Ntawm Kev Ntxuav Cov Thermocouples

Qhov tseeb ntawm armored thermocouples, raws li kev sib cuag raws li ntsuas kub ntsuas, cuam tshuam ncaj qha rau qhov tseeb ntawm qhov ntsuas kub. Rau cov thermocouples hauv kev siv, vim qhov muaj peev xwm ntawm oxidation, corrosion, thiab paug ntawm qhov ntsuas kawg, nrog rau kev hloov pauv ntawm cov khoom siv hluav taws xob los ntawm kev rov tsim cov ntaub ntawv kub electrode nyob rau hauv qhov kub thiab txias, qhov ntsuas kub yuav tsum tau ua. Yog li ntawd, ua ntej lub sij hawm calibration, sib sau ua ke thermocouples yuav tsum tau ntxuav kom tshem tawm impurities uas paug electrode nto, txhim kho lawv cov thermoelectric kev ua tau zoo, thiab ntev lawv lub neej kev pab cuam. Raws li kev paub dhau los ntawm kev ua haujlwm ntau xyoo, tham txog kev tu cov txheej txheem thermocouples. Kev ntxuav ntawm cov thermocouples yog ua nyob rau hauv ob kauj ruam: ntxuav cov kua qaub thiab sib tov ntxuav.
1. Pickling
Lub hom phiaj ntawm pickling yog siv lub peev xwm oxidizing ntawm cov kua qaub kom tshem tawm cov organic teeb meem thiab cov hlau impurities los ntawm qhov chaw ntawm lub thermoelectric electrode. Cov txheej txheem yog raws li nram no: tso lub thermoelectric electrode nyob rau hauv ib lub voj voog loj tshaj 80 millimeters nyob rau hauv lub beaker, yaug nws nrog distilled dej ib zaug kom tshem tawm cov plua plav saum npoo, ces tsau rau hauv 30-50% (los ntawm ntim) tshuaj ntshiab dilute nitric. acid (los yog dilute hydrochloric acid) rau ib teev los yog boil rau 15 feeb (nitric acid tsis yooj yim rau boil), ces yaug nws ob peb zaug nrog distilled dej thiab boil nws kom tshem tawm acidity.
2. Borax ntxuav
Borax yog ib tug zoo purifying tus neeg sawv cev uas yuav tshem tawm cov hlau impurities thiab oxides uas nyuaj rau yaj nyob rau hauv cov kua qaub uas txuas mus rau electrode nto. Cov txheej txheem tshwj xeeb yog raws li hauv qab no: straighten lub thermocouple nrog anhydrous cawv paj rwb, dai qhov kawg siv ntawm ob lub electrodes kub ntawm qhov ntxuav annealing khib, lub kaum sab xis ntawm ob lub electrodes kub yog 300, thiab tom qab ntawd kho Tam sim no, Kub lub thermocouple mus rau 1100 (thaum ntsuas nws qhov kub thiab txias nrog lub optical pyrometer, qhov ci ntsa iab ntawm platinum electrode yog li 10001050FC. Kub lub platinum hlau nrog txoj kab uas hla ntawm 0.5 millimeters rau saum toj no kub, thiab tam sim no txog 105. A. Kov rau sab saum toj kawg nkaus nrog me ntsis borax kom yaj cov boron rau hauv cov tee dej thiab ntws los ntawm cov electrode, rov ua cov txheej txheem no ntau zaus kom txog thaum lub tshuab hluav taws xob hluav taws xob tso tawm lub teeb. yaug thiab boil nrog dej distilled ob peb zaug kom tiav cov xuab zeb ntawm electrode.