Electromagnetic cuam tshuam (EMI) los ntawm cov cuab yeej txhaj tshuaj molding yog ib qho kev zais zais uas ua rau tsis ruaj tsis khov kub khiav thermocouple signals. Kev kuaj mob kom zoo thiab tshem tawm cov suab nrov yuav tsum tau tsom cov thaiv thaiv thaiv kab thiab kev ua kom zoo tshaj plaws.
Txheeb xyuas cov tsos mob suab nrov. Lub suab nrov tshwm sim raws li kev nyeem ntawv kub uas hloov pauv sai yam tsis muaj kev hloov pauv hauv lub tshuab rhaub hluav taws xob, kev nyeem ntawv dhia ntawm ob qhov tseem ceeb, lossis cov tswj uas nquag mus ncig lub tswb txawm tias cov txheej txheem ruaj khov. Yog tias qhov kev hloov pauv cuam tshuam nrog kev ua haujlwm ntawm lwm yam khoom siv- tus neeg hlau caj npab txav, lub cev muaj zog pib, lossis lub tshuab ua kom sov- qhov chaw yuav luag yog EMI.
Thawj Noise Sources. Electromagnetic cuam tshuam los ntawm cov cua sov cables yog qhov tseem ceeb. Qhov sib txawv zaus tsav ntawm cov chav txhaj tshuaj ua kom muaj suab nrov dav -spectrum. Siab- cov kab hluav taws xob tam sim no ua rau lub suab nrov 50/60 Hz thaum cov xov hlau thermocouple khiav mus rau lawv ntau dua 30 cm. Tsis zoo los yog puas hauv av kuj pab.
Shielded Cables yog Thawj Kev Tiv Thaiv. Shielded thermocouple cables yog cov tshuaj ncaj qha tshaj plaws rau EMI cuam tshuam. Siv cov kab hluav taws xob uas muaj kev tiv thaiv tag nrho, cais cov thermocouple thiab lub rhaub hluav taws xob, xyuas kom huv hauv av, siv cov khoom zoo siab - zoo, thiab zam cov cables puas. Kev tshuaj xyuas tsis tu ncua ntawm kev tiv thaiv hauv av thiab cov txheej txheem xaim tuaj yeem tshem tawm ntau dua 90% ntawm cov teeb meem suab nrov.
Separated Hlau Layout. Thermocouple teeb liab cables yuav tsum tau muab tso cais los ntawm siab -tam sim no lub rhaub fais fab cables nrog qhov sib nrug tshaj 30mm. Bundling teeb liab thiab fais fab hlau ua ke induces hnyav electromagnetic suab nrov thiab kub dhia nyeem ntawv. Siv cov kab hluav taws xob tshwj xeeb rau cov teeb liab thiab cov kab hluav taws xob.
Proper Shield Grounding. Shielded thermocouple braided cables yuav tsum tsuas yog av txheej thaiv ntawm qhov ntsuas kub kawg. Muab ob npaug rau- kawg grounding tsim av voj drift faults. Cov ntaub thaiv npog hlau muab kev tiv thaiv, thiab sib cais cov kab hluav taws xob thermocouple los ntawm siab - lub tshuab hluav taws xob siv hluav taws xob siv hluav taws xob tshwj xeeb txuas ntxiv txo kev cuam tshuam.
Isolated Inputs. Siv cov teeb liab sib cais los yog cov tswj ntsuas kub nrog cov tsim - nyob rau hauv kev sib cais los cuam tshuam kev cuam tshuam ntawm lub cev. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov thermocouples hauv av uas muaj kev cuam tshuam rau hauv av loops.
Kev laus Thermocouples. Hloov cov thermocouples aging los yog cov neeg tsis zoo. Xyuas kom tseeb tias cov ntsaws ruaj ruaj ruaj ruaj thiab tsis muaj oxidation. Ib qho degraded sensor yog qhov cuam tshuam rau lub suab nrov.
Tswj Filter. Tsim nyog kho thiab nce cov teeb liab digital filtering sab hauv parameter qhov tseem ceeb ntawm tus kub khiav PID kub tswj. Txawm li cas los xij, kev lim dej ntau dhau ua rau cov lus teb qeeb - nrhiav qhov sib npaug qhov chaw uas lub suab nrov raug tshem tawm yam tsis muaj kev cuam tshuam rau kev tswj ceev.
