Sklic temperatura za termoelemente

Thermocouple cold junction temperature, also known as cold junction reference temperature, cold junction temperature, or reference temperature. As a thermocouple itself, it is a component that responds to temperature differences, and its millivolt value is only related to the temperature difference between the cold and hot ends. If one end is 100 degree and the other end is 20 degree , then the millivolt value generated by the thermocouple itself only corresponds to 80 degree . When used for temperature measurement, such as measuring an object at 100 degree in an environment of 20 degree , and obtaining a millivolt value corresponding to 80 degree , the temperature of the measured object can be obtained by adding 20 degree of the environment. This 20 degree (ambient temperature) is the reference temperature for the cold end. The vast majority of temperature measurement surfaces can automatically detect the cold end temperature, and automatically add it, which is called automatic cold end compensation. But he becomes redundant when checking the watch, so automatic cold end compensation should be closed or manually corrected when checking the watch.
The termoelektrični potencial of a termočlen je povezan do material od teroelektrična elektroda in temperatura of dve stikov. The Tabela oddelek of termoelementov in temperatura merilnik umerjeno v skladu z to the oddelek tabela so oboje osnova na the pogoj to the temperatura at na the referenčni konec of termoelement is ena do {{{{{0}}}} stopinja , so mi mora skladno z to stanje kdaj uporaba njih. If the reference temperatura tn is ne ena 0 stopinja , čeprav izmerjena temperatura t ostane konstantna, the termoelektrična potencialna E (t, tn) volja tudi sprememba z sprememba of referenca temperatura tn.
Za primer, we vstavi a nikelj krom nikelj silicij termočlen v a a 600 stopinja ceva električni peč, kdaj referenčni konec temperatura of termoelement is 7b{8}}}} izhod termoelektrični potencialni is 24,91 milivolti; If the reference temperatura is 30 stopinja 2c termoelektrična potencialna izhodna z the termočlen pade to 23. 74 milivolti, kar je the meritev napaka uvedeno kdaj sklic temperatura is ne ne enako do 0 stopinja . If the reference temperatura spremembe, the uvedeno meritev napaka bo be spremenljivka. It can be vidno to kdaj sklic konec temperatura ni ne ne ena do 0 stopinja , IT has zelo pomembno Vpliv na na natančnost The Izmerjena temperatura Ni Ne Enakovredno do 0 Stopnja 2C IT has zelo Pomembno Vpliv na Natančnost Od Izmerjeno Temperaturo.
Kdaj uporaba termoelementi za temperatura meritve, it je težko vzdrževati the reference konec temperatura at 0} stopinja , in it je na splošno samo potrebno za natančnost meritve v the laboratoriju. V splošno inženiring meritve, the reference temperatura je je večinoma at sobna temperatura ali nihajoča temperatura območje. At this point, in vrsta meriti dejansko temperaturo, meritve takšno kot popravek or Odškodnina mora BE VZETO.