Lub thermocouple yog tsim los ntawm kev sib txuas ntawm ob qhov sib txawv conductors ua ke. Thaum ntsuas thiab siv junctions nyob ntawm qhov sib txawv ntawm qhov kub thiab txias, ib qho thermoelectric quab yuam (EMF) raug tsim. Qhov ntsuas qhov sib txuas yog ib feem ntawm qhov sib txuas ntawm cov thermocouple uas yog nyob ntawm qhov ntsuas kub. Cov kev sib txuas siv yog ib feem ntawm qhov sib txuas ntawm cov thermocouple uas tau tswj xyuas ntawm qhov kub thiab txias, lossis qhov kub hloov pauv tau txais kev them nyiaj.
Hauv cov ntawv thov kev lag luam, cov ntsiab lus thermocouple feem ntau raug txiav tawm ntawm qhov txuas; Txawm li cas los xij, qhov sib txuas siv tsis tshua muaj nyob ntawm qhov txuas, tab sis hloov mus rau qhov kub thiab txias -ib puag ncig tswj kev ruaj ntseg siv cov khoom siv thermocouple txuas ntxiv. Hom kev sib tshuam: Cov thermocouples hauv av muaj cov thermocouple hlws ris lub cev txuas nrog (welded) rau qhov kev sojntsuam sheath, tso cai rau kev hloov pauv kub zoo heev - uas yog, cua sov tau xa tawm sab nraud los ntawm kev sojntsuam sheath mus rau qhov sib txuas ntawm cov thermocouple. Grounded thermocouples raug pom zoo rau ntsuas qhov kub ntawm qhov zoo li qub lossis ntws corrosive gases thiab kua, nrog rau qee qhov kev siv siab -. Nyob rau hauv insulated thermocouples, lub thermocouple hlws ris yog sib cais los ntawm kev sojntsuam sheath thiab surrounded los ntawm ib tug mos hmoov. Txawm hais tias insulated thermocouples muaj lub sijhawm teb qeeb dua li cov thermocouples hauv av, lawv muab hluav taws xob rwb thaiv tsev.
Rwb thaiv tsev thermocouples raug pom zoo rau qhov chaw corrosive, qhov zoo tshaj plaws muab cov hluav taws xob sib cais ntawm cov thermocouple los ntawm ib puag ncig ib puag ncig los ntawm kev tiv thaiv sheath. Exposed junction thermocouples tso cai rau qhov kawg ntawm txoj kev sib txuas mus rau qhov chaw ib puag ncig. Hom no muab lub sijhawm teb zoo tshaj plaws tab sis tsuas yog txwv rau cov ntawv tsis yog-corrosive, tsis- phom sij, thiab tsis yog- cov ntawv thov siab. Lub sij hawm teb yog qhia raws li lub sij hawm tas mus li, txhais raws li lub sij hawm yuav tsum tau rau lub sensor hloov 63.2% nruab nrab ntawm cov nqi pib thiab zaum kawg nyob rau hauv ib puag ncig tswj. Cov thermocouples raug nthuav tawm muaj lub sijhawm teb ceev tshaj plaws, thiab qhov me me ntawm qhov kev sojntsuam sheath txoj kab uas hla, lub sijhawm teb sai dua, tab sis qhov qis dua qhov ntsuas qhov ntsuas qhov siab tshaj plaws. Extension Wires: Thermocouple extension wires yog ib khub ntawm cov xov hlau uas muaj cov yam ntxwv zoo ib yam li cov thermocouple uas lawv txuas nrog. Thaum sib txuas kom zoo, cov xov hlau txuas ntxiv hloov cov kev sib txuas siv los ntawm cov thermocouple mus rau lwm qhov kawg ntawm cov hlau, uas feem ntau yog nyob rau hauv ib puag ncig tswj. Thaum xaiv ib lub thermocouple, cov hauv qab no yuav tsum xav txog:
1. Qhov ntsuas kub yuav tsum tau ntsuas;
2. Lub sijhawm teb xav tau;
3. Hom kev sib txuas;
4. Cov tshuaj tiv thaiv corrosion ntawm cov khoom siv thermocouple lossis sheath;
5. Abrasion lossis kev co kuj;
6. Kev teeb tsa thiab kev txwv, thiab lwm yam.
