Kev faib tshuaj thiab cov ntsiab cai ntawm kev sib tham kub

Cov kev sib xyaw ua ke xa tawm tau qhov zoo ntawm cov qauv yooj yim, cov tshuaj tiv thaiv zoo, cov khoom pov thawj loj, rov qab ua pov thawj kev tiv thaiv thiab kev tiv thaiv tam sim no, thiab kev ua haujlwm tsis yooj yim. Cov zis ntawm cov kev kub hloov kub hloov tshiab yog ib tug unified 4-20 ma teeb liab; Nws tuaj yeem siv nrog cov microcomputer system lossis lwm yam twj paj nruag. Nws tseem tuaj yeem ua rau hauv kev tawg-ntawv pov thawj lossis hluav taws kub-pov thawj ntsuas ntsuas raws li cov neeg siv.
Kev faib tshuaj thiab txoj ntsiab cai
Cov kev sib tham tau kub feem ntau muaj kev soj ntsuam kub (thermocouple lossis thermal resistor sensor) thiab ob-xaim hluav taws xob chav tsev. Qhov kub siab soj ntsuam tau ncaj qha ncaj qha rau hauv lub thawv hlws ris hauv daim ntawv ntawm ib tus qauv ruaj khov los ua cov khoom sib xyaw. Kev sib xyaw ua ke cov xov xwm hloov hluav taws xob feem ntau muab faib ua ob hom: thermocouple thiab thermal resistor.
Thermocouple cov xov tooj cua sov feem ntau muaj cov khoom siv hluav taws xob xws li siv, kev tiv thaiv linearized, rov qab kev kev sib txuas, thiab cov kev tiv thaiv tam sim no. Nws nthuav dav lub thermoelectric peev xwm tsim los ntawm thermocougle them nyiaj thiab tom qab ntawd nthuav dav thiab hloov nws mus rau hauv lub teeb meem. Txhawm rau tiv thaiv cov xwm txheej tshwm sim los ntawm kev ntsuas kub tsis ua haujlwm vim yog thermocouple ntsuas, lub transmitter kuj tseem nruab nrog lub zog tiv thaiv hluav taws xob. Thaum tus xov thermocouple tawg lossis qhov txuas tsis zoo, lub transmitter yuav tso tawm cov nqi siab tshaj plaws (28ma) txiav tawm lub zog hluav taws xob.
Lub thermal resistor kub xovxwm yog tsim ntawm R / V Hloov Siab Kev Tiv Thaiv, thiab tom qab cov kab ke sib txuas, thiab hloov dua tshiab} ma constant tus teeb liab tam sim no uas yog linearly hais txog kev ntsuas kub yog tso zis.