev xwm tsim muaj nyob ntawm ob qho kawg ntawm ob lub xov hlau sib txawv. Nws tuaj yeem muab faib ua k, s, e, r, t, n thiab lwm cov lej ua haujlwm sib txawv thiab ntsuas kub. Therocouples yog voltage cim, thiab cov zis yog millivolts (MV), nrog tus qauv zoo thiab tsis zoo thiab tsis zoo. Qee tus kim dua li resistors, thiab qee tus yog pheej yig dua resistors yog siab kawg thaum muaj cov hlau them. Dab tsi yog qhov txawv ntawm qhov kub thiab txias ntsuas hluav taws xob thermal thiab thermoounce?

4. Kev sib raug zoo nrog PLC: Cov lus tawm tswv yim ntawm thermal resistors thiab thermoounce sib haum rau PLC kuj txawv. Cov kab lus no zoo, tab sis feem ntau PLCS tau txuas nrog 4 ~ 20ma cov cim, thaum thermal resistors thiab thermal resistors thiab thermal resistors thiab thermal instectors thiab thermal resistors thiab thermal resectors thiab thermal resistors thiab thermal resectors thiab thermal intors thiab thermal resectors thiab thermal intors thiab thermal resectors thiab thermal intors thiab thermal resors thiab thermal resectors thiab thermal resistors thiab thermal resistors thiab thermal resistors yog feem ntau txuas nrog transcs nrog transmitters. Yog tias koj txuas rau DCS, koj tsis tas yuav siv lub tshuab xa khoom. Tus thermistor yog RTD teeb liab, thermocouple yog TC lub cim! (PLC kuj muaj thermal resistor module thiab thermocouple module, uas tuaj yeem ncaj qha cov tswv yim tsis kam thiab thermocouple teeb liab.

Qhov ntsuas kub ntsuas qhov tseem ceeb ntawm thermal resistor txawv ntawm qhov thermocouple.

Tus thermistor yog raws li cov thermal nyhuv ntawm resistor rau cov ntsuas kub, uas yog, qhov tsis kam ntawm resistor hloov nrog kev hloov ntawm kub. Yog li ntawd, ntev li ntev tau hloov pauv ntawm qhov kub-rhiab thermal resistor yog ntsuas, qhov ntsuas kub tau ntsuas. Tam sim no, muaj ob hom hlau thermal resistor thiab semiconductor tus kws kho cua nab.

Cov tsis kam lees thiab qhov kub ntawm cov hlau thermal resistor tuaj yeem qhia los ntawm kev sib raug zoo hauv qab no, uas yog,

Rt {{{{0}} rt {}} [1+}}}}} с (T-T0)]

Qhov twg rt yog cov tsis kam nqi ntawm qhov kub t; Rt {{{{{0}}}} yog cov tshuaj tiv thaiv tus nqi tiv thaiv ntawm T0 (feem ntau yog {2}} degree); α yog cov ntsuas kub.

Kev sib txheeb ntawm kev tiv thaiv tus nqi cuam tshuam thiab kub ntawm semiconductor thermistor yog

Rt=AB / T

Qhov twg rt yog cov tsis kam nqi ntawm qhov kub t; A thiab B vam khom cov semiconductor qhov tsis tu ncua ntawm cov qauv ntawm cov khoom.

Hauv kev sib piv, ntsuas kub coefficient ntawm cov cua nab loj dua, thiab qhov ntsuas kub yog ntau dua (feem ntau yog ntau dua li {}} ~ 300 degree. Nws yog dav siv nyob rau hauv qhov kub thiab txias thiab tswj cov khoom siv hauv tsev thiab tsheb. Hlau Thermal Cov Tub Rog feem ntau haum haum rau kev ntsuas kub nyob rau hauv ntau ntawm {2}} ~ 500 degree. Lawv tau cim los ntawm kev ntsuas yog, ruaj khov zoo, thiab kev ua tau zoo. Lawv siv dav hauv cov txheej txheem tswj.

Los ntawm qhov kev hloov pauv ntawm kev hloov pauv ntawm qhov kub, feem ntau hlau cov khoom muaj cov cuab yeej no, tab sis tsis yog txhua tus ntawm lawv tuaj yeem siv ntsuas ntsuas ntsuas ntsuas ntsuas kub ntsuas cua sov. Cov ntaub ntawv hlau siv ua thermal resistors feem ntau yuav tsum: cov khoom loj thiab ruaj khov kho kom zoo li qub Yuav tsum muaj cov nqi nruab nrab muaj nuj nqi ua haujlwm (txoj kev sib raug zoo linear zoo).