Yuav Ua Li Cas Thermocouple Accuracy Qib cuam tshuam rau Molding Txheej Txheem Kev ruaj ntseg?

Qib raug ntawm cov thermocouple tsis yog ib qho kev qhia tshwj xeeb ntawm daim ntawv teev lus nkaus xwb- nws ncaj qha txiav txim siab qhov ruaj khov thiab rov ua dua ntawm cov txheej txheem txhaj tshuaj molding. Raws li IEC 60584, thermocouples raug faib ua cov chav kawm kam rau ua, nrog rau Chav Kawm 1 yog qhov siab tshaj plaws rau kev siv dav dav. Rau Hom K, Chav Kawm 1 tso cai rau kev ua siab ntev ntawm ± 1.5℃los ntawm -40℃rau +375℃, thiab ± 0.004 ×|t| siab tshaj 375 degree. Chav 2 tso cai ± 2.5℃thiab ± 0.0075 ×|t|, raws li. Qhov kev sib txawv no yuav zoo li tsis tsim nyog, tab sis hauv kev xyaum nws txhais tau tias muaj ntau yam kev hloov pauv. Xav txog qhov chaw kub kub tau teem rau 250℃rau polycarbonate molding. Ib chav kawm 2 thermocouple tuaj yeem nyeem qhov twg los ntawm 247.5℃mus rau 252.5℃thaum tus tswj ntseeg tias nws nyob ntawm 250 degree. Yog hais tias qhov tseeb melting kub yog 252.5 degree, lub viscosity poob, ua rau flash thiab seem shrinkage. Yog tias nws yog 247.5 degree, cov yaj yuav ua kom khov, ua rau muaj kev txhaj tshuaj luv luv lossis txhaj tshuaj siab. Hauv ntau-kab kab noj hniav pwm, siv Chav Kawm 2 sensors hla thaj chaw sib txawv txhais tau tias txhua cheeb tsam yuav ua haujlwm ntawm qhov sib txawv ntawm qhov tseeb me ntsis, ua rau qhov hnyav thiab qhov sib txawv ntawm cov kab noj hniav. Chav Kawm 1 thermocouples, nrog rau lawv qhov kev ua siab ntev dua, txo qhov tsis paub tseeb. Tsis tas li ntawd, lub drift dhau lub sij hawm ntxiv widens lub zoo kam rau ua. A Class 1 sensor uas drifts +0.5℃nyob rau ib xyoo tseem nyob rau hauv nws cov chav kawm txwv, tab sis ib tug Class 2 sensor drifting tib tus nqi yuav mus txog ntawm ntug ntawm nws kam rau ua. Yog li ntawd, rau siab -kev siv precision-automotive kev nyab xeeb qhov chaw, cov khoom siv kho mob, thiab cov khoom siv kho qhov muag-Class 1 lossis txawm tias tshwj xeeb kam rau ua (± 0.5 degree) thermocouples yog qhov yuav tsum tau ua. Rau kev ntim khoom lossis cov khoom siv, Chav Kawm 2 yuav txaus, tab sis tus txheej txheem engineer yuav tsum suav rau qhov muaj peev xwm hloov pauv. Calibration intervals kuj nyob ntawm qib; Class 1 sensors feem ntau xav tau kev ntsuas txhua xyoo kom muaj ntawv pov thawj, thaum Chav Kawm 2 yuav raug tshuaj xyuas tsawg dua. Thaum muas cov thermocouples, nco ntsoov thov daim ntawv pov thawj calibration tiag tiag uas qhia qhov sib txawv ntawm qhov kev ua haujlwm kub, tsis yog qhov ntsuas hauv chav kawm xwb. Qee cov neeg muag khoom muab "muab sib luag" cov teeb tsa uas qhov sib txawv ntawm txhua qhov thermocouples nyob rau hauv ib qho kev sib txuam -zone system nyob rau hauv ± 0.5℃ntawm ib leeg, xyuas kom meej tias txhua cheeb tsam nyeem tsis tu ncua txawm tias qhov tseeb tsis zoo tag nrho. Qhov no yog tus nqi -txoj kev ua tau zoo kom ua tiav cov kab noj hniav- rau-cavity uniformity. Hauv cov ntsiab lus, xaiv cov qib raug yog qhov kev txiav txim siab zoo uas sib npaug tus nqi thiab qhov zoo. Kev siv qib siab dua li qhov tsim nyog yuav ua rau tus nqi nce siab, tab sis kev txuag nyiaj los ntawm kev txo qis thiab cov teeb meem tsis zoo feem ntau ua rau kev nqis peev. Kev nkag siab txog cov chav kawm kam rau ua rau cov engineers los txheeb xyuas cov sensors uas ua tau raws li qhov xav tau tiag tiag ntawm lawv cov txheej txheem, tsis yog qhov kev xaiv ua ntej.