Nyob rau hauv qhov kev sib tshuam txias?

2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38

In Summary Cold junction them nyiaj compensates for the missing thermoelectric voltage vim qhov tseeb tias lub thermocouple txias kawg ntawm qhov ntsuas tsis nyob ntawm (0 ° C / 32 ° F). Qhov no tom qab ntawd tso cai rau cov khoom siv hluav taws xob siv cov khoom siv hluav taws xob tsim hluav taws xob (lossis polynomials) los txiav txim qhov kub ntawm qhov kub kawg.

Vim li cas thiaj li yuav tsum tau them nyiaj txias txias?

Cold Junction Compensation (CJC) yog qhov tsim nyog thaum ntsuas qhov ntsuas kub siv cov thermocouples … thaiv lub davhlau ya nyob twg) kuj ntxiv qhov sib txawv ntawm qhov ntsuas qhov ntsuas kub.

Yuav ua li cas yog tias koj tsis ua qhov kev them nyiaj txias txias hauv lub tshuab hluav taws xob thermocouple?

Yuav ua li cas yog tias koj tsis ua qhov kev them nyiaj txias txias hauv lub thermocouple circuit? Kev nyeem ntawv kub yuav tsis raugvim tias koj tsis muaj txoj hauv kev los them nyiaj rau lub voj voog rau cov hluav taws xob hluav taws xob uas tsim los ntawm qhov sib txuas ntawm cov hlau sib txawv.

CJC yog dab tsi hauv thermocouple?

Kev ntsuas qhov ntsuas kub ib txwm xav tau cov ntaub ntawv los ntawm kev sib txuas xaim kawg (kub sib txuas) thiab qhib xaim kawg (txoj kev sib tshuam txias). Qhov chaw txias txias tseem hu ua qhov taw qhia siv. Kev hloov pauv ntawm qhov ntsuas qhov ntsuas kub tau them nrog CJC ntsuas ( Cold Junction Compensation).

Kuv yuav ua li cas them nyiaj txias txias?

E_emf=−S∆T=S(T_HOT − T_COLD), qhov twg:

1. E_{emf is the voltage output of the thermocouple.}
2. S yog qhov ntsuas kub ntawm cov khoom siv, hu ua Seebeck coefficient (Rau hom K thermocouple, qhov no yog kwv yees li 4.1 μV / ° C ntawm 0 ° C thiab 1000 ° C)
3. T_{COLD yog qhov ntsuas kub ntawm qhov txias txias.}